Results 71 to 80 of about 264,425 (308)

A FUNDAMENTAL EQUATION FOR SUPERMASSIVE BLACK HOLES [PDF]

International Journal of Modern Physics D, 2011
We developed a theoretical model that is able to give a common origin to the correlations between the mass M• of supermassive black holes and the mass, velocity dispersion, kinetic energy and momentum parameter of the corresponding host galaxies. Our model is essentially based on the transformation of the angular momentum of the interstellar material,
Feoli A., Mancini L.
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Supermassive Black Holes [PDF]

Journal of High Energy Physics, Gravitation and Cosmology, 2019
In the following black hole model, electrons and positrons form a neutral gas which is confined by gravitation. The smaller masses are supported against gravity by electron degeneracy pressure. Larger masses are supported by ideal gas and radiation pressure. In each case, the gas is a polytrope which satisfies the Lane-Emden equation.
openaire   +3 more sources

Gravitational ringing and superradiant instabilities of the Kerr-like black holes in a dark matter halo

European Physical Journal C: Particles and Fields, 2023
Supermassive black holes from the center of galaxy may be immersed in a dark matter halo. This dark matter halo may form a “cusp” structure around the black hole and disappear at a certain distance from the black hole.
Dong Liu, Yi Yang, Ali Övgün, Zheng-Wen Long, Zhaoyi Xu   +4 more
doaj   +1 more source

High-energy signatures of binary systems of supermassive black holes [PDF]

, 2016
Context. Binary systems of supermassive black holes are expected to be strong sources of long gravitational waves prior to merging. These systems are good candidates to be observed with forthcoming space-borne detectors.
Pérez, Daniela, Romero, Gustavo E., Vila, Gabriela S.   +2 more
core   +3 more sources

The cosmogony of supermassive black holes [PDF]

Monthly Notices of the Royal Astronomical Society, 2011
We report calculations of the evolution, under Reynolds viscosity, of the massive gaseous accretion discs thought to form in the centres of galaxies as a result of major galactic mergers at early epochs. Starting with the formation of such a disc and the postulated existence of a low-mass 'seed' black hole, we focus on the mass accretion rate, , and ...
Wolfgang J. Duschl, Wolfgang J. Duschl, Peter A. Strittmatter   +2 more
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Gravitational lensing by a quantum deformed Schwarzschild black hole

European Physical Journal C: Particles and Fields, 2021
We investigate the weak and strong deflection gravitational lensing by a quantum deformed Schwarzschild black hole and find their observables. These lensing observables are evaluated and the detectability of the quantum deformation is assessed, after ...
Xu Lu, Yi Xie
doaj   +1 more source

Oscillating axion bubbles as alternative to supermassive black holes at galactic centers [PDF]

, 2006
Recent observations of near-infrared and X-ray flares from Sagittarius A*, which is believed to be a supermassive black hole at the Galactic center, show that the source exhibits about 20-minute periodic variability.
Anatoly A Svidzinsky, Belanger G, Falcke H Markoff S Biermann P L Krichbaum T P Melia F Agol E Bower G Schilizzi R T, Hannestad S, Landau L D, Raffelt G G, Svidzinsky A A, