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Journal articles on the topic 'X-factor universe'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Krivonos, Roman A., and Mikhail G. Revnivtsev. "The X-Ray AGN Bias Factor at Zero Redshift." Proceedings of the International Astronomical Union 5, S267 (2009): 462. http://dx.doi.org/10.1017/s1743921310007040.

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AbstractUsing an AGN sample from the INTEGRAL all-sky survey, we show that the density fluctuations of matter in the local universe translate linearly into the density fluctuations of accreting supermassive black holes. Our results imply that hard X-ray emitting AGNs are unbiased tracers of the galaxy population in the nearby universe and SMBH activity is independent of the density of galaxies.

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Marčinskas, Albinas, and Daumantas Matonis. "Value Oriented Quality Strategy under Uncertain Conditions." Business: Theory and Practice 12, no. (3) (2011): 286–95. https://doi.org/10.3846/btp.2011.29.

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The authors of the article established the goal to evaluate the possibilities for strengthening the value orientation in the organization towards key success drivers which form a framework of X-factor universe. For this purpose exploration of the valuation on the success drivers as values was made. The authors used method of sociological enquiry of industrial enterprise personnel. The demand to increase valuations on the key success drivers of X-factor universe as determinants of organization perspective was proved after the investigation. Exploration showed differences of value system among v

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OHKUWA, YOSHIAKI. "THIRD QUANTIZATION OF KALUZA–KLEIN COSMOLOGY AND COMPACTIFICATION." International Journal of Modern Physics A 13, no. 23 (1998): 4091–100. http://dx.doi.org/10.1142/s0217751x98001918.

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We study on the third quantization of a Kaluza–Klein toy model. In this model time (x) is defined by the scale factor of universe, and the space coordinate (y) is defined by the ratio of the scales of the ordinary space and the internal space. We calculate the number density of the universes created from nothing and examine whether the compactification can be explained statistically by the idea of the third quantization.

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White, N. E., and H. Tananbaum. "The Constellation X-ray Mission." Symposium - International Astronomical Union 195 (2000): 61–68. http://dx.doi.org/10.1017/s0074180900162783.

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The Constellation-X mission is a large collecting-area X-ray facility emphasizing observations at high spectral resolution (E/ΔE ~ 300–3000) while covering a broad energy band (0.25–40 keV). By increasing the telescope aperture and utilizing efficient spectrometers, the mission will achieve a factor of 100 increased sensitivity over current high-resolution X-ray spectroscopy missions. The use of focusing optics across the 10–40 keV band will provide a similar factor of 100 increased sensitivity in this band. When observations commence in ~ 2008, Constellation-X will address many pressing quest

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Czachor, Marek. "Cosmic-Time Quantum Mechanics and the Passage-of-Time Problem." Universe 9, no. 4 (2023): 188. http://dx.doi.org/10.3390/universe9040188.

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A new dynamical paradigm merging quantum dynamics with cosmology is discussed. We distinguish between a universe and its background space-time. The universe here is the subset of space-time defined by Ψτ(x)≠0, where Ψτ(x) is a solution of a Schrödinger equation, x is a point in n-dimensional Minkowski space, and τ≥0 is a dimensionless ‘cosmic-time’ evolution parameter. We derive the form of the Schrödinger equation and show that an empty universe is described by a Ψτ(x) that propagates towards the future inside some future-cone V+. The resulting dynamical semigroup is unitary, i.e., ∫V+d4x|Ψτ(

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Lacombe, Osmin, та Shinji Mukohyama. "Self-tuning of the cosmological constant in brane-worlds with P(X,ϕ)". Journal of Cosmology and Astroparticle Physics 2022, № 10 (2022): 014. http://dx.doi.org/10.1088/1475-7516/2022/10/014.

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Abstract We revisit the idea of self-tuning the observed cosmological constant to a vanishing value and promote it to a selection criterion of brane-world models, in which our Universe is described by a 3-brane embedded in a 5d bulk. As a concrete setup, we consider a bulk scalar field ϕ described by a general Lagrangian P(X,ϕ) with X = -(∂ϕ)2/2. By requiring that the model enforces the 4d curvature of the maximally symmetric 3-brane world-volume to vanish independently of the 4d effective vacuum energy, only two possibilities remain: one with a canonical bulk kinetic term and the other with a

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Yang, Rong-Jia, Shuang Nan Zhang, Bohai Chen, and Jing-Zhao Qi. "An Old Universe in K-Essence Cosmology." ISRN Astronomy and Astrophysics 2011 (January 9, 2011): 1–5. http://dx.doi.org/10.5402/2011/523617.

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Models in which the Lagrangian contains only a kinetic factor and does not depend explicitly on the field itself in k-essence cosmology are considered. In the case of a constant potential, we obtain an exact analytic solution of k-essence, wk=−(3α−2)/3α, under a simple hypothesis, a=a0(t/t0)α, but without any assumption about the form of F(X). In purely kinetic k-essence model, the acceleration can only be induced after the matter-dominated epoch; the Universe is about 33.5−3.4+4.2 Gyr old now and about 3.1 Gyr old at z=3.9 which is consistent with the fact of quasar observation, while this ob

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Makino, Nobuyoshi, and Yasushi Suto. "X-Ray Gas Mass Fraction in the Shapley Supercluster and Its Implication on the Cosmological Baryon-Density Parameter." Publications of the Astronomical Society of Japan 45, no. 2 (1993): L13—L19. https://doi.org/10.1093/pasj/45.2.l13.

