Results 11 to 20 of about 166,156 (289)
Investigating strong gravitational lensing effects by supermassive black holes with Horndeski gravity [PDF]
European Physical Journal C: Particles and Fields, 2022 We study gravitational lensing in strong-field limit by a static spherically symmetric black hole in quartic scalar field Horndeski gravity having additional hair parameter q, evading the no-hair theorem.
Jitendra Kumar +2 more
doaj +2 more sources
Supermassive primordial black holes from inflation [PDF]
Journal of Cosmology and Astroparticle Physics, 2023 Abstract There is controversy surrounding the origin and evolution of our universe's largest supermassive black holes (SMBHs). In this study, we consider the possibility that some of these black holes formed from the direct collapse of primordial density perturbations.
Dan Hooper +3 more
openaire +3 more sources
Signals of merging supermassive black holes in pulsar timing arrays [PDF]
Physical Review Research, 2023 In this work we evaluate whether the gravitational wave background recently observed by a number of different pulsar timing arrays could be due to merging supermassive black hole binaries. We find that for homogeneously distributed primordial black holes
Paul Frederik Depta +3 more
semanticscholar +1 more source
The ASTRID simulation: the evolution of Supermassive Black Holes [PDF]
, 2021 We present the evolution of black holes (BHs) and their relationship with their host galaxies in Astrid, a large-volume cosmological hydrodynamical simulation with box size 250 $h^{-1} \rm Mpc$ containing $2\times5500^3$ particles evolved to z=3.
Y. Ni +8 more
semanticscholar +1 more source
Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays [PDF]
Astrophysical Journal, 2020 The production and acceleration mechanisms of ultrahigh-energy cosmic rays (UHECRs) of energy >1020 eV, clearly beyond the GZK cutoff limit, remain unclear, which points to the exotic nature of the phenomena.
A. Tursunov +4 more
semanticscholar +1 more source
Seeding Supermassive Black Holes with Self-interacting Dark Matter: A Unified Scenario with Baryons [PDF]
Astrophysical Journal Letters, 2020 Observations show that supermassive black holes (SMBHs) with a mass of ∼109 M ⊙ exist when the universe is just 6% of its current age. We propose a scenario where a self-interacting dark matter halo experiences gravothermal instability and its central ...
Wei-Xiang Feng, Hai-Bo Yu, Yi-Ming Zhong
semanticscholar +1 more source
Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies [PDF]
, 2013 Supermassive black holes (BHs) have been found in 85 galaxies by dynamical modeling of spatially resolved kinematics. The Hubble Space Telescope revolutionized BH research by advancing the subject from its proof-of-concept phase into quantitative studies
J. Kormendy, L. Ho
semanticscholar +1 more source
A Fundamental Relation between Supermassive Black Holes and Their Host Galaxies [PDF]
, 2000 The masses of supermassive black holes correlate almost perfectly with the velocity dispersions of their host bulges, Mbh ∝ σα, where α = 4.8 ± 0.5. The relation is much tighter than the relation between Mbh and bulge luminosity, with a scatter no larger
L. Ferrarese, D. Merritt
semanticscholar +1 more source
European Physical Journal C: Particles and Fields, 2023 Supermassive black holes from the center of galaxy may be immersed in a dark matter halo. This dark matter halo may form a “cusp” structure around the black hole and disappear at a certain distance from the black hole.
Dong Liu +4 more
doaj +1 more source
First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole [PDF]
, 2019 When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon.
The Event Horizon Telescope Collaboration
semanticscholar +1 more source