Results 91 to 100 of about 32,039 (196)

Phenomenological Analogies in Black Hole Systems of all Masses

, 2004
I review the progress made on the physics of relativistic jets from black hole systems in the context of the analogy between AGN and microquasars that was proposed one decade ago.
Mirabel, I. F.
core   +2 more sources

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

Two Radio Cores in GPS J1543-0757: A New Dual Supermassive Black Hole System?

The Astrophysical Journal
We report on the discovery of a dual supermassive black hole system in the radio galaxy J1543−0757, with a projected separation between the two black holes of ∼46 mas. The result is based on recent multifrequency observations using the Very Long Baseline
Xiaopeng Cheng, Bong Won Sohn
doaj   +1 more source

Black Holes and Baryon Number Violation: Unveiling the Origins of Early Galaxies and the Low-Mass Gap

Galaxies
We propose that modifications to the Higgs potential within a narrow atmospheric layer near the event horizon of an astrophysical black hole could significantly enhance the rate of sphaleron transitions, as well as transform the Chern–Simons number into ...
Merab Gogberashvili, Alexander S. Sakharov   +1 more
doaj   +1 more source

Formation of Merging Stellar-mass Black Hole Binaries by Gravitational-wave Emission in Active Galactic Nucleus Disks

The Astrophysical Journal
Many stellar-mass black holes (sBHs) are expected to orbit supermassive black holes at galactic centers. For galaxies with active galactic nuclei, it is likely that the sBHs reside in a disk.
Barak Rom, Re’em Sari, Dong Lai
doaj   +1 more source

Inner region accretion flows onto black holes [PDF]

, 1999
We examine here the inner region accretion flows onto black holes. A variety of models are presented. We also discuss viscosity mechanisms under a variety of circumstances, for standard accretion disks onto galactic black holes and supermassive black ...
Kafatos, Menas, Subramanian, Prasad
core   +1 more source

Gravitational Wave Bursts from Collisions of Primordial Black Holes in Clusters

, 2010
The rate of gravitational wave bursts from the mergers of massive primordial black holes in clusters is calculated. Such clusters of black holes can be formed through phase transitions in the early Universe.
A. Cattaneo, A. Sesana, C. M. Will, H. Mouri, L. P. Grishchuk, L. Spitzer, M. Mapelli, M. Yu. Khlopov, M. Yu. Khlopov, S. G. Rubin, S. G. Rubin, S. G. Rubin, V. Dokuchaev, V. I. Dokuchaev, Y. Gao, Yu. N. Eroshenko   +15 more
core   +1 more source

Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos. [PDF]

Nat Commun, 2021
Kimura SS, Murase K, Mészáros P.
europepmc   +1 more source

Supermassive black holes in spiral galaxies [PDF]

Proceedings of the International Astronomical Union, 2004
6 pages, 5 figures, to be published in "The Interplay among Black Holes, Stars and ISM in Galactic Nuclei," Th. Storchi Bergmann, L.C. Ho & H.R.
openaire   +2 more sources