Results 131 to 140 of about 7,819 (229)

Primordial black holes in cosmological simulations: growth prospects for supermassive black holes

The Open Journal of Astrophysics
It 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, John A Regan, Daxal Mehta, Peter Coles, Pratika Dayal   +4 more
doaj   +1 more source

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

Super-Eddington Accretion in Quasars

Universe
This review provides an observational perspective on the fundamental properties of super-Eddington accretion onto supermassive black holes in quasars.
Paola Marziani, Karla Garnica Luna, Alberto Floris, Ascensión del Olmo, Alice Deconto-Machado, Tania M. Buendia-Rios, C. Alenka Negrete, Deborah Dultzin   +7 more
doaj   +1 more source

Supermassive Black Holes and Their Host Galaxies

Publications of the Astronomical Society of the Pacific, 2008
n ...
openaire   +1 more source

Presentation: Supermassive Black Holes: Galaxy Monsters, Presentation [PDF]

, 2002
Introduction: Black holes with masses of a million to a few billion times the mass of the Sun are believed to be the engines that power nuclear activity in galaxies.
Kormendy, John, Environmental Science Institute   +1 more
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Dynamics around supermassive black holes [PDF]

, 2020
The dynamics of galactic nuclei reflects the presence of supermassive black holes (SBHs) in many ways. Single SBHs act as sinks, destroying a mass in stars equal to their own mass in roughly one relaxation time and forcing nuclei to expand.
Gualandris, A, Merritt, D
core  

Connecting Cores and Black Hole Dynamics across Scales: From Globular Clusters to Massive Ellipticals

The Astrophysical Journal Letters
The centers of massive elliptical galaxies exhibit a wide range in density profiles, from central cusps to resolved cores with order kiloparsec sizes.
Kyle Kremer, Newlin C. Weatherford, Philip F. Hopkins, Nicholas Z. Rui, Claire S. Ye   +4 more
doaj   +1 more source

Accretion onto Supermassive Black Holes: Fuel for Quasars [PDF]

, 2011
Quasars are the most luminous objects in the Universe. Strict size and mass constraints for the central emitting region in these objects present astronomers with the problem of identifying their source of energy.
French, David Matthew
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New Estimates of the Spin and Accretion Rate of the Black Hole M87*

The Astrophysical Journal Letters
In this Letter, we use the imaging results of M87* from the Event Horizon Telescope (EHT) to calculate the rotational velocity of the inner edge of the accretion disk and find a value of ∼0.14 c .
Michael Drew, Joshua S. Stanway, Brett A. Patterson, Timothy J. Walton, Derek Ward-Thompson   +4 more
doaj   +1 more source

Supermassive black holes as sources for LISA [PDF]

, 2007
. I briefly discuss some issues relevant for the formation of supermassive black holes and give estimates of the event rates for the emission of gravitational waves by coalescing supermassive black hole binaries.
Martin Haehnelt
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