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Journal articles on the topic 'Enriched Black Hole'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Dr.K.Lenin. "ENRICHED BLACK HOLE ALGORITHM FOR DIMINUTION OF REAL POWER LOSS." International Journal of Research - Granthaalayah 5, no. 9 (2017): 186–94. https://doi.org/10.5281/zenodo.1002636.

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This paper presents an Enriched Black Hole (EBH) algorithm for solving reactive power flow problem. The Black Hole Algorithm starts with a preliminary population of contestant and for all iteration of the black hole algorithm, the most excellent candidate is favored to be the black hole, which followed by pulling further candidates around it, called stars. If a star move very close to the black hole, it will be consumed by the black hole and is vanished undyingly. In such a case, a new star - candidate solution is arbitrarily created and placed in the exploration space and starts a new search.

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Lenin, K. "ENRICHED BLACK HOLE ALGORITHM FOR DIMINUTION OF REAL POWER LOSS." International Journal of Research -GRANTHAALAYAH 5, no. 9 (2017): 186–94. http://dx.doi.org/10.29121/granthaalayah.v5.i9.2017.2228.

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This paper presents an Enriched Black Hole (EBH) algorithm for solving reactive power flow problem. The Black Hole Algorithm starts with a preliminary population of contestant and for all iteration of the black hole algorithm, the most excellent candidate is favored to be the black hole, which followed by pulling further candidates around it, called stars. If a star move very close to the black hole, it will be consumed by the black hole and is vanished undyingly. In such a case, a new star - candidate solution is arbitrarily created and placed in the exploration space and starts a new search.

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3

Kanagasabai, Lenin. "Factual power loss reduction by enriched black hole algorithm." International Journal of Applied Power Engineering (IJAPE) 10, no. 2 (2021): 97–101. https://doi.org/10.11591/ijape.v10.i2.pp97-101.

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This paper presents enriched black hole algorithm (EBHA) for solving optimal reactive power problem. In this work black hole algorithm based on membrane computing is projected. In black hole algorithm evolution of the population is through pushing the candidates in the course of the most excellent candidate in iterations and black hole which swap with those in the search space. Membrane computing is also branded as P system and it has multisets of objects with evolution rules in the membrane structure. Membrane structure is alike ingrained tree of section that demarcate the areas, and root is

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Kanagasabai, Lenin. "Factual power loss reduction by enriched black hole algorithm." International Journal of Applied Power Engineering 10, no. 2 (2021): 97~101. https://doi.org/10.5281/zenodo.7344400.

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This paper presents enriched black hole algorithm (EBHA) for solving optimal reactive power problem. In this work black hole algorithm based on membrane computing is projected. In black hole algorithm evolution of the population is through pushing the candidates in the course of the most excellent candidate in iterations and black hole which swap with those in the search space. Membrane computing is also branded as P system and it has multisets of objects with evolution rules in the membrane structure. Membrane structure is alike ingrained tree of section that demarcate the areas, and root is

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Lenin, Kanagasabai. "Factual power loss reduction by enriched black hole algorithm." International Journal of Applied Power Engineering (IJAPE) 10, no. 2 (2021): 97. http://dx.doi.org/10.11591/ijape.v10.i2.pp97-101.

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This paper presents enriched black hole algorithm (EBHA) for solving optimal reactive power problem. In this work black hole algorithm based on membrane computing is projected. In black hole algorithm evolution of the population is through pushing the candidates in the course of the most excellent candidate in iterations and black hole which swap with those in the search space. Membrane computing is also branded as P system and it has multisets of objects with evolution rules in the membrane structure. Membrane structure is alike ingrained tree of section that demarcate the areas, and root is

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Hirano, Shingo, Masahiro N. Machida, and Shantanu Basu. "Magnetic Effects Promote Supermassive Star Formation in Metal-enriched Atomic-cooling Halos." Astrophysical Journal 952, no. 1 (2023): 56. http://dx.doi.org/10.3847/1538-4357/acda94.

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Abstract Intermediate-mass black holes (with ≥105 M ⊙) are promising candidates for the origin of supermassive black holes (with ∼109 M ⊙) in the early universe (redshift z ∼ 6). Chon & Omukai first pointed out direct collapse black hole (DCBH) formation in metal-enriched atomic-cooling halos (ACHs), which relaxes the DCBH formation criterion. On the other hand, Hirano et al. showed that magnetic effects promote DCBH formation in metal-free ACHs. We perform a set of magnetohydrodynamical simulations to investigate star formation in magnetized ACHs with metallicities Z/Z ⊙ = 0, 10−5, and 10

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Bellinger, Earl P., Matt E. Caplan, Taeho Ryu, et al. "Solar Evolution Models with a Central Black Hole." Astrophysical Journal 959, no. 2 (2023): 113. http://dx.doi.org/10.3847/1538-4357/ad04de.

