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Journal articles on the topic 'Intergalactic medium; Cosmology'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Nath, Biman B. "Cosmology with the intergalactic medium." Pramana 53, no. 6 (1999): 1021–25. http://dx.doi.org/10.1007/s12043-999-0058-z.

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Bryan, Greg L., та Marie E. Machacek. "ThebDistribution of the Lyα Forest: Probing Cosmology and the Intergalactic Medium". Astrophysical Journal 534, № 1 (2000): 57–68. http://dx.doi.org/10.1086/308735.

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Sargent, Wallace L. W. "QSO Absorption Lines and Cosmology." Symposium - International Astronomical Union 124 (1987): 777–92. http://dx.doi.org/10.1017/s0074180900159911.

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The properties of the different types of QSO absorption systems are briefly summarized. An overview is given of the potential applications of absorption lines in cosmology. Recent work on the cosmological evolution of the different types of absorbers is discussed. The physical properties of the intergalactic medium are discussed in the light of recent work on the “Lyman alpha clouds”. The uses of the lines for studies of the evolution of clustering in the Universe are described. Recent puzzling results on common absorption in pairs of QSOs, particularly Q1037–2704 and Q1038–2712, are summarize

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Ferrara, Andrea. "Cosmic metal enrichment." Proceedings of the International Astronomical Union 4, S255 (2008): 86–99. http://dx.doi.org/10.1017/s1743921308024630.

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AbstractI review the present understanding of the process by which the universe has been enriched in the course of its history with heavy elements produced by stars and transported into the surrounding intergalactic medium. This process goes under the name of “cosmic metal enrichment” and presents some of the most challenging puzzles in present day physical cosmology. These are reviewed along with some proposed explanations that all together form a coherent working scenario.

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Duc, Pierre-Alain, Frédéric Bournaud, and Médéric Boquien. "Tidal dwarf galaxies as laboratories of star formation and cosmology." Proceedings of the International Astronomical Union 2, S237 (2006): 323–30. http://dx.doi.org/10.1017/s1743921307001676.

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AbstractStar formation may take place in a variety of locations in interacting systems: in the dense core of mergers, in the shock regions at the interface of the colliding galaxies and even within the tidal debris expelled into the intergalactic medium. Along tidal tails, objects may be formed with masses ranging from those of super-star clusters to dwarf galaxies: the so-called Tidal Dwarf Galaxies (TDGs). Based on a set of multi-wavelength observations and extensive numerical simulations, we show how TDGs may simultaneously be used as laboratories to study the process of star-formation (SFE

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Durrive, Jean-Baptiste, Hiroyuki Tashiro, Mathieu Langer, and Naoshi Sugiyama. "Mean Energy Density of Photogenerated Magnetic Fields Throughout the EoR." Proceedings of the International Astronomical Union 12, S333 (2017): 60–63. http://dx.doi.org/10.1017/s1743921317011309.

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AbstractThere seems to be magnetic fields at all scales and epochs in our Universe, but their origin at large scales remains an important open question of cosmology. In this work we focus on the generation of magnetic fields in the intergalactic medium due to the photoionizations by the first galaxies, all along the Epoch of Reionization. Based on previous studies which considered only isolated sources, we develop an analytical model to estimate the mean magnetic energy density accumulated in the Universe by this process. In our model, without considering any amplification process, the Univers

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Eastwood, Michael W., and Gregg Hallinan. "Full-Sky Maps of the VHF Radio Sky with the Owens Valley Radio Observatory Long Wavelength Array." Proceedings of the International Astronomical Union 12, S333 (2017): 110–13. http://dx.doi.org/10.1017/s1743921317011231.

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Abstract21-cm cosmology is a powerful new probe of the intergalactic medium at redshifts 20 ≳ z ≳ 6 corresponding to the Cosmic Dawn and Epoch of Reionization. Current observations of the highly-redshifted 21-cm transition are limited by the dynamic range they can achieve against foreground sources of low-frequency (<200 MHz) of radio emission. We used the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA) to generate a series of new modern high-fidelity sky maps that capture emission on angular scales ranging from tens of degrees to ∼15 arcmin, and frequencies between 36 and 7

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Shapiro, Paul R. "Chemistry in the Early Universe." Symposium - International Astronomical Union 150 (1992): 73–82. http://dx.doi.org/10.1017/s0074180900089737.

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Galaxies and the first stars in the universe formed billions of years ago as a result of the cooperative effects of gravitational collapse and nonequilibrium chemistry. Gravity drew the primordial gas together into lumps; the formation of the first molecules in the universe, simple diatomic molecules like H2, H2+, HD, HeH+, LiH, and LiH+, may then have ensured that the heat generated by gravitational collapse and shock waves was radiated away rapidly enough to allow the gravitational collapse and fragmentation of these gaseous lumps to proceed to the point of forming stars and galaxies. We bri

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Li, Z., H. Gao, J.-J. Wei, Y.-P. Yang, B. Zhang, and Z.-H. Zhu. "Cosmology-insensitive estimate of IGM baryon mass fraction from five localized fast radio bursts." Monthly Notices of the Royal Astronomical Society: Letters 496, no. 1 (2020): L28—L32. http://dx.doi.org/10.1093/mnrasl/slaa070.

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ABSTRACT Five fast radio bursts (FRBs), including three apparently non-repeating ones, FRB 180924, FRB 181112, and FRB 190523, and two repeaters, FRB 121102 and FRB 180916.J0158+65, have already been localized so far. We apply a method developed recently by us to these five localized FRBs to give a cosmology-insensitive estimate of the fraction of baryon mass in the intergalactic medium, fIGM. Using the measured dispersion measure (DM) and luminosity distance dL data (inferred from the FRB redshifts and dL of Type Ia supernovae at the same redshifts) of the five FRBs, we constrain the local $f

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10

Cen, Renyue, and Jeremiah P. Ostriker. "Cold Dark Matter Cosmology with Hydrodynamics and Galaxy Formation: The Evolution of the Intergalactic Medium and Background Radiation Fields." Astrophysical Journal 417 (November 1993): 404. http://dx.doi.org/10.1086/173321.

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11

Padmanabhan, Hamsa. "Neutral hydrogen in the post-reionization universe." Proceedings of the International Astronomical Union 12, S333 (2017): 216–21. http://dx.doi.org/10.1017/s1743921317010821.

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AbstractThe evolution of neutral hydrogen (HI) across redshifts is a powerful probe of cosmology, large scale structure in the universe and the intergalactic medium. Using a data-driven halo model to describe the distribution of HI in the post-reionization universe (z ∼ 5 to 0), we obtain the best-fitting parameters from a rich sample of observational data: low redshift 21-cm emission line studies, intermediate redshift intensity mapping experiments, and higher redshift Damped Lyman Alpha (DLA) observations. Our model describes the abundance and clustering of neutral hydrogen across redshifts

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12

Samland, Markus. "A Model for the Formation of the Milky Way." Publications of the Astronomical Society of Australia 21, no. 2 (2004): 175–78. http://dx.doi.org/10.1071/as04009.

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AbstractA new chemodynamical model for the formation and evolution of a Milky Way type galaxy is introduced. In this scenario, the galaxy forms inside a slowly growing dark matter halo in a ΛCDM cosmology. In contrast to the simple merger and collapse scenarios, the galactic mass grows continuously over a Hubble time. The whole formation scenario is simulated with a three-dimensional chemodynamical code. Within this model it is possible to follow the evolution of the galactic substructure in detail. The structure of the galactic components — halo, bulge, and disk — and the kinematical and chem

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Read, J. I., and Neil Trentham. "The baryonic mass function of galaxies." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, no. 1837 (2005): 2693–710. http://dx.doi.org/10.1098/rsta.2005.1648.

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In the Big Bang about 5% of the mass that was created was in the form of normal baryonic matter (neutrons and protons). Of this about 10% ended up in galaxies in the form of stars or of gas (that can be in molecules, can be atomic, or can be ionized). In this work, we measure the baryonic mass function of galaxies, which describes how the baryonic mass is distributed within galaxies of different types (e.g. spiral or elliptical) and of different sizes. This can provide useful constraints on our current cosmology, convolved with our understanding of how galaxies form. This work relies on variou

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Mirocha, Jordan, Henri Lamarre, and Adrian Liu. "Systematic uncertainties in models of the cosmic dawn." Monthly Notices of the Royal Astronomical Society 504, no. 2 (2021): 1555–64. http://dx.doi.org/10.1093/mnras/stab949.

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ABSTRACT Models of the reionization and reheating of the intergalactic medium (IGM) at redshifts z ≳ 6 continue to grow more sophisticated in anticipation of near-future 21-cm, cosmic microwave background, and galaxy survey measurements. However, there are many potential sources of systematic uncertainty in models that could bias and/or degrade upcoming constraints if left unaccounted for. In this work, we examine three commonly ignored sources of uncertainty in models for the mean reionization and thermal histories of the IGM: the underlying cosmology, halo mass function (HMF), and choice of

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Chernoff, David F., Ariel Goobar, and Janina J. Renk. "Prospects of cosmic superstring detection through microlensing of extragalactic point-like sources." Monthly Notices of the Royal Astronomical Society 491, no. 1 (2019): 596–614. http://dx.doi.org/10.1093/mnras/stz2855.

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ABSTRACT The existence of cosmic superstrings may be probed by astronomical time domain surveys. When crossing the line of sight to point-like sources, strings produce a distinctive microlensing signature. We consider two avenues to hunt for a relic population of superstring loops: frequent monitoring of (1) stars in Andromeda, lensed by loops in the haloes of the Milky-Way and Andromeda and (2) supernovae at cosmological distances, lensed by loops in the intergalactic medium. We assess the potential of such experiments to detect and/or constrain strings with a range of tensions, 10−15 ≲ Gμ/c2

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16

Hall, Kirsten R., Nadia L. Zakamska, Graeme E. Addison, et al. "Quantifying the thermal Sunyaev–Zel’dovich effect and excess millimetre emission in quasar environments." Monthly Notices of the Royal Astronomical Society 490, no. 2 (2019): 2315–35. http://dx.doi.org/10.1093/mnras/stz2751.

