Results 131 to 140 of about 166,156 (289)

Updated Mass Scaling Relations for Nuclear Star Clusters and a Comparison to Supermassive Black Holes

, 2013
We investigate whether nuclear star clusters and supermassive black holes follow a common set of mass scaling relations with their host galaxy's properties, and hence can be considered to form a single class of central massive object.
Alister W. Graham, Balcells, Balcells, Bekki, Bell, Bell, Côté, de Vaucouleurs, Ebisuzaki, Ferrarese, Ferrarese, Ferrarese, Gebhardt, González Delgado, Graham, Graham, Graham, Graham, Graham, Graham, Häring, Jarrett, Jorgensen, Kormendy, Magorrian, Marconi, McLaughlin, Mei, Merritt, Merritt, Mieske, Nicholas Scott, Novak, O'Leary, Schlegel, Seth, Silk, Tremaine, Turner, Wehner   +39 more
core   +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

Supermassive Black Holes as the Regulators of Star Formation in Central Galaxies [PDF]

, 2017
We present the relationship between the black hole mass, stellar mass, and star formation rate (SFR) of a diverse group of 91 galaxies with dynamically measured black hole masses.
Bryan A. Terrazas, E. Bell, J. Woo, B. Henriques   +3 more
semanticscholar   +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

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

Evolution of supermassive stars as a pathway to black hole formation

, 2009
Supermassive stars, with masses greater than a million solar masses, are possible progenitors of supermassive black holes in galactic nuclei. Because of their short nuclear burning timescales, such objects can be formed only when matter is able to ...
Begelman, Begelman, Begelman, Begelman, Begelman, Bisnovatyi-Kogan, Blandford, Blandford, Bondi, Bromm, Burbidge, Clayton, Fowler, Fowler, Fuller, Hoyle, Hoyle, Iben, Levine, Mathews, Mitchell C. Begelman, Narayan, Narayan, Ozernoy, Quataert, Regan, Trenti, Trenti, Wise, Woosley   +29 more
core   +1 more source

Supermassive black holes formed by direct collapse of inflationary perturbations [PDF]

, 2016
We propose a mechanism of producing a new type of primordial perturbations that collapse to primordial black holes whose mass can be as large as necessary for them to grow to the supermassive black holes observed at high redshifts, without contradicting ...
T. Nakama, T. Suyama, J. Yokoyama
semanticscholar   +1 more source

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

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