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Abstract We estimated the X-ray gas mass of the clusters in the Shapley Supercluster by improving a previous estimate based on the extrapolation from the Coma data. Assuming that the stellar mass in clusters amounts to 25% of that of the gas mass, the total baryon mass in the Shapley Supercluster is 0.48-1.3×1015h50-2.5M⊙ within 37h50-1 Mpc from the center of the Supercluster (h50 is the Hubble constant in units of 50 km s–1 Mpc–1). Our estimate of the X-ray gas mass in the Shapley Supercluster, which depends on h50 and β (a power-law index characterizing the gas density profile around a clust

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F Crawford, David. "Diffuse Background X Rays and the Density of the Intergalactic Medium." Australian Journal of Physics 40, no. 3 (1987): 459. http://dx.doi.org/10.1071/ph870459.

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Most of the 3-300 keY spectrum of the unresolved X-ray background can be explained as thermal bremsstrahlung from a hot intergalactic gas plus a small non-thermal component at higher energies. The model used assumes a static Universe with an exponential redshift with distance relationship that is due to photon interactions with curved space-time. The interglactic gas is found to have a temperature of 1 �3 x 109 K and a density of 2.05 C - 213 hydrogen atoms m - 3, where C is an unknown factor that depends on the dumpiness of the intergalactic gas.

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Dimitrijevic, Ivan, Branko Dragovich, Zoran Rakic, and Jelena Stankovic. "On nonlocal gravity with constant scalar curvature." Publications de l'Institut Math?matique (Belgrade) 103, no. 117 (2018): 53–59. http://dx.doi.org/10.2298/pim1817053d.

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A class of nonlocal gravity models, where nonlocal term contains an analytic function of the d?Alembert operator _, is considered. For simplicity, these models are considered without matter sector. Related equations of motion for gravitational field g??(x) are presented and analyzed for a constant scalar curvature R. The corresponding solutions for the cosmological scale factor a(t) of the FLRW universe are found and discussed.

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Mukherjee, Somnath. "NON-CANONICAL TO CANONICAL K-ESSENCE AND ACCELERATED EXPANSION OF THE UNIVERSE." Journal of Mathematical Sciences & Computational Mathematics 2, no. 1 (2020): 78–83. http://dx.doi.org/10.15864/jmscm.2105.

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The main aim of this paper is to study late time accelerated expansion of the universe with the help of k-essence scalar field. We have chosen non-canonical k-essence lagrangian of the form V(Φ)F(X), and converted to canonical lagrangian with the help of scaling ralation <mml:math display="inline"><mml:mrow><mml:msqrt><mml:mi>X</mml:mi></mml:msqrt><mml:msub><mml:mi>F</mml:mi><mml:mi>X</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mi>C</mml:mi><mml:msup><mml:mtext>a</mml:mtext><mml:m

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Ponnada, S., M. Brorby, and P. Kaaret. "Effects of metallicity on high-mass X-ray binary formation." Monthly Notices of the Royal Astronomical Society 491, no. 3 (2019): 3606–12. http://dx.doi.org/10.1093/mnras/stz2929.

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ABSTRACT The heating of the intergalactic medium in the early, metal-poor Universe may have been partly due to radiation from high-mass X-ray binaries (HMXBs). Previous investigations on the effect of metallicity have used galaxies of different types. To isolate the effects of metallicity on the production of HMXBs, we study a sample consisting only of 46 blue compact dwarf galaxies covering metallicity in the range 12+log(O/H) of 7.15–8.66. To test the hypothesis of metallicity dependence in the X-ray luminosity function (XLF), we fix the XLF form to that found for near-solar metallicity gala

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Kim, Dong-Woo, and Giuseppina Fabbiano. "Luminosity Evolution of the Hot Gas in Normal Galaxies from the Near Universe to z = 0.5." Astrophysical Journal 976, no. 1 (2024): 112. http://dx.doi.org/10.3847/1538-4357/ad8229.

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Abstract We explore the evolution of the ∼107 K hot gas in normal galaxies out to redshift = 0.5 (lookback time = 5 Gyr), using X-ray luminosity functions (XLFs) built from a sample of 575 normal galaxies with z < 0.6 detected in five high-galactic-latitude Chandra wide-field surveys. After estimating the emission due to the hot gas component (reducing the sample to ∼400 galaxies), we compared the XLF in three redshift bins (z = 0.1, 0.3, and 0.5), finding increases in the number of galaxies per unit comoving volume from z = 0.1 to 0.3 and then from z = 0.3 to 0.5. These XLF changes suggest

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Bottacini, Eugenio. "The SIX survey: evolution and properties of AGN in the local universe." Proceedings of the International Astronomical Union 9, S304 (2013): 139. http://dx.doi.org/10.1017/s174392131400355x.