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Abstract Hawking proposed that the Sun may harbor a primordial black hole (BH) whose accretion supplies some of the solar luminosity. Such an object would have formed within the first 1 s after the Big Bang with the mass of a moon or an asteroid. These light BHs are a candidate solution to the dark matter problem, and could grow to become stellar-mass BHs if captured by stars. Here we compute the evolution of stars having such a BH at their center. We find that such objects can be surprisingly long-lived, with the lightest BHs having no influence over stellar evolution, while more massive ones

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Stathopoulos, S. I., M. Petropoulou, L. Sironi, and D. Giannios. "The role of magnetospheric current sheets in pair enrichment and ultra-high energy proton acceleration in M87*." Journal of Cosmology and Astroparticle Physics 2024, no. 12 (2024): 009. https://doi.org/10.1088/1475-7516/2024/12/009.

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Abstract Recent advances in numerical simulations of magnetically arrested accretion onto supermassive black holes have shed light on the formation and dynamics of magnetospheric current sheets near the black hole horizon. By considering the pair magnetization σ e in the upstream region and the mass accretion rate ṁ (in units of the Eddington mass accretion rate) as free parameters we estimate the strength of the magnetic field and develop analytical models, motivated by recent three-dimensional particle-in-cell simulations, to describe the populations of relativistic electrons and positrons (

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Chon, Sunmyon, and Kazuyuki Omukai. "Supermassive star formation via super competitive accretion in slightly metal-enriched clouds." Monthly Notices of the Royal Astronomical Society 494, no. 2 (2020): 2851–60. http://dx.doi.org/10.1093/mnras/staa863.

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ABSTRACT Direct collapse black hole (DCBH) formation with mass ≳105 M⊙ is a promising scenario for the origin of high-redshift supermassive black holes. It has usually been supposed that the DCBH can only form in the primordial gas since the metal enrichment enhances the cooling ability and causes the fragmentation into smaller pieces. What actually happens in such an environment, however, has not been explored in detail. Here, we study the impact of the metal enrichment on the clouds, conducting hydrodynamical simulations to follow the cloud evolution in cases with different degree of the met

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Metzger, Brian D., Lam Hui, and Matteo Cantiello. "Fragmentation in Gravitationally Unstable Collapsar Disks and Subsolar Neutron Star Mergers." Astrophysical Journal Letters 971, no. 2 (2024): L34. http://dx.doi.org/10.3847/2041-8213/ad6990.

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Abstract Although stable neutron stars (NSs) can in principle exist down to masses M ns ≈ 0.1 M ⊙, standard models of stellar core-collapse predict a robust lower limit M ns ≳ 1.2 M ⊙, roughly commensurate with the Chandrasekhar mass M Ch of the progenitor’s iron core (electron fraction Y e ≈ 0.5). However, this limit may be circumvented in sufficiently dense neutron-rich environments (Y e < 0.5) for which M Ch ∝ Y e 2 is reduced to ≲1 M ⊙. Such physical conditions could arise in the black hole accretion disks formed from the collapse of rapidly rotating stars (“collapsars”), as a result of

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Chon, Sunmyon, Takashi Hosokawa, and Kazuyuki Omukai. "Cosmological direct-collapse black hole formation sites hostile for their growth." Monthly Notices of the Royal Astronomical Society 502, no. 1 (2021): 700–713. http://dx.doi.org/10.1093/mnras/stab061.

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ABSTRACT The direct collapse (DC) is a promising mechanism that provides massive seed black holes (BHs) with ∼105 M⊙ in the early universe. To study a long-term accretion growth of a direct-collapse black hole (DCBH), we perform cosmological radiation-hydrodynamics simulations, extending our previous work where we investigated its formation stage. With a high spatial resolution down below the Bondi radius, we show that the accretion rate on to the BH is far below the Eddington value. Such slow mass growth is partly because of the strong radiative feedback from the accreting BH to the surroundi

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Park, Jongwon, Massimo Ricotti, and Kazuyuki Sugimura. "On the origin of outward migration of Population III stars." Monthly Notices of the Royal Astronomical Society 528, no. 4 (2024): 6895–914. http://dx.doi.org/10.1093/mnras/stae518.

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ABSTRACT Outward migration of massive binary stars or black holes in their circumbinary disc is often observed in simulations and it is key to the formation of wide black hole binaries. Using numerical simulations of Population III (Pop III) star formation, we study the angular momentum of Pop III binaries and the torques between stars and gas discs to understand the origin of outward migration and high ellipticity. The outward migration of protostars is produced by gravitational torques exerted on them by their circumstellar minidiscs. The minidiscs, on the other hand, migrate outward mainly

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Yang, Jinyi, Feige Wang, Xiaohui Fan, et al. "Probing Early Supermassive Black Hole Growth and Quasar Evolution with Near-infrared Spectroscopy of 37 Reionization-era Quasars at 6.3 < z ≤ 7.64." Astrophysical Journal 923, no. 2 (2021): 262. http://dx.doi.org/10.3847/1538-4357/ac2b32.

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Abstract We report the results of near-infrared spectroscopic observations of 37 quasars in the redshift range 6.3 < z ≤ 7.64, including 32 quasars at z > 6.5, forming the largest quasar near-infrared spectral sample at this redshift. The spectra, taken with Keck, Gemini, VLT, and Magellan, allow investigations of central black hole mass and quasar rest-frame ultraviolet spectral properties. The black hole masses derived from the Mg ii emission lines are in the range (0.3–3.6) × 109 M ⊙, which requires massive seed black holes with masses ≳103–104 M ⊙, assuming Eddington accretion since

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Irrgang, A., S. Geier, S. Kreuzer, I. Pelisoli, and U. Heber. "A stripped helium star in the potential black hole binary LB-1." Astronomy & Astrophysics 633 (January 2020): L5. http://dx.doi.org/10.1051/0004-6361/201937343.

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Context. The recently claimed discovery of a massive (MBH = 68−13+11 M⊙) black hole in the Galactic solar neighborhood has led to controversial discussions because it severely challenges our current view of stellar evolution. Aims. A crucial aspect for the determination of the mass of the unseen black hole is the precise nature of its visible companion, the B-type star LS V+22 25. Because stars of different mass can exhibit B-type spectra during the course of their evolution, it is essential to obtain a comprehensive picture of the star to unravel its nature and, thus, its mass. Methods. To th

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Sivaram, C. "Some constraints on quasar progenitors and quasar evolution." Symposium - International Astronomical Union 119 (1986): 417–18. http://dx.doi.org/10.1017/s0074180900153136.

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There is strong evidence that quasars are powered by the gravitational energy released by in fall of matter into a compact supermassive object which is most likely a black hole with mass M>106 to 109MO. The question then arises as to how such massive black holes came to be formed. What sort of objects were the progenitors? While looking for an answer we have to bear in mind another bit of intriguing evidence that even high Z quasars show lines of heavier elements (Oxygen, magnesium, etc) with solar abundances, strongly suggesting that matter had already undergone nuclear processing at even

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Umeda, Hideyuki, and Chris Nagele. "Metal-enriched Pair-instability Supernovae: Effects of Rotation." Astrophysical Journal 961, no. 2 (2024): 146. http://dx.doi.org/10.3847/1538-4357/ad140a.

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Abstract In this paper, we revisit metal-enriched rotating pair-instability supernovae (PISNe) models for metallicities consistent with the Small Magellanic Cloud, the Large Magellanic Cloud (LMC), and 0.1Z ⊙. By calculating multiple models, we intend to clarify mass ranges and the ejected 56Ni masses from the PISNe, and mass-loss histories for progenitors. We find that the choice of the Wolf–Rayet (WR) mass-loss rates is important, and we adopt the recently proposed rate of Sander & Vink, which covers the mass ranges for PISNe progenitors. We show that slow rotation lowers the PISN range

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Kamaleshwar, T., R. Lakshminarayanan, Yuvaraja Teekaraman, Ramya Kuppusamy, and Arun Radhakrishnan. "Self-Adaptive Framework for Rectification and Detection of Black Hole and Wormhole Attacks in 6LoWPAN." Wireless Communications and Mobile Computing 2021 (December 26, 2021): 1–8. http://dx.doi.org/10.1155/2021/5143124.

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Internet network communication protocol version 6 low-power wireless personal area networks (6LoWPAN) is supposed to assist the gadgets with low-power wireless sensor network (WSN) and it furnishes the top model layer of the data transmission system. The 6LoWPAN is prone to the diversified attacks such as wormhole and black hole attacks, which might be very difficult to become aware of and defend. In a wormhole attack, the attacker listens to the facts over the networks, and in a black hole attack, the intruder reprograms the nodes to dam the data transmission. As an end result, any data datag

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De Brito Silva, Danielle, Paula Jofré, Douglas Bourbert, Sergey E. Koposov, Jose L. Prieto, and Keith Hawkins. "J01020100−7122208: an accreted evolved blue straggler that was not ejected from a supermassive black hole." Monthly Notices of the Royal Astronomical Society 509, no. 3 (2021): 4637–52. http://dx.doi.org/10.1093/mnras/stab3364.

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ABSTRACT J01020100−7122208 is a star whose origin and nature still challenges us. It was first believed to be a yellow supergiant ejected from the Small Magellanic Cloud, but it was more recently claimed to be a red giant accelerated by the Milky Way’s central black hole. In order to unveil its nature, we analysed photometric, astrometric, and high-resolution spectroscopic observations to estimate the orbit, age, and 16 elemental abundances. Our results show that this star has a retrograde and highly-eccentric orbit, $e=0.914_{-0.020}^{+0.016}$. Correspondingly, it likely crossed the Galactic

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Nomura, Mariko, Kazuyuki Omukai, and Ken Ohsuga. "Radiation hydrodynamics simulations of line-driven AGN disc winds: metallicity dependence and black hole growth." Monthly Notices of the Royal Astronomical Society 507, no. 1 (2021): 904–13. http://dx.doi.org/10.1093/mnras/stab2214.

