Results 281 to 288 of about 159,631 (288)

Supermassive Primordial Black Holes for Nano-Hertz Gravitational Waves and High-redshift JWST Galaxies

Research in Astronomy and Astrophysics
Recently, observational hints for supermassive black holes have been accumulating, prompting the question: Can primordial black holes (PBHs) be supermassive, particularly with masses M ≳ 109 M ⊙?
Hai-Long Huang, Yong Cai, Jun-Qian Jiang, Jun Zhang, Yun-Song Piao   +4 more
semanticscholar   +1 more source

A new class of flares from accreting supermassive black holes

Nature Astronomy, 2019
Accreting supermassive black holes (SMBHs) can exhibit variable emission across the electromagnetic spectrum and over a broad range of timescales. The variability of active galactic nuclei (AGNs) in the ultraviolet and optical is usually at the few tens ...
B. Trakhtenbrot, I. Arcavi, C. Ricci, S. Tacchella, D. Stern, H. Netzer, P. Jonker, A. Horesh, J. Mejía-restrepo, G. Hosseinzadeh, Valentina Hallefors, D. Howell, C. McCully, M. Baloković, M. Heida, N. Kamraj, G. Lansbury, Ł. Wyrzykowski, M. Gromadzki, A. Hamanowicz, S. Cenko, D. Sand, E. Hsiao, M. Phillips, T. Diamond, E. Kara, K. Gendreau, Z. Arzoumanian, R. Remillard   +28 more
semanticscholar   +1 more source

Inward Bound—The Search for Supermassive Black Holes in Galactic Nuclei

, 1995
Dynamical searches reveal central dark objects with masses"" 106 to 109.5 M0 in the Galaxy, M31, M32, M87, NGC 3115, NGC 3377, NGC 4258, and NGC 4594. Indirect arguments suggest but do not prove that these are supermassive black holes (BHs) like those ...
J. Kormendy, D. Richstone
semanticscholar   +1 more source

The effect of nuclear gas distribution on the mass determination of supermassive black holes

, 2017
Supermassive black holes reside in the nuclei of most galaxies. During their active episodes, black holes are powered by accretion discs where gravitational energy is converted into radiation1.
J. Mejía-restrepo, P. Lira, H. Netzer, B. Trakhtenbrot, D. Capellupo   +4 more
semanticscholar   +1 more source

Supermassive black holes

2018
AbstractThe supermassive BH at the center of our Galaxy. Formation and evolution of SMBH binaries. Perspective for detection with LISA. Extreme mass ratio inspirals (EMRIs). Computation of the EMRI’s waveform with the self-force approach. Stochastic backgrounds of gravitational waves produced by SMBH binaries. Perspective for detection at pulsar timing
openaire   +1 more source

Supermassive Black Holes in Quasars

AIP Conference Proceedings, 2006
Computing the basic accretion parameters for the supermassive black holes expected to be present in quasars is still a major challenge. In this paper we stress how a systematization of observational properties through the so‐called “eigenvector 1” of quasars helps to develop a clearer view of the structure and dynamics of the Broad Line Region ...
Jack W. Sulentic, Paola Marziani, Deborah Dultzin-Hacyan   +2 more
openaire   +2 more sources

Supermassive Black Holes and Their Host Galaxies

Publications of the Astronomical Society of the Pacific, 2008
n ...
openaire   +2 more sources

Tidal Disruption of Stars by Supermassive Black Holes

, 2015
Nicholas C. Stone
semanticscholar   +1 more source