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AbstractCurrent most sensitive surveys at soft X-ray (~ 0.5–10 keV) energies by Chandra and XMM-Newton preferably sample AGN at high-redshift (z > 0.5). At low-redshift (z < 0.5), where AGN are supposed to be in their evolution end-stage, these sources are very sparsely sampled. The low-redshift universe is best fathomed at hard X–ray energies (> 15 keV) by the INTEGRAL and the Swift missions with their coded-mask telescopes IBIS/ISGRI and BAT respectively. These instruments have two major advantages: 1) they have a huge field of view, hence allowing to sample a large number of AGN at

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Lynden-Bell, D. "Local Group Dynamics." Symposium - International Astronomical Union 192 (1999): 39–50. http://dx.doi.org/10.1017/s0074180900203896.

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The distance from the Local Group to the ‘sphere’ of small galaxies that no longer expand with the Universe determines the time since the Big Bang, t x M1/2, where M is the mass of the Local Group. Adopting Feast's new distance scale, this distance is found to be 1.35 ± 0.1 Mpc. The velocity of approach and the distance to M31 give a different combination of t and M, thus both can be deduced. We find the time since the Big Bang and The importance of accurate distances for such results is stressed. If all distances are revised by a factor λ then both t and M change by that factor.

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Segal, I. E. "Geometric derivation of the chronometric redshift." Proceedings of the National Academy of Sciences 90, no. 23 (1993): 11114–16. http://dx.doi.org/10.1073/pnas.90.23.11114.

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The chronometric redshift-distance relation z = tan 2(1/2rho), where rho is the distance in radians in the Einstein metric, is derived by an elementary geometric analysis comparable to that in traditional analysis of the expanding universe model. The differential dTt of Einstein time evolution Tt through time t, as applied to the local Minkowski coordinates x, takes the form sec2(1/2t). At the point of observation t = rho, implying that for a sufficiently localized source, observed wave lengths are a factor of sec2(1/2rho) greater than the corresponding emitted wave lengths.

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Ganguly, Sougata, Sourov Roy, and Ananya Tapadar. "Secluded dark sector and muon (g-2) in the light of fast expanding Universe." Journal of Cosmology and Astroparticle Physics 2023, no. 02 (2023): 044. http://dx.doi.org/10.1088/1475-7516/2023/02/044.

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Abstract The lack of information before Big Bang Neucleosynthesis (BBN) allow us to assume the presence of a new species ϕ whose energy density redshifts as a -4+n where n > 0 and a is the scale factor. This non-standard cosmological setup facilitates a larger portal coupling (ϵ) between the dark and the visible sectors even when the two sectors are not in thermal equilibrium. Here, we have considered U(1) Lμ-Lτ ⊗ U(1) X gauge extension of the Standard Model (SM) and studied different phases of the cosmological evolution of a thermally decoupled dark sector such as leak-in, freeze-in, reann

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Bruni, G., F. Ursini, F. Panessa, et al. "Probing restarting activity in hard X-ray selected giant radio galaxies." Proceedings of the International Astronomical Union 14, A30 (2018): 66–69. http://dx.doi.org/10.1017/s1743921319003478.

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AbstractWith their sizes larger than 0.7 Mpc, Giant Radio Galaxies (GRGs) are the largest individual objects in the Universe. To date, the reason why they reach such enormous extensions is still unclear. One of the proposed scenarios suggests that they are the result of multiple episodes of jet activity. Cross-correlating the INTEGRAL+Swift AGN population with radio catalogues (NVSS, FIRST, SUMSS), we found that 22% of the sources are GRG (a factor four higher than those selected from radio catalogues). Remarkably, all of the sources in the sample show signs of restarting radio activity. The X

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Böhringer, Hans, Gayoung Chon, and Joachim Trümper. "The Cosmic Large-Scale Structure in X-rays (CLASSIX) Cluster Survey." Astronomy & Astrophysics 651 (July 2021): A15. http://dx.doi.org/10.1051/0004-6361/202140595.

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Previous studies of the galaxy and galaxy cluster distribution in the local Universe found indications for a large extension of the Local Supercluster up to a radius of 190 h70−1 Mpc. We are using our large and highly complete CLASSIX survey of X-ray luminous galaxy clusters detected in the ROSAT All Sky Survey to trace the matter distribution in the local Universe and to explore the size of the flattened local density structure associated with the Local Supercluster. The Local Supercluster is oriented almost perpendicular to the Galactic plane. Since Galactic extinction increases towards the

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Huang, Hai, and Long Huang. "The constraint of H0 from galaxy clusters and Hubble parameter data." International Journal of Modern Physics D 26, no. 11 (2017): 1750129. http://dx.doi.org/10.1142/s0218271817501292.