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ABSTRACT Growth of the black holes (BHs) from the seeds to supermassive BHs (SMBHs, $\sim \!10^9\, M_\odot$) is not understood, but the mass accretion must have played an important role. We performed 2D radiation hydrodynamics simulations of line-driven disc winds considering the metallicity dependence in a wide range of the BH mass, and investigated the reduction of the mass accretion rate due to the wind mass-loss. Our results show that denser and faster disc winds appear at higher metallicities and larger BH masses. The accretion rate is suppressed to ∼0.4–0.6 times the mass supply rate to

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Truong, Nhut, Annalisa Pillepich, Norbert Werner, et al. "X-ray signatures of black hole feedback: hot galactic atmospheres in IllustrisTNG and X-ray observations." Monthly Notices of the Royal Astronomical Society 494, no. 1 (2020): 549–70. http://dx.doi.org/10.1093/mnras/staa685.

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ABSTRACT Hot gaseous atmospheres that permeate galaxies and extend far beyond their stellar distribution, where they are commonly referred to as the circumgalactic medium, imprint important information about feedback processes powered by the stellar populations of galaxies and their central supermassive black holes (SMBHs). In this work, we study the properties of this hot X-ray emitting medium using the IllustrisTNG cosmological simulations. We analyse their mock X-ray spectra, obtained from the diffuse and metal-enriched gas in TNG100 and TNG50, and compare the results with X-ray observation

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Li, Jing, Yong Zhou, Yanjie Wang, et al. "Improving Humidity Sensing of Black Phosphorus Nanosheets by Co-Doping Benzyl Viologen and Au Nanoparticles." Journal of The Electrochemical Society 169, no. 1 (2022): 017513. http://dx.doi.org/10.1149/1945-7111/ac4b27.

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Black phosphorus (BP) is a two-dimensional and layered elemental semiconductor that is very sensitive to the subtle fluctuation of relative humidity (RH). However, the practical application of BP material was undesirably plagued by the irreversible degradation under moisture/oxygen atmospheres. To circumvent this limitation, here we prepared BP co-doped with benzyl viologen (BV) and Au nanoparticles as the sensing layer and explored the humidity-sensing performance at room temperature (20 °C). Unlike BP (BP-BV) counterparts, BP-Au (BP-BV-Au) sensors demonstrated unvaried response polarity with

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Mayer, Lucio, Pedro R. Capelo, Lorenz Zwick, and Tiziana Di Matteo. "Direct Formation of Massive Black Holes via Dynamical Collapse in Metal-enriched Merging Galaxies at z ∼ 10: Fully Cosmological Simulations." Astrophysical Journal 961, no. 1 (2024): 76. http://dx.doi.org/10.3847/1538-4357/ad11cf.

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Abstract We present the results of the first fully cosmological hydrodynamical simulations studying the merger-driven model for massive black hole (BH) seed formation via direct collapse. Using the zoom-in technique as well as particle splitting, we achieve a final spatial resolution of 2 pc. We show that the major merger of two massive galaxies at redshift z ∼ 8 results in the formation of a nuclear supermassive disk (SMD) of only 4 pc in radius, owing to a prodigious gas inflow sustained at 100–1000 M ⊙ yr−1. The core of the merger remnant is metal-rich, well above solar abundance, and the S

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Rozner, Mor, and Hagai B. Perets. "Binary Evolution, Gravitational-wave Mergers, and Explosive Transients in Multiple-population Gas-enriched Globular Clusters." Astrophysical Journal 931, no. 2 (2022): 149. http://dx.doi.org/10.3847/1538-4357/ac6d55.

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Abstract Most globular clusters (GCs) show evidence for multiple stellar populations, suggesting the occurrence of several distinct star formation episodes. The large fraction of second population (2P) stars observed requires a very large 2P gaseous mass to have accumulated in the cluster core to form these stars. Hence, the first population of stars (1P) in the cluster core has had to become embedded in 2P gas, just prior to the formation of later populations. Here we explore the evolution of binaries in ambient 2P gaseous media of multiple-population GCs. We mostly focus on black hole binari

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Rozner, Mor, and Hagai B. Perets. "Binary Evolution, Gravitational-wave Mergers, and Explosive Transients in Multiple-population Gas-enriched Globular Clusters." Astrophysical Journal 931, no. 2 (2022): 149. http://dx.doi.org/10.3847/1538-4357/ac6d55.

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Abstract Most globular clusters (GCs) show evidence for multiple stellar populations, suggesting the occurrence of several distinct star formation episodes. The large fraction of second population (2P) stars observed requires a very large 2P gaseous mass to have accumulated in the cluster core to form these stars. Hence, the first population of stars (1P) in the cluster core has had to become embedded in 2P gas, just prior to the formation of later populations. Here we explore the evolution of binaries in ambient 2P gaseous media of multiple-population GCs. We mostly focus on black hole binari

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Alsalme, Ali, Ahmed Najm, Nagy N. Mohammed, M. F. Abdel Messih, Ayman Sultan, and Mohamed Abdelhay Ahmed. "Rational Fabrication of Ag2S/g-C3N4 Heterojunction for Photocatalytic Degradation of Rhodamine B Dye Under Natural Solar Radiation." Catalysts 14, no. 12 (2024): 914. https://doi.org/10.3390/catal14120914.

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Near-infrared light-triggered photocatalytic water treatment has attracted significant attention in recent years. In this novel research, rational sonochemical fabrication of Ag2S/g-C3N4 nanocomposites with various compositions of Ag2S (0–25) wt% was carried out to eliminate hazardous rhodamine B dye in a cationic organic pollutant model. g-C3N4 sheets were synthesized via controlled thermal annealing of microcrystalline urea. However, black Ag2S nanoparticles were synthesized through a precipitation-assisted sonochemical route. The chemical interactions between various compositions of Ag2S an

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Pillepich, Annalisa, Dylan Nelson, Nhut Truong, et al. "X-ray bubbles in the circumgalactic medium of TNG50 Milky Way- and M31-like galaxies: signposts of supermassive black hole activity." Monthly Notices of the Royal Astronomical Society 508, no. 4 (2021): 4667–95. http://dx.doi.org/10.1093/mnras/stab2779.

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ABSTRACT The TNG50 cosmological simulation produces X-ray emitting bubbles, shells, and cavities in the circumgalactic gas above and below the stellar discs of Milky Way- and Andromeda-like galaxies with morphological features reminiscent of the eROSITA and Fermi bubbles in the Galaxy. Two-thirds of the 198 MW/M31 analogues inspected in TNG50 at z = 0 show one or more large-scale, coherent features of overpressurized gas that impinge into the gaseous halo. Some of the galaxies include a succession of bubbles or shells of increasing size, ranging from a few to many tens of kpc. These are promin

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Wang, Shu, Linhua Jiang, Yue Shen, et al. "Metallicity in Quasar Broad-line Regions at Redshift ∼ 6." Astrophysical Journal 925, no. 2 (2022): 121. http://dx.doi.org/10.3847/1538-4357/ac3a69.

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Abstract Broad-line regions (BLRs) in high-redshift quasars provide crucial information on chemical enrichment in the early universe. Here we present a study of BLR metallicities in 33 quasars at redshift 5.7 < z < 6.4. Using the near-IR spectra of the quasars obtained from the Gemini telescope, we measure their rest-frame UV emission-line flux and calculate flux ratios. We then estimate BLR metallicities with empirical calibrations based on photoionization models. The inferred median metallicity of our sample is a few times the solar value, indicating that the BLR gas had been highly me

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Russell, Helen R., Laura A. Lopez, Steven W. Allen, et al. "The Evolution of Galaxies and Clusters at High Spatial Resolution with Advanced X-ray Imaging Satellite (AXIS)." Universe 10, no. 7 (2024): 273. http://dx.doi.org/10.3390/universe10070273.

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Stellar and black hole feedback heat and disperse surrounding cold gas clouds, launching gas flows off circumnuclear and galactic disks, producing a dynamic interstellar medium. On large scales bordering the cosmic web, feedback drives enriched gas out of galaxies and groups, seeding the intergalactic medium with heavy elements. In this way, feedback shapes galaxy evolution by shutting down star formation and ultimately curtailing the growth of structure after the peak at redshift 2–3. To understand the complex interplay between gravity and feedback, we must resolve both the key physics within

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Carolina, Sparavigna Amelia. "Dimensional Equations of Entropy." International Journal of Sciences Volume 4, no. 2015-08 (2015): 1–7. https://doi.org/10.5281/zenodo.3348985.

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Entropy is a quantity which is of great importance in physics and chemistry. The concept comes out of thermodynamics, proposed by Rudolf Clausius in his analysis of Carnot cycle and linked by Ludwig Boltzmann to the number of specific ways in which a physical system may be arranged. Any physics classroom, in its task of learning physics, has therefore to face this crucial concept. As we will show in this paper, the lectures can be enriched by discussing dimensional equations linked to the entropy of some physical systems.Read Complete Article at ijSciences: V4201508811 AND DOI: http://dx.doi.o

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Ciotti, Luca, Jeremiah P. Ostriker, Zhaoming Gan, et al. "A Parameter Space Exploration of High-resolution Numerically Evolved Early Type Galaxies Including AGN Feedback and Accurate Dynamical Treatment of Stellar Orbits." Astrophysical Journal 933, no. 2 (2022): 154. http://dx.doi.org/10.3847/1538-4357/ac70c7.

