M94 as a Unique Testbed for Black Hole Mass Estimates and AGN Activity at Low Luminosities
Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012 We discuss the peculiar nature of the nucleus of M94 (NGC 4736) in the context of new measurements of the broad Hα emission from HST‐STIS observations. We show that this component is unambiguously associated with the high‐resolution X‐ray, radio, and variable UV sources detected at the optical nucleus of this galaxy.
Anca Constantin +2 more
wiley +1 more source
Stellar Disruption by Supermassive Black Holes and the Quasar Radio Loudness Dichotomy [PDF]
The Astrophysical Journal, 2008 The origin of the dichotomy of radio loudness among quasars can be explained using recent findings that the mass of the central supermassive black hole (SMBH) in extended radio-loud quasars is systematically a few times that of their counterparts in radio-quiet quasars.
null Gopal-Krishna +2 more
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BLACK HOLE MASS ESTIMATES AND RAPID GROWTH OF SUPERMASSIVE BLACK HOLES IN LUMINOUSz∼ 3.5 QUASARS [PDF]
The Astrophysical Journal, 2015 We present new near-infrared (IR) observations of the H$β \lambda4861$ and MgII $\lambda2798$ lines for 32 luminous quasars with $3 ...
Zuo, Wenwen +5 more
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A simple model for the evolution of supermassive black holes and the quasar population [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 An empirically motivated model is presented for accretion-dominated growth of the super massive black holes (SMBH) in galaxies, and the implications are studied for the evolution of the quasar population in the universe. We investigate the core aspects of the quasar population, including space density evolution, evolution of the characteristic ...
Mahmood, A, Devriendt, J, Silk, J
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Modeling the Central Supermassive Black Hole Mass of Quasars via the LSTM Approach
The Astrophysical Journal, 2023 Abstract One of the fundamental questions about quasars is related to their central supermassive black holes. The reason for the existence of these black holes with such a huge mass is still unclear, and various models have been proposed to explain them.
Seyed Sajad Tabasi +3 more
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Accretion around Supermassive Black Holes: The Detection of the Balmer Edge Signature from Quasars [PDF]
Progress of Theoretical Physics Supplement, 2004 The ultraviolet/optical continuum of quasars is thought to be from an accretion flow around a supermassive black hole, and it dominates the radiative output of quasars. However, the nature of this emission, often called the Big Blue Bump, has not been well understood.
Kishimoto, Makoto +3 more
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A PROBABLE MILLI-PARSEC SUPERMASSIVE BINARY BLACK HOLE IN THE NEAREST QUASAR MRK 231 [PDF]
The Astrophysical Journal, 2015 a typo in equation (2) and also in equation (5) of the Appendix is fixed; 9 pages, 7 ...
Chang-Shuo Yan +3 more
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CONSTRAINING SUB-PARSEC BINARY SUPERMASSIVE BLACK HOLES IN QUASARS WITH MULTI-EPOCH SPECTROSCOPY. I. THE GENERAL QUASAR POPULATION [PDF]
The Astrophysical Journal, 2013 replaced with accepted version; ApJ, in ...
Shen, Yue +3 more
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Probing the Coevolution of Supermassive Black Holes and Quasar Host Galaxies
The Astrophysical Journal, 2006 At low redshift, there are fundamental correlations between the mass of supermassive black holes (MBH) and the mass (Mbulge) and luminosity of the host galaxy bulge. We investigate the same relation at z>=1. Using virial mass estimates for 11 quasars at z >~2 to measure their black hole mass, we find that black holes at high z fall nearly on the ...
Peng, Chien Y. +4 more
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Photometry of three gamma-ray-loud quasars and implications for supermassive black holes [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 The results of photometry of three gamma-ray-loud quasars, PKS 1510-089, 3C 279 and OJ248, during 2001 in the B, V and R bands and implications for the supermassive black hole (SMBH) model in these objects are presented. The results show that the three quasars had significant, but irregular, rapid outbursts with a typical time-scale of about 40-60 min ...
G. Z. Xie +5 more
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