Results 71 to 80 of about 5,650 (230)

Emergence of cHz Quasiperiodic Oscillations from a Low-angular-momentum Flow onto a Supermassive Black Hole

The Astrophysical Journal Letters
Quasiperiodic oscillations (QPOs) are very common in black hole accretion systems that are seen from the modulations in luminosity. Many supermassive black hole sources (e.g., RE J1034+396, 1H 0707-495, MCG-6-30-15, 1ES 1927+654, Sgr A*) have been ...
Indu K. Dihingia, Yosuke Mizuno
doaj   +1 more source

Evolution of black hole shadow in the presence of ultralight bosons

Physics Letters B, 2020
Kerr black holes coupled to quantized bosonic fields display a special version of the Hawking effect, governed by the superradiance condition. This leads to rapid growth of boson cloud through spontaneous creation, leading to slowing down of the black ...
Rittick Roy, Urjit A. Yajnik
doaj   +1 more source

Dual Supermassive Black Holes at Close Separation Revealed by the Hyper Suprime-Cam Subaru Strategic Program [PDF]

, 2020
J. D. Silverman, Shenli Tang, Khee‐Gan Lee, Tilman Hartwig, Andy D. Goulding, Michael A. Strauss, Malte Schramm, Xuheng Ding, Rogemar A. Riffel, Seiji Fujimoto, Chiaki Hikage, Masatoshi Imanishi, K. Iwasawa, K. Jahnkę, Issha Kayo, Nobunari Kashikawa, Toshihiro Kawaguchi, Kotaro Kohno, Wentao Luo, Yoshiki Matsuoka, Yuichi Matsuda, Tohru Nagao, Masamune Oguri, Yoshiaki Ono, Masafusa Onoue, Masami Ouchi, Kazuhiro Shimasaku, Hyewon Suh, N. Suzuki, Yoshiaki Taniguchi, Yoshiki Toba, Yoshihiro Ueda, Naoki Yasuda   +32 more
openalex   +1 more source

A VLBI Proper Motion Analysis of the Recoiling Supermassive Black Hole Candidate Mrk 1018 [PDF]

, 2023
Gregory J. Walsh, Sarah Burke-Spolaor, T. Joseph W. Lazio   +2 more
openalex   +1 more source

Primordial black holes as supermassive black hole seeds

Journal of Cosmology and Astroparticle Physics
Abstract The presence of supermassive black holes (SMBHs, M • ∼ 106-10 M ⊙) in the first cosmic Gyr (z ≳ 6) challenges current models of BH formation and evolution. We propose a novel mechanism for the formation of early SMBH seeds based on primordial black holes (PBHs).
F. Ziparo, S. Gallerani, A. Ferrara
openaire   +2 more sources

The spin of supermassive black holes [PDF]

Classical and Quantum Gravity, 2013
Invited article accepted for publication in the focus issue on astrophysical black holes in Classical and Quantum Gravity, guest editors: D. Merritt and L. Rezzolla.
openaire   +2 more sources

Enhancing the rate of tidal disruptions of stars by a self-gravitating disc around a massive central black hole

EPJ Web of Conferences, 2012
We further study the idea that a self-gravitating accretion disc around a supermassive black hole can increase the rate of gradual orbital decay of stellar trajectories (and hence tidal disruption events) by setting some stars on eccentric trajectories ...
Šubr L., Karas V.
doaj   +1 more source

Relativistic Aspects of Accreting Supermassive Black Hole Binaries in Their Natural Habitat: A Review

Galaxies, 2019
In this review a summary is given on recent theoretical work, on understanding accreting supermassive black hole binaries in the gravitational wave (GW)-driven regime. A particular focus is given to theoretical predictions of properties of disks and jets
Roman Gold
doaj   +1 more source

Strong deflection gravitational lensing by a modified Hayward black hole

European Physical Journal C: Particles and Fields, 2017
A modified Hayward black hole is a nonsingular black hole. It is proposed that it would form when the pressure generated by quantum gravity can stop matter’s collapse as the matter reaches the Planck density.
Shan-Shan Zhao, Yi Xie
doaj   +1 more source

Emission Signatures from Subparsec Binary Supermassive Black Holes. III. Comparison of Models with Observations [PDF]

, 2020
Khai Nguyen, Tamara Bogdanović, Jessie C. Runnoe, Michael Eracleous, Steinn Sigurðsson, Todd A. Boroson   +5 more
openalex   +1 more source