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Abstract An extensive exploration of the model parameter space of axisymmetric early type galaxies (ETGs) hosting a central supermassive black hole (SMBH) is conducted by means of high-resolution hydrodynamical simulations performed with our code MACER. Global properties such as (1) total SMBH accreted mass, (2) final X-ray luminosity and temperature of the X-ray emitting halos, (3) total amount of new stars formed from the cooling gas, and (4) total ejected mass in the form of supernovae and active galactic nuclei (AGN) feedback induced galactic winds, are obtained as a function of galaxy str

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Johnson, Sean D., Zhuoqi (Will) Liu, Jennifer I.-Hsiu Li, et al. "Discovery of Optically Emitting Circumgalactic Nebulae around the Majority of UV-luminous Quasars at Intermediate Redshift." Astrophysical Journal 966, no. 2 (2024): 218. http://dx.doi.org/10.3847/1538-4357/ad3911.

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Abstract We report the discovery of large, ionized, [O ii]-emitting circumgalactic nebulae around the majority of 30 UV-luminous quasars at z = 0.4–1.4 observed with deep, wide-field integral field spectroscopy with the Multi-Unit Spectroscopy Explorer (MUSE) by the Cosmic Ultraviolet Baryon Survey and MUSE Quasar Blind Emitters Survey. Among the 30 quasars, seven (23%) exhibit [O ii]-emitting nebulae with major axis sizes greater than 100 kpc, 20 greater than 50 kpc (67%), and 27 (90%) greater than 20 kpc. Such large, optically emitting nebulae indicate that cool, dense, and metal-enriched ci

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Sanchez, N. Nicole, Jessica K. Werk, Michael Tremmel, et al. "Not So Heavy Metals: Black Hole Feedback Enriches the Circumgalactic Medium." Astrophysical Journal 882, no. 1 (2019): 8. http://dx.doi.org/10.3847/1538-4357/ab3045.

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Omukai, K., R. Schneider, and Z. Haiman. "Can Supermassive Black Holes Form in Metal‐enriched High‐Redshift Protogalaxies?" Astrophysical Journal 686, no. 2 (2008): 801–14. http://dx.doi.org/10.1086/591636.

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Guiglion, G., P. de Laverny, A. Recio-Blanco, and N. Prantzos. "The AMBRE Project: r-process elements in the Milky Way thin and thick discs." Astronomy & Astrophysics 619 (November 2018): A143. http://dx.doi.org/10.1051/0004-6361/201833782.

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Context. The chemical evolution of neutron capture elements in the Milky Way disc is still a matter of debate. There is a lack of statistically significant catalogues of such element abundances, especially those of the r-process. Aims. We aim to understand the chemical evolution of r-process elements in Milky Way disc. We focus on three pure r-process elements Eu, Gd, and Dy. We also consider a pure s-process element, Ba, in order to disentangle the different nucleosynthesis processes. Methods. We take advantage of high-resolution FEROS, HARPS, and UVES spectra from the ESO archive in order to

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Voloshin, V.V. "APPLIED PHILOSOPHY: EPISTEMOLOGICAL STRUCTURE OF SCIENCE AND BLACK HOLES." Bulletin of Donetsk National University. Series B. Humanities, no. 1 (November 5, 2024): 24–35. https://doi.org/10.5281/zenodo.14192577.

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The present article substantiates the point about applied nature of philosophy of science. The argument consists in the proposition about interaction between levels and forms of both scientific knowledge and cognition, which enrich and stimulate each other. Acceptability of this statement is demonstrated by means of the example dealing with exploration of black holes. It is stated that there is no substantially exhaustive and empirically corroborated theory of black holes, but it is compensated by existing heuristic scientific problems and coherent hypotheses. The author argues that exploratio

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Collin, Suzy, and Jean-Marc Huré. "11.5. Pregalactic production of heavy elements by quasars." Symposium - International Astronomical Union 184 (1998): 465–66. http://dx.doi.org/10.1017/s0074180900085594.

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We address the following questions. Is it possible that the heavy elements observed in high redshift quasars are formed in the vicinity of the black hole? And in this case do quasars produce, mainly during their growing phase, the first heavy elements which enrich the intergalactic medium and the protogalaxies?

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Boland, John M. "The impact of an invasive ambrosia beetle on the riparian habitats of the Tijuana River Valley, California." PeerJ 4 (June 21, 2016): e2141. http://dx.doi.org/10.7717/peerj.2141.