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ABSTRACT In this paper, we probe the hot, post-shock gas component of quasar-driven winds through the thermal Sunyaev–Zel’dovich (tSZ) effect. Combining data sets from the Atacama Cosmology Telescope, the Herschel Space Observatory, and the Very Large Array, we measure average spectral energy distributions of 109 829 optically selected, radio quiet quasars from 1.4 to 3000 GHz in six redshift bins between 0.3 &lt; z &lt; 3.5. We model the emission components in the radio and far-infrared, plus a spectral distortion from the tSZ effect. At z &gt; 1.91, we measure the tSZ effect at 3

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17

Inserra, C., R. C. Nichol, D. Scovacricchi, et al. "Euclid: Superluminous supernovae in the Deep Survey." Astronomy & Astrophysics 609 (January 2018): A83. http://dx.doi.org/10.1051/0004-6361/201731758.

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Context. In the last decade, astronomers have found a new type of supernova called superluminous supernovae (SLSNe) due to their high peak luminosity and long light-curves. These hydrogen-free explosions (SLSNe-I) can be seen to z ~ 4 and therefore, offer the possibility of probing the distant Universe. Aims. We aim to investigate the possibility of detecting SLSNe-I using ESA’s Euclid satellite, scheduled for launch in 2020. In particular, we study the Euclid Deep Survey (EDS) which will provide a unique combination of area, depth and cadence over the mission. Methods. We estimated the redshi

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18

Japelj, J., C. Laigle, M. Puech та ін. "Simulating MOS science on the ELT: Lyα forest tomography". Astronomy & Astrophysics 632 (грудень 2019): A94. http://dx.doi.org/10.1051/0004-6361/201936048.

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Mapping the large-scale structure through cosmic time has numerous applications in studies of cosmology and galaxy evolution. At z ≳ 2, the structure can be traced by the neutral intergalactic medium (IGM) by way of observing the Lyα forest towards densely sampled lines of sight of bright background sources, such as quasars and star-forming galaxies. We investigate the scientific potential of MOSAIC, a planned multi-object spectrograph on the European Extremely Large Telescope (ELT), for the 3D mapping of the IGM at z ≳ 3. We simulated a survey of 3 ≲ z ≲ 4 galaxies down to a limiting magnitud

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19

Romano, M., A. Grazian, E. Giallongo, et al. "Lyman continuum escape fraction and mean free path of hydrogen ionizing photons for bright z ∼ 4 QSOs from SDSS DR14." Astronomy & Astrophysics 632 (November 26, 2019): A45. http://dx.doi.org/10.1051/0004-6361/201935550.

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Context. One of the main challenges in observational cosmology is related to the redshift evolution of the average hydrogen (HI) ionization in the Universe, as evidenced by the changing in ionization level of the intergalactic medium (IGM) through cosmic time. Starting from the first cosmic reionization, the rapid evolution of the IGM physical properties in particular poses severe constraints for the identification of the sources responsible for maintaining its high level of ionization up to lower redshifts. Aims. In order to probe the ionization level of the IGM and the ionization capabilitie

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20

Syromyatnikov, A. G. "Electro-gravity spin density waves." International Journal of Geometric Methods in Modern Physics 14, no. 10 (2017): 1750146. http://dx.doi.org/10.1142/s0219887817501468.

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It is known that some string models predict that strong bursts of gravitational radiation which should be detectable by LIGO, VIRGO and LISA detectors are accompanied by cosmologic gamma-ray bursts (GRBs). GRBs of low-energy gamma ray are associated with core-collapse supernovae (SN). However, measurements of the X-ray afterglow of very intense GRBs (allow a critical test of GRB theories) disagree with that predicted by widely accepted fireball internal–external shocks models of GRBs. It is also known that in a system of a large number of fermions, pairs of gravitational interaction occur on s

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21

Hennawi, Joseph F., Frederick B. Davies, Feige Wang, and Jose Oñorbe. "Probing Reionization and Early Cosmic Enrichment with the Mg II Forest." Monthly Notices of the Royal Astronomical Society, July 6, 2021. http://dx.doi.org/10.1093/mnras/stab1883.

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Abstract Because the same massive stars that reionized the intergalactic medium (IGM) inevitably exploded as supernovae that polluted the Universe with metals, the history of cosmic reionization and enrichment are intimately intertwined. While the overly sensitive Lyα transition completely saturates in a neutral IGM, strong low-ionization metal lines like the Mg ii λ2796, λ2804 doublet will give rise to a detectable ‘metal-line forest’ if the metals produced during reionization (Z ∼ 10−3Z⊙) permeate the neutral IGM. We simulate the Mg ii forest for the first time by combining a large hydrodyna

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