Results 111 to 120 of about 32,361 (211)
Supermassive black holes from primordial black hole seeds [PDF]
Physical Review D, 2004 The observational evidence for a population of quasars powered by supermassive black holes of mass \geq 10^9 M_sun at redshifts z\geq 6 poses a great challenge for any model describing the formation of galaxies. Assuming uninterrupted accretion at the Eddington limit, seed black holes of at least 1000 M_sun are needed at z \approx 15.
openaire +2 more sources
, 2012 We consider test planet and photon orbits of the third kind inside a black hole, which are stable, periodic and neither come out of the black hole nor terminate at the singularity.
B. Carter +6 more
core +1 more source
87th Annual Meeting of the Meteoritical Society 2025: Abstracts
Meteoritics &Planetary Science, Volume 60, Issue S1, Page 30-350, August 2025.
wiley +1 more source
Supermassive black holes with stellar companions
AIP Conference Proceedings, 1994 Low‐mass stars in close orbits around supermassive black holes in active galactic nuclei (AGN) may provide an important signature for testing the existence of supermassive black holes. Here we discuss how such systems can form by being ‘‘ground down’’ by their interaction with an AGN accretion disk and discuss the peculiarities of such binaries with ...
Podsiadlowski, P, Rees, M
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Dynamics Around Supermassive Black Holes: Extreme-mass-ratio Inspirals as Gravitational-wave Sources
The Astrophysical JournalSupermassive black holes and their surrounding dense stellar environments nourish a variety of astrophysical phenomena. We focus on the distribution of stellar-mass black holes around the supermassive black hole and the consequent formation of extreme ...
Barak Rom +3 more
doaj +1 more source
High-energy signatures of binary supermassive black holes
EPJ Web of Conferences, 2013 Some active galactic nuclei are supposed to harbor binary systems of supermassive black holes. They are an attractive target for gravitational wave experiments.
Vila Gabriela S. +2 more
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Primordial black holes in cosmological simulations: growth prospects for supermassive black holes
The Open Journal of AstrophysicsIt has long been suggested that a fraction of the dark matter in the Universe could exist in the form of primordial black holes (PBHs) that have existed since the radiation dominated era.
Lewis R Prole +4 more
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Super-Eddington Accretion in Quasars
UniverseThis review provides an observational perspective on the fundamental properties of super-Eddington accretion onto supermassive black holes in quasars.
Paola Marziani +7 more
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The Astrophysical Journal LettersQuasiperiodic 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
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Supermassive primordial black holes from inflation
Journal of Cosmology and Astroparticle PhysicsAbstract 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 +2 more sources