Results 91 to 100 of about 1,397 (183)
The Astrophysical Journal LettersSupermassive black hole (SMBH) growth plausibly occurs via runaway astrophysical black hole mergers in nuclear star clusters that form intermediate mass black hole seeds at high redshifts.
Konstantinos Kritos, Joseph Silk
doaj +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
openaire +2 more sources
The Astrophysical JournalWe study the impact of environmental effects on the measurement of the Hubble constant ( H _0 ) from gravitational-wave (GW) observations of binary black hole mergers residing in active galactic nuclei (AGNs) near the central supermassive black hole ...
Guo-Peng Li, Xi-Long Fan
doaj +1 more source
The Role of Inhomogeneities in the Turbulent Accretion of Black Holes
The Astrophysical JournalObservations of supermassive black holes by the Event Horizon Telescope reveal significant inhomogeneities, most likely related to density and magnetic field perturbations.
Giuseppe Ficarra +3 more
doaj +1 more source
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
A Stellar Dynamical Mass Measurement of the Supermassive Black Hole in NGC 3258
The Astrophysical JournalWe present a stellar dynamical mass measurement of the supermassive black hole in the elliptical (E1) galaxy NGC 3258. Our findings are based on integral field unit spectroscopy from the Multi Unit Spectroscopic Explorer (MUSE) observations in narrow ...
Thomas K. Waters +4 more
doaj +1 more source
The Astrophysical Journal LettersThe centers of massive elliptical galaxies exhibit a wide range in density profiles, from central cusps to resolved cores with order kiloparsec sizes.
Kyle Kremer +4 more
doaj +1 more source
X-ray flares from the stellar tidal disruption by a candidate supermassive black hole binary. [PDF]
Nat Commun, 2020 Shu X +10 more
europepmc +1 more source
Follow the Mass—A Concordance Picture of Tidal Disruption Events
The Astrophysical JournalThree recent global simulations of tidal disruption events (TDEs) have produced, using different numerical techniques and parameters, very similar pictures of their dynamics.
Julian Krolik, Tsvi Piran, Taeho Ryu
doaj +1 more source
European Physical Journal C: Particles and FieldsIn this work we focus on the effects of Starobinsky–Bel–Robinson (SBR) gravity parameter and external magnetic field on the motion of charged test particles and magnetic dipoles moving around a black hole in the selected gravity theory.
Akbar Davlataliev +4 more
doaj +1 more source