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Using comoving distance [Formula: see text] and angular diameter distance [Formula: see text], we recalculate parameters describing kinematical state of the universe, still combining the kinematical model of universe but not relying on dynamical equations for gravity. Comoving distance [Formula: see text] comes from Hubble data [Formula: see text] and is more reliable. Angular diameter distance [Formula: see text] comes from SZE (Sunyaev–Zel’dovich Effect) and X-ray data, and needs calibration. In low redshift case, we use expansion of relation between luminosity distance and redshift about re

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Park, Jongwon, Massimo Ricotti, and Kazuyuki Sugimura. "Population III star formation in an X-ray background – I. Critical halo mass of formation and total mass in stars." Monthly Notices of the Royal Astronomical Society 508, no. 4 (2021): 6176–92. http://dx.doi.org/10.1093/mnras/stab2999.

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ABSTRACT The first luminous objects forming in the universe produce radiation backgrounds in the far-ultraviolet and X-ray bands that affect the formation of Population III stars. Using a grid of cosmological hydrodynamics zoom-in simulations, we explore the impact of the Lyman–Warner (LW) and X-ray radiation backgrounds on the critical dark matter (DM) halo mass for Population III star formation and the total mass in stars per halo. We find that the LW radiation background lowers the H2 fraction and delays the formation of the Population III stars. On the other hand, X-ray irradiation anticip

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Sandoval, Brandon, Adi Foord, Steven W. Allen, et al. "Searching for the Highest-z Dual Active Galactic Nuclei in the Deepest Chandra Surveys." Astrophysical Journal 974, no. 1 (2024): 121. http://dx.doi.org/10.3847/1538-4357/ad6986.

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Abstract We present an analysis searching for dual active galactic nuclei (AGN) among 62 high-redshift (2.5 < z < 3.5) X-ray sources selected from the X-UDS, AEGIS-XD, CDF-S, and COSMOS-Legacy Chandra surveys. We aim to quantify the frequency of dual AGN in the high-redshift Universe, which holds implications for black hole merger timescales and low-frequency gravitational wave detection rates. We analyze each X-ray source using BAYMAX, an analysis tool that calculates the Bayes factor for whether a given archival Chandra AGN is more likely a single or dual point source. We find no stron

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Zhao, X., S. Marchesi, M. Ajello, et al. "The properties of the AGN torus as revealed from a set of unbiased NuSTAR observations." Astronomy & Astrophysics 650 (June 2021): A57. http://dx.doi.org/10.1051/0004-6361/202140297.

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The obscuration observed in active galactic nuclei (AGNs) is mainly caused by dust and gas distributed in a torus-like structure surrounding the supermassive black hole. However, the properties of the obscuring torus of an AGN in X-ray have not yet been fully investigated because of a lack of high-quality data and proper models. In this work, we perform a broadband X-ray spectral analysis of a large, unbiased sample of obscured AGNs (with line-of-sight column density 23 ≤ log(NH) ≤ 24) in the nearby Universe for which high-quality archival NuSTAR data are available. We analyzed the source spec

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Worrall, D. M., and M. Birkinshaw. "Jet-gas interactions at crucial jet power for feedback." Proceedings of the International Astronomical Union 10, S313 (2014): 260–65. http://dx.doi.org/10.1017/s174392131500229x.

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AbstractMost X-ray studies of radio-mode feedback have concentrated on locally-abundant low-power radio sources in relatively rich cluster environments. But the scaling found between mechanical and radiative power, when combined with the radio luminosity function, means that half of the heating in the local Universe is expected from higher-power sources, which lie within a factor of about three of the FRI/II transition, and these sources encounter a wide range of atmosphere properties. We summarize what is observed at FRI/II transition powers from a complete sample observed with modest Chandra

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Campana, Sergio, Davide Lazzati, Rosalba Perna, Maria Grazia Bernardini, and Lara Nava. "The variable absorption in the X-ray spectrum of GRB 190114C." Astronomy & Astrophysics 649 (May 2021): A135. http://dx.doi.org/10.1051/0004-6361/202140439.

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Gamma-ray burst (GRB) 190114C was a bright burst that occurred in the local Universe (z = 0.425). It was the first GRB ever detected at teraelectronvolt (TeV) energies, and this was thanks to MAGIC. We characterize the ambient medium properties of the host galaxy through the study of the absorbing X-ray column density. Using a combination of Swift, XMM-Newton, and NuSTAR observations, we find that the GRB X-ray spectrum is characterized by a high column density that is well in excess of the expected Milky Way value and decreases, by a factor of ∼2, around ∼105 s. Such a variability is not comm

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Wen, Z. L., J. L. Han, and Z. S. Yuan. "A catalogue of merging clusters of galaxies: cluster partners, merging subclusters, and post-collision clusters." Monthly Notices of the Royal Astronomical Society 532, no. 2 (2024): 1849–86. http://dx.doi.org/10.1093/mnras/stae1614.

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ABSTRACT Clusters of galaxies are merging during the formation of large-scale structures in the Universe. Based on optical survey data, we identify a large sample of pre-mergers of galaxy clusters and merging subclusters in rich clusters. We find 39 382 partners within a velocity difference of 1500 km s$^{-1}$ and a projected separation of 5 $r_{500}$ around 33 126 main clusters, where $r_{500}$ is the radius of the main cluster. Based on the galaxy distribution inside rich clusters with more than 30 member galaxy candidates, we identify subclusters by modelling the smoothed optical distributi

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Uskov, G. S., S. Yu Sazonov, M. R. Gilfanov, I. Yu Lapshov, and R. A. Sunyaev. "X-ray Properties of the Luminous Quasar PG 1634+706 at z = 1.337 from SRG and XMM-Newton Data." Письма в Астрономический журнал: Астрономия и космическая астрофизика 49, no. 11 (2023): 717–34. http://dx.doi.org/10.31857/s0320010823110098.

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In the fall of 2019, during the in-flight calibration phase of the SRG observatory, theonboard eROSITA and Mikhail Pavlinsky ART-XC telescopes carried out a series of observations ofPG1634+706—one of the most luminous (an X-ray luminosity ∼1046 erg s−1) quasars in the Universe atz 2. Approximately at the same dates this quasar was also observed by the XMM-Newton observatory.Although the object had already been repeatedly studied in X-rays previously, its new observations allowedits energy spectrumto be measuredmore accurately in the wide range 1–30 keV (in the quasar rest frame).Its spectrum c

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Lehner, Nicolas, Claire Kopenhafer, John M. O’Meara, et al. "KODIAQ-Z: Metals and Baryons in the Cool Intergalactic and Circumgalactic Gas at 2.2 ≲ z ≲ 3.6." Astrophysical Journal 936, no. 2 (2022): 156. http://dx.doi.org/10.3847/1538-4357/ac7400.

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Abstract We present the KODIAQ-Z survey aimed to characterize the cool, photoionized gas at 2.2 ≲ z ≲ 3.6 in 202 H i-selected absorbers with 14.6 ≤ log N H I < 20 that probe the interface between galaxies and the intergalactic medium (IGM). We find that gas with 14.6 ≤ log N H I < 20 at 2.2 ≲ z ≲ 3.6 can be metal-rich (−1.6 ≲ [X/H] ≲ − 0.2) as seen in damped Lyα absorbers (DLAs); it can also be very metal-poor ([X/H] < − 2.4) or even pristine ([X/H] < − 3.8), which is not observed in DLAs but is common in the IGM. For 16 < log N H I < 20 absorbers, the frequency of pristine a

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Myklush, M. I., and V. K. Marinich. "Cosmic jurisdictions: quod lege naturae, moribus et consuetudine inductum est." Uzhhorod National University Herald. Series: Law 5, no. 86 (2025): 264–86. https://doi.org/10.24144/2307-3322.2024.86.5.40.

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The study is devoted to organizing the legal space of the Universe based on “ius naturale,” morals, and consuetudes of space activities, with the prospects for the existence of extraterrestrial intelligent beings in the Universe. On the grounds of the results of the study, 7 natural factors and 2 technical factors are identified, the influence of which determines the spaces to which the sovereignty and jurisdiction of both states and all of humanity extend. Based on these factors, the NMC Concept “natura, moribus et consuetudines” is proposed, according to which, due to natural and other facto

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Bolognesi, S. "A cosmology of a trans-Planckian theory and dark energy." International Journal of Modern Physics D 23, no. 05 (2014): 1450046. http://dx.doi.org/10.1142/s0218271814500461.

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We investigate a model based on a generalized version of the Fourier transform for curved spacetime manifolds. This model is possible if the metric has an asymptotic flat region which allows a duality to be implement between coordinates and momenta, hence, the model's name, trans-Planckian. The theory and the action are based on the postulate of the absolute egalitarian relation between coordinates x and momenta p. We show how to implement this construction in a cosmological setting, on a Friedman–Robertson–Walker (FRW) metric background, where the asymptotic time infinity plays the role of th

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Masini, Alberto, Annalisa Celotti, Paola Grandi, Emily Moravec, and Wendy L. Williams. "A new distant giant radio galaxy in the Boötes field serendipitously detected by Chandra." Astronomy & Astrophysics 650 (June 2021): A51. http://dx.doi.org/10.1051/0004-6361/202140528.

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Context. Giant radio galaxies (GRGs) are the largest single structures in the Universe. Exhibiting extended radio morphology, their projected sizes range from 0.7 Mpc up to 4.9 Mpc. LOFAR has opened a new window on the discovery and investigation of GRGs and, despite the hundreds that are known today, their main growth catalyst is still under debate. Aims. One natural explanation for the exceptional size of GRGs is their old age. In this context, hard X-ray selected GRGs show evidence of restarting activity, with the giant radio lobes being mostly disconnected from the nuclear source, if any a

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Qu, Yuanhong, and Bing Zhang. "Neutrino emission from fast radio burst-emitting magnetars." Monthly Notices of the Royal Astronomical Society 511, no. 1 (2022): 972–79. http://dx.doi.org/10.1093/mnras/stac117.

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ABSTRACT The detection of a bright radio burst (hereafter FRB 200428) in association with a hard X-ray burst from the Galactic magnetar SGR 1935+2154 suggests that magnetars can make fast radio bursts (FRBs). We study possible neutrino emission from FRB-emitting magnetars by developing a general theoretical framework. We consider three different sites for proton acceleration and neutrino emission i.e. within the magnetosphere, in the current sheet region beyond the light cylinder, and in relativistic shocks far away from the magnetosphere. Different cooling processes for protons and pions are

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Ighina, L., S. Belladitta, A. Caccianiga, et al. "Radio detection of VIK J2318−3113, the most distant radio-loud quasar (z = 6.44)." Astronomy & Astrophysics 647 (March 2021): L11. http://dx.doi.org/10.1051/0004-6361/202140362.

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We report the 888 MHz radio detection in the Rapid ASKAP Continuum Survey (RACS) of VIK J2318−3113, a z = 6.44 quasar. Its radio luminosity (1.2 × 1026 W Hz−1 at 5 GHz) compared to the optical luminosity (1.8 × 1024 W Hz−1 at 4400 Å) makes it the most distant radio-loud quasar observed so far, with a radio loudness R ∼ 70 (R = L5 GHz/L4400 Å). Moreover, the high bolometric luminosity of the source (Lbol = 7.4 × 1046 erg s−1) suggests the presence of a supermassive black hole with a high mass (≳6 × 108 M⊙) at a time when the Universe was younger than a billion years. Combining the new radio dat

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COHEN, MARCUS. "INERTIAL MASS FROM SPIN NONLINEARITY." International Journal of Modern Physics D 07, no. 05 (1998): 663–99. http://dx.doi.org/10.1142/s0218271898000450.

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The inertial mass of a Fermion shows up as chiral cross-coupling in its Dirac system. No scalar term can invariantly couple left and right chirality fields; the Dirac matrices must be spin tensors of mixed chirality. We show how such tensor couplings could arise from nonlinear mixing of four spinor fields, two representing the local electron fields and two inertial spinor fields sourced in the distant masses. We thus give a model that implements Mach's principle. Following Mendel Sachs,1 we let the inertial spinors factor the moving spacetime tetrads qα(x) and [Formula: see text] that appear i

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Miller, Clifford, and Donald Miller. "Medicine is not science." European Journal for Person Centered Healthcare 2, no. 2 (2014): 144. http://dx.doi.org/10.5750/ejpch.v2i2.700.

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If scientific knowledge cannot be distinguished from other knowledge we cannot prohibit use of unscientific and non-scientific knowledge in medicine. Science addresses narrow closely defined questions (hypotheses) in closely controlled conditions by carefully designed experiments to elicit a narrow range of evidence of high reliability, adopting the highest standards of proof. Science proves cause and effect by intervention demonstrating regularity of outcome. Universal generalisation by theory enables accurate and reliable prediction in existing previously observed and unobserved cases and in

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West, Lacey, Kristen Garofali, Bret D. Lehmer, et al. "The Large Deficit of HMXB Emission from Luminous Infrared Galaxies: The Case of the Circumnuclear Starburst Ring in NGC 7552." Astrophysical Journal 952, no. 1 (2023): 22. http://dx.doi.org/10.3847/1538-4357/acd9aa.

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Abstract Luminous infrared galaxies (LIRGs), the most extreme star-forming galaxies in the nearby (D < 30 Mpc) universe, show a notable X-ray emission deficiency (up to a factor of ∼10) compared with predictions from scaling relations of galaxy-wide high-mass X-ray binary (HMXB) luminosity with star formation rate. In the nearby (≈20 Mpc) LIRG NGC 7552, the majority of the IR emission originates in a circumnuclear starburst ring, which has been resolved into several discrete knots of star formation. We present results from recent Chandra observations of NGC 7552, which reveal significant de

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Sahakyan, N., D. Israyelyan, G. Harutyunyan, M. Khachatryan, and S. Gasparyan. "Multiwavelength study of high-redshift blazars." Monthly Notices of the Royal Astronomical Society 498, no. 2 (2020): 2594–613. http://dx.doi.org/10.1093/mnras/staa2477.

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ABSTRACT High-redshift blazars are among the most powerful objects in the Universe. The spectral and temporal properties of 33 distant blazars (z &gt; 2.5) detected in the high-energy γ-ray band are investigated by analysing the Fermi-LAT and Swift Ultraviolet and Optical Telescope/X-ray Telescope (UVOT/XRT) data. The considered sources have soft time-averaged γ-ray spectra (Γγ ≥ 2.2) whereas those that have been observed in the X-ray band have hard X-ray spectra (ΓX = 1.01−1.86). The γ-ray flux of high-redshift blazars ranges from 4.84 × 10−10 to 1.50 × 10−7 photon cm−2 s−1 and the lumino

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Mejía-Restrepo, Julian E., Benny Trakhtenbrot, Michael J. Koss, et al. "BASS. XXV. DR2 Broad-line-based Black Hole Mass Estimates and Biases from Obscuration." Astrophysical Journal Supplement Series 261, no. 1 (2022): 5. http://dx.doi.org/10.3847/1538-4365/ac6602.

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Abstract We present measurements of broad emission lines and virial estimates of supermassive black hole masses (M BH) for a large sample of ultrahard X-ray-selected active galactic nuclei (AGNs) as part of the second data release of the BAT AGN Spectroscopic Survey (BASS/DR2). Our catalog includes M BH estimates for a total of 689 AGNs, determined from the Hα, Hβ, Mg ii λ2798, and/or C iv λ1549 broad emission lines. The core sample includes a total of 512 AGNs drawn from the 70 month Swift/BAT all-sky catalog. We also provide measurements for 177 additional AGNs that are drawn from deeper Swi

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Diana, A., A. Caccianiga, L. Ighina, S. Belladitta, A. Moretti, and R. Della Ceca. "The evolution of the heaviest supermassive black holes in jetted AGNs." Monthly Notices of the Royal Astronomical Society 511, no. 4 (2022): 5436–47. http://dx.doi.org/10.1093/mnras/stac364.

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ABSTRACT We present the space density evolution, from z = 1.5 up to z = 5.5, of the most massive ($M \ge 10^9\, \mathrm{M}_{\odot }$) black holes hosted in jetted active galactic nuclei (AGNs). The analysis is based on a sample of 380 luminosity-selected (λL1350 ≥ 1046 erg s−1 and $P_{5\, \text{GHz}}\ge 10^{27}$ W Hz−1) flat spectrum radio quasars (FSRQs) obtained from the Cosmic Lens All Sky Survey (CLASS). These sources are known to be face-on jetted AGNs (i.e. blazars) and can be exploited to infer the abundance of all the (misaligned) jetted AGNs, using a geometrical argument. We then comp

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Cugnetti, Ana Paula, Haizhen Liu, Patricia McNeeley, et al. "Abstract 1871: Novel conditionally active bispecific HER2 x CD3 T cell engager targeting solid tumors." Cancer Research 83, no. 7_Supplement (2023): 1871. http://dx.doi.org/10.1158/1538-7445.am2023-1871.

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Abstract Human epidermal growth factor receptor 2 (HER2) is overexpressed in multiple cancers and is associated with poor prognosis. Despite the outstanding improvement in survival with the introduction of anti-HER2 therapies, therapeutic benefit is limited by many resistance mechanisms and toxicities. Clinical trials of therapeutics redirecting T cell activity to HER2+ tumors have highlighted the apparent risk of on-target, off-tumor adverse effects for this target, as HER2 is also expressed in normal epithelia. Using BioAtla’s Conditionally Active Biologic (CAB) platform, we have developed a

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Ricci, C., T. T. Ananna, M. J. Temple, et al. "BASS XXXVII: The Role of Radiative Feedback in the Growth and Obscuration Properties of Nearby Supermassive Black Holes." Astrophysical Journal 938, no. 1 (2022): 67. http://dx.doi.org/10.3847/1538-4357/ac8e67.

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Abstract We study the relation between obscuration and supermassive black hole (SMBH) accretion using a large sample of hard X-ray selected active galactic nuclei (AGNs). We find a strong decrease in the fraction of obscured sources above the Eddington limit for dusty gas ( log λ Edd ≳ − 2 ) confirming earlier results, and consistent with the radiation-regulated unification model. This also explains the difference in the Eddington ratio distribution functions (ERDFs) of type 1 and type 2 AGNs obtained by a recent study. The break in the ERDF of nearby AGNs is at log λ Edd * = − 1.34 ± 0.07 . T

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Khambali, Khambali, Mahmud Mahmud, and Andewi Suhartini. "THE CONCEPT OF GOD'S ABILITY (QUDRATULLAH) IN ISLAMIC EDUCATION." Ta dib Jurnal Pendidikan Islam 11, no. 2 (2022): 107–16. http://dx.doi.org/10.29313/tjpi.v11i2.10068.

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The purpose of this study is to describe the concept of qudratullah (the ability that Allah determines) or it can be said as destiny in relation to Islamic education based on explanations by commentators/ mufassirin and theologians in the study of kalam science, so as to straighten understanding of the concept of God's destiny. in the world of Islamic Education. This research is library research (library research) where the sources that are used as references in this research are taken from the library, such as books, books, articles, and others. This study also uses the maudhu'i interpretatio

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Álvarez-Márquez, J., R. Marques-Chaves, L. Colina, and I. Pérez-Fournon. "Detection of an ionized gas outflow in the extreme UV-luminous star-forming galaxy BOSS-EUVLG1 at z = 2.47." Astronomy & Astrophysics 647 (March 2021): A133. http://dx.doi.org/10.1051/0004-6361/202039375.

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BOSS-EUVLG1 is the most ultraviolet (UV) and Lyα luminous galaxy to be going through a very active starburst phase detected thus far in the Universe. It is forming stars at a rate of 955 ± 118 M⊙ yr−1. We report the detection of a broad Hα component carrying 25% of the total Hα flux. The broad Hα line traces a fast and massive ionized gas outflow characterized by a total mass, log(Mout[M⊙]), of 7.94 ± 0.15, along with an outflowing velocity (Vout) of 573 ± 151 km s−1 and an outflowing mass rate (Ṁout) of 44 ± 20 M⊙ yr−1. The presence of the outflow in BOSS-EUVLG1 is also supported by the ident

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Marín Prada, María del Carmen, Francisco Gutiérrez García, Miguel Ángel Martínez Morales, and Jhossmar Cristians Auza-Santivañez. "Chronic Kidney Disease, Mortality in the Elderly in Cuba." Multidisciplinar (Montevideo) 2 (August 9, 2024): 97. http://dx.doi.org/10.62486/agmu202497.

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Introduction: Population aging is a global reality. Age is the most important prognostic factor for kidney disease. Objective: To characterize the mortality of the elderly with chronic kidney disease (CKD) in Cuba, in the period 2011-2019. Methods: Cross-sectional descriptive research. The universe corresponded to the 24 181 deceased over 60 years with CKD in Cuba in the period. The information was taken from the mortality database of the Ministry of Public Health. Absolute and relative frequencies, crude rates of mortality, specific and years of life potentially lost were calculated. Mortalit

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Torres-Albà, Núria, Valentí Bosch-Ramon, and Kazushi Iwasawa. "AGN jets versus accretion as reionization sources." Astronomy & Astrophysics 635 (March 2020): A57. http://dx.doi.org/10.1051/0004-6361/201936047.

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Context. Cosmic reionization put an end to the dark ages that came after the recombination era. Observations seem to favor the scenario of massive-star photons generated in low-mass galaxies being responsible for the bulk of reionization and, whereas a possible contribution from AGN accretion disks has been widely considered, they are currently thought to have had a minor role in reionization. Aims. We aim to study the possibility of AGN having contributed to reionization not only through their accretion disks, but also through ionizing photons coming from the AGN jets interacting with the int

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Fujita, Toru, Koji Nakano, and Yasuaki Ito. "Fast Simulation of Conway’s Game of Life Using Bitwise Parallel Bulk Computation on a GPU." International Journal of Foundations of Computer Science 27, no. 08 (2016): 981–1003. http://dx.doi.org/10.1142/s0129054116500404.

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Conway’s Game of Life is the most well-known cellular automaton. The universe of the Game of Life is a 2-dimensional array of cells, each of which takes two possible states, alive or dead. The state of every cell is repeatedly updated according to those of eight neighbors. A cell will be alive if exactly three neighbors are alive, or if it is alive and two neighbors are alive. The main contribution of this paper is to develop several acceleration techniques for simulating the Game of Life using a GPU as follows: (1) the states of 32/64 cells in 32/64-bit words (integers) and the next states ar

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Kar, Arpan, Hyomin Kim, Sang Pyo Kim, and Stefano Scopel. "WIMP constraints from black hole low-mass X-ray binaries." Journal of Cosmology and Astroparticle Physics 2024, no. 03 (2024): 030. http://dx.doi.org/10.1088/1475-7516/2024/03/030.

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Abstract The abnormally fast orbital decay observed in the black hole (BH) Low-Mass X-ray binaries (BH-LMXB) A0620-00 and XTE J1118+480 can be explained by the dynamical friction between Dark Matter (DM) and the companion star orbiting around the low-mass BH (≃ a few M ⊙) of the system. In this case the value of the index γ sp of the DM spike surrounding the BH can be pinned down with an accuracy of ≃ a few percent, way better than that for much bigger systems such as the super massive BHs (SMBHs) in the Galactic Center or in M87. We have used data from XTE J1118+480 to put bounds on the WIMP

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Su, Zhao, Zhiyuan Li, and Zongnan Li. "Wind-fed Supermassive Black Hole Accretion by the Nuclear Star Cluster: The Case of M31*." Astrophysical Journal 988, no. 1 (2025): 68. https://doi.org/10.3847/1538-4357/ade1d5.

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Abstract The central supermassive black hole (SMBH) of the Andromeda galaxy, known as M31*, exhibits dim electromagnetic emission and is inferred to have an extremely low accretion rate for its remarkable mass (∼108 M ⊙). In this work, we use three-dimensional hydrodynamical simulations to explore a previously untested scenario, in which M31* is fed by the collective stellar mass loss from its surrounding nuclear star cluster, manifested as a famous eccentric disk of predominantly old stellar populations. The stellar mass loss is assumed to be dominated by the slow and cold winds from 100 asym

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Likhit, Junkaew, Wongchantra Prayoon, Ongon Suparat, Sookngam Kannika, and Uraiwan Praimee. "Factors affecting environmental ethics behavior of undergraduate students." International Journal of Evaluation and Research in Education (IJERE) 14, no. 1 (2025): 557. http://dx.doi.org/10.11591/ijere.v14i1.28443.

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The research aimed to investigate the variables affecting undergraduate students’ environmental ethical conduct as well as the variables influencing the environmental ethical behavior of undergraduate students of various genders and academic years. In the topic of environmental education, year 1-4 pupils made up the research sample. A total of 231 people from Mahasarakham University’s Faculty of Environment and Resource Studies freely provided information. A survey was used as the research method to assess the variables influencing undergraduate students’ ethical conduct in the environment. Fr

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Roll-Mecak, Antonina, Chune Cao, Thomas E. Dever, and Stephen K. Burley. "X-Ray Structures of the Universal Translation Initiation Factor IF2/eIF5B." Cell 103, no. 5 (2000): 781–92. http://dx.doi.org/10.1016/s0092-8674(00)00181-1.

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