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The Tijuana River Valley is the first natural habitat in California to be substantially invaded by the Kuroshio Shot Hole Borer (KSHB,Euwallaceasp.), an ambrosia beetle native to Southeast Asia. This paper documents the distribution of the KSHB in the riparian vegetation in the valley and assesses the damage done to the vegetation as of early 2016, approximately six months after the beetle was first observed in the valley. I divided the riparian habitats into 29 survey units so that the vegetation within each unit was relatively homogenous in terms of plant species composition, age and density

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Wang, Zhenghan. "Beyond anyons." Modern Physics Letters A 33, no. 28 (2018): 1830011. http://dx.doi.org/10.1142/s0217732318300112.

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The theory of anyon systems, as modular functors topologically and unitary modular tensor categories algebraically, is mature. To go beyond anyons, our first step is the interplay of anyons with conventional group symmetry due to the paramount importance of group symmetry in physics. This led to the theory of symmetry-enriched topological order. Another direction is the boundary physics of topological phases, both gapless as in the fractional quantum Hall physics and gapped as in the toric code. A more speculative and interesting direction is the study of Banados–Teitelboim–Zanelli (BTZ) black

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Gao, Jianfei, Kangning Xiong, Wei Zhou, and Weijie Li. "Extensive Metabolite Profiling in the Unexploited Organs of Black Tiger for Their Potential Valorization in the Pharmaceutical Industry." Life 11, no. 6 (2021): 544. http://dx.doi.org/10.3390/life11060544.

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Black tiger (Kadsura coccinea (Lem.)) has been reported to hold enormous pharmaceutical potential. The fruit and rhizome of black tiger are highly exploited in the pharmaceutical and other industries. However, the most important organs from the plant such as the leaf and stem are considered biowastes mainly because a comprehensive metabolite profile has not been reported in these organs. Knowledge of the metabolic landscape of the unexploited black tiger organs could help identify and isolate important compounds with pharmaceutical and nutritional values for a better valorization of the specie

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Guo, Xiaoyang, and Xinzhi Xie. "Planck Formula for Black-body Radiation: Derivation and Applications." Highlights in Science, Engineering and Technology 64 (August 21, 2023): 200–204. http://dx.doi.org/10.54097/hset.v64i.11280.

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At the end of the 19th century, German physicist Victor Brooks first proposed black hole radiation. He found that objects emit electromagnetic waves when they are heated. Brooks found that the spectral density of electromagnetic waves is proportional to the temperature of the body, which is called blackbody radiation. The research of blackbody radiation began in the middle of the 19th century, studying radiator and radiation standards to meet the needs of industrial applications. The experimental results show that, especially by interpreting the spectral distribution of Planck's formula, many

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Mayer, Lucio, Davide Fiacconi, Silvia Bonoli, et al. "DIRECT FORMATION OF SUPERMASSIVE BLACK HOLES IN METAL-ENRICHED GAS AT THE HEART OF HIGH-REDSHIFT GALAXY MERGERS." Astrophysical Journal 810, no. 1 (2015): 51. http://dx.doi.org/10.1088/0004-637x/810/1/51.

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Prochaska, J. Xavier, Jean-Pierre Macquart, Matthew McQuinn, et al. "The low density and magnetization of a massive galaxy halo exposed by a fast radio burst." Science 366, no. 6462 (2019): 231–34. http://dx.doi.org/10.1126/science.aay0073.

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Present-day galaxies are surrounded by cool and enriched halo gas extending for hundreds of kiloparsecs. This halo gas is thought to be the dominant reservoir of material available to fuel future star formation, but direct constraints on its mass and physical properties have been difficult to obtain. We report the detection of a fast radio burst (FRB 181112), localized with arcsecond precision, that passes through the halo of a foreground galaxy. Analysis of the burst shows that the halo gas has low net magnetization and turbulence. Our results imply predominantly diffuse gas in massive galact

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Park, KwangHo, Gen Chiaki, and John H. Wise. "Accelerated Growth of Seed Black Holes by Dust in the Early Universe." Astrophysical Journal 936, no. 2 (2022): 116. http://dx.doi.org/10.3847/1538-4357/ac886c.

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Abstract We explore the effect of dust on the growth of seed black holes (BHs) in the early universe. Previous 1D radiation-hydrodynamic (RHD) simulations show that increased radiation pressure on dust further suppresses the accretion rate than the case for the chemically pristine gas. Using the Enzo+Moray code, we perform a suite of 3D RHD simulations of accreting BHs in a dusty interstellar medium (ISM). We use the modified Grackle cooling library to consider dust physics in its nonequilibrium chemistry. The BH goes through an early evolutionary phase, where ionizing BH radiation creates an

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Lu, Zhiyi. "Analysis of the Principle and State-of-art Applications of Astronomical Telescope." Highlights in Science, Engineering and Technology 72 (December 15, 2023): 83–89. http://dx.doi.org/10.54097/4kna8f33.

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Astronomical telescopes have been instrumental in enhancing our comprehension of the cosmos since ancient eras. This study explores these remarkable instruments' principles and state-of-art applications, tracing their development from early refracting telescopes to modern space and ground-based telescopes. The primary focus is to analyze the imaging principles of optical and radio telescopes and showcase their significance in capturing high-resolution observations of celestial objects. It also highlights recent achievements made by advanced telescopes, including the James Webb Space Telescope

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Bassini, L., E. Rasia, S. Borgani, et al. "Black hole mass of central galaxies and cluster mass correlation in cosmological hydro-dynamical simulations." Astronomy & Astrophysics 630 (October 2019): A144. http://dx.doi.org/10.1051/0004-6361/201935383.

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Context. The correlations between the properties of the brightest cluster galaxy (BCG) and the mass of its central super-massive black hole (SMBH) have been extensively studied from a theoretical and observational angle. More recently, relations connecting the SMBH mass and global properties of the hosting cluster, such as temperature and mass, were observed. Aims. We investigate the correlation between SMBH mass and cluster mass and temperature, their establishment and evolution. We compare their scatter to that of the classical MBH − MBCG relation. Moreover, we study how gas accretion and BH

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Clark III, Edgar “Trey.” "Protest as Preaching. The Pneumatic Proclamation of Black Lives Matter." International Journal of Homiletics, Suppl.II (August 31, 2021): 43–52. http://dx.doi.org/10.21827/ijh.2021.39517.

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This article explores some of the recent protests in support of Black Lives Matter from a homiletical perspective. Specifically, the author argues that these protests reflect a non-traditional form of pneumatic or Spirit-inspired proclamation that can enrich the church’s preaching in a time of crisis. The article is arranged into three sections. First, a pneumatological framing of proclamation is proffered in order to interpret protest as a mode of Spirit-inspired preaching. Second, drawing on the author’s experience as a participant-observer in select protests in Southern California, three sn

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Zhang, Bing, Wenbo Jiang, Haifeng Zhang, and Yongsheng An. "Optimization Design of Deep-Coalbed Methane Deliquification in the Linxing Block, China." Processes 12, no. 7 (2024): 1318. http://dx.doi.org/10.3390/pr12071318.

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The production of deep-coalbed methane (CBM) wells undergoes four stages sequentially: drainage depressurization, unstable gas production, stable gas production, and gas production decline. Upon entering the stable production stage, the recovery rate of deep CBM wells is constrained by bottom hole flowing pressure (BHFP). Reducing BHFP can further optimize CBM productivity, significantly increasing the production and recovery rate of CBM wells. This paper optimizes the deliquification process for deep CBM in the Linxing Block. By analyzing the production of deep CBM wells, an improved sucker r

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De Donder, Erwin, and Dany Vanbeveren. "The effect of close binary evolution on the chemical enrichment of galaxies." Symposium - International Astronomical Union 193 (1999): 738. http://dx.doi.org/10.1017/s0074180900206669.

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During their various evolutionary phases, stars enrich the interstellar gas (ISG) with chemical elements. In our study we investigate the effect of binaries on the chemical enrichment of the ISG. To derive the true yields for a population of single and binary stars we use a Population Number Synthesis code which is described in detail in Vanbeveren et al. (1998). We account for the enrichment through stellar wind (SW), supernova explosion (SN) of single and binary stars including type Ia, planetary nebula (PN), and through binary interaction (BI). When black hole (BH) formation occurs, it is a

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Islami, Titik. "PENGGUNAAN BIOCHAR DIPERKAYA NITROGEN PADA TANAMAN JAGUNG." BUANA SAINS 19, no. 1 (2019): 17. http://dx.doi.org/10.33366/bs.v19i1.1523.

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Most agricultural land in lndonesia has a low organic matter content, and this is due to the fast decomposition rate of soil organic matter. The rapid decomposition of soil organic matter causes low soil fertility. To maintain high agricultural yields, it is necessary to add soil organic matter repeatedly in each planting season with a high dose (> 10 tons / ha). Farmers considered that the addition of high-dose organic matter to their agricultural land is not economical and difficult to do. Therefore, soil organic matters which is resistant to decomposition is needed, so that it can last l

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Jara-Ferreira, F., P. B. Tissera, E. Sillero, et al. "The metallicity gradients of star-forming regions store information of the assembly history of galaxies." Monthly Notices of the Royal Astronomical Society 530, no. 2 (2024): 1369–85. http://dx.doi.org/10.1093/mnras/stae708.

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ABSTRACT The variations in metallicity and spatial patterns within star-forming regions of galaxies result from diverse physical processes unfolding throughout their evolutionary history, with a particular emphasis on recent events. Analysing MaNGA and EAGLE galaxies, we discovered an additional dependence of the mass–metallicity relation (MZR) on metallicity gradients (∇(O/H)). Two regimes emerged for low- and high-stellar mass galaxies, distinctly separated at approximately M⋆ &gt; 109.75$\rm{M}_{\odot}$. Low-mass galaxies with strong positive ∇(O/H) appear less enriched than the MZR med

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