Results 31 to 40 of about 182 (138)
Growth of supermassive black holes and metallicity in quasars [PDF]
Astronomy & Astrophysics, 2001 Accepted by A&A Letters, 4 pages in aa.cls, no figures and no ...
openaire +2 more sources
High-redshift quasars and the supermassive black hole mass budget: constraints on quasar formation models [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 19 pages, 6 figures, 1 table. v2: Corrected references. v3: Extended Section 5.1, corrected Section 3.2, various other corrections and additions suggested by referee.
Bromley, J. M. +2 more
openaire +2 more sources
Downsizing of supermassive black holes from the SDSS quasar survey [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 Starting from the ~50000 quasars of the Sloan Digital Sky Survey for which MgII line width and 3000 A monochromatic flux are available, we aim to study the dependence of the mass of active black holes on redshift. We focus on the observed distribution in the FWHM - nuclear luminosity plane, which can be reproduced at all redshifts assuming a limiting ...
Labita M. +3 more
openaire +2 more sources
Methods for identifying high‐redshift galaxy cluster candidates
Astronomische Nachrichten, Volume 340, Issue 7, Page 618-621, August 2019., 2019 Abstract Recent theories linked long gamma ray bursts (GRBs) to galaxies with rapid star formation or starburst; thus, we expect that long GRBs (LGRBs) are more frequent in midcluster galaxies where mergers and tidal interactions between gas‐rich galaxies are more likely to occur. Yet there is no galaxy cluster known to be associated with LGRBs.
Sandor Pinter +5 more
wiley +1 more source
Modeling the Central Supermassive Black Holes Mass of Quasars via LSTM Approach
CoRR, 2023 15 pages, 5 ...
Seyed Sajad Tabasi +3 more
openaire +3 more sources
Advances in High Energy Physics, Volume 2019, Issue 1, 2019., 2019 Based on Reissner‐Nordstrom‐anti‐de Sitter(RN‐AdS) black hole surrounded by perfect fluid dark matter, we study the thermodynamics and phase transition by extending the phase space defined by the charge square Q2 and the conjugate quantity ψ, where ψ is a function of horizon radius.
Zhaoyi Xu +4 more
wiley +1 more source
Quasars: a supermassive rotating toroidal black hole interpretation [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 A supermassive rotating toroidal black hole (TBH) is proposed as the fundamental structure of quasars and other jet-producing active galactic nuclei. Rotating protogalaxies gather matter from the central gaseous region leading to the birth of massive toroidal stars whose internal nuclear reactions proceed very rapidly.
openaire +2 more sources
Growth of Accreting Supermassive Black Hole Seeds and Neutrino Radiation
Journal of Astrophysics, Volume 2015, Issue 1, 2015., 2015 In the framework of microscopic theory of black hole (MTBH), which explores the most important processes of rearrangement of vacuum state and spontaneous breaking of gravitation gauge symmetry at huge energies, we have undertaken a large series of numerical simulations with the goal to trace an evolution of the mass assembly history of 377 plausible ...
Gagik Ter-Kazarian, Gary Wegner
wiley +1 more source
QSONG: Supermassive Black Holes in Quasars at World's End [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractWe present the initial results of the AKARI mission program QSONG (Quasar Spectroscopic Observation with NIR Grism). QSONG utilizes the unique AKARI capability of performing spectroscopic observations at 2.5–5 μm, with the aim of understanding the mass evolution of ~200 quasars at 3.4 < z < 6.5 from their rest-frame optical spectra.
openaire +1 more source
The Natural Science Underlying Big History
The Scientific World Journal, Volume 2014, Issue 1, 2014., 2014 Nature’s many varied complex systems—including galaxies, stars, planets, life, and society—are islands of order within the increasingly disordered Universe. All organized systems are subject to physical, biological, or cultural evolution, which together comprise the grander interdisciplinary subject of cosmic evolution.
Eric J. Chaisson, Lukas Kratochvil
wiley +1 more source