Results 111 to 120 of about 264,425 (308)

A Supermassive Black Hole in an Ultracompact Dwarf Galaxy

, 2014
Ultracompact dwarf galaxies (UCDs) are among the densest stellar systems in the universe. These systems have masses up to 200 million solar masses, but half light radii of just 3-50 parsecs.
Baumgardt, Holger, Bosch, Remco van den, Brodie, Jean, Brok, Mark den, Chilingarian, Igor, Frank, Matthias, Hilker, Michael, McDermid, Richard, Mieske, Steffen, Neumayer, Nadine, Seth, Anil, Spitler, Lee, Strader, Jay, Walsh, Jonelle L.   +13 more
core   +1 more source

Constraining the Orbit of the Supermassive Black Hole Binary 0402+379 [PDF]

, 2017
The radio galaxy 0402+379 is believed to host a supermassive black hole binary (SMBHB). The two compact-core sources are separated by a projected distance of 7.3 pc, making it the most (spatially) compact resolved SMBHB known.
K. Bansal, G. Taylor, A. Peck, R. Zavala, R. Romani   +4 more
semanticscholar   +1 more source

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
wiley   +1 more source

On the orbital evolution of supermassive black hole binaries with circumbinary accretion discs [PDF]

, 2017
Gaseous circumbinary accretion discs provide a promising mechanism to facilitate the mergers of supermassive black holes (SMBHs) in galactic nuclei. We measure the torques exerted on accreting SMBH binaries, using 2D, isothermal, moving-mesh, viscous ...
Yi-Lei Tang, A. MacFadyen, Z. Haiman
semanticscholar   +1 more source

Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity

Fortschritte der Physik, Volume 72, Issue 4, April 2024.
Abstract Symmergent gravity is an emergent gravity model with an R+R2$R+R^2$ curvature sector and an extended particle sector having new particles beyond the known ones. With constant scalar curvature, asymptotically flat black hole solutions are known to have no sensitivity to the quadratic curvature term (coefficient of R2$R^2$). With variable scalar
Beyhan Puliçe, Reggie C. Pantig, Ali Övgün, Durmuş Demir   +3 more
wiley   +1 more source

Nuclear Spirals and Supermassive Black Holes [PDF]

Symposium - International Astronomical Union, 2004
We have performed SPH simulations for the response of the gaseous disks to the imposed potentials including those from bars and SMBHs. Evolution of the nuclear regions of gaseous disks depends critically on the masses of SMBHs as well as the sound speed in the gas.
Hong Bae Ann, Parijat Thakur
openaire   +3 more sources

Gravitational Larmor precession

European Physical Journal C: Particles and Fields, 2023
Inspired by the reported existence of substantive magnetic fields in the vicinity of the central supermassive black holes in Sagittarius A* and Messier 87*, we consider test particle motion in the spacetime close to a generic spherical black hole in the ...
Chandrachur Chakraborty, Parthasarathi Majumdar   +1 more
doaj   +1 more source

Hierarchical build-up of galactic bulges and the merging rate of supermassive binary black holes

, 2003
The hierarchical build-up of galactic bulges should lead to the build-up of present-day supermassive black holes by a mixture of gas accretion and merging of supermassive black holes.
Begelman M, Begelman M, Bender P, Bernardi M, Gerssen J, Haehnelt M G, Haehnelt M G, Haehnelt M G, Martin G Haehnelt, Milosavljevic M, Soltan A, Yu Q   +11 more
core   +1 more source

Investigating the Relativistic Motion of the Stars Near the Supermassive Black Hole in the Galactic Center [PDF]

, 2017
The S-star cluster in the Galactic center allows us to study the physics close to a supermassive black hole, including distinctive dynamical tests of general relativity.
M. Parsa, M. Parsa, A. Eckart, A. Eckart, B. Shahzamanian, V. Karas, M. Zajaček, M. Zajaček, J. Zensus, C. Straubmeier   +9 more
semanticscholar   +1 more source

The MEGaN project II. Gravitational waves from intermediate-mass and binary black holes around a supermassive black hole [PDF]

Monthly notices of the Royal Astronomical Society, 2017
We investigate the evolution of intermediate-mass (IMBHs), stellar (BHs) and binary black holes (BHBs), deposited near a supermassive black hole (SMBH) by a population of massive star clusters.
M. Arca-Sedda, R. Capuzzo-Dolcetta
semanticscholar   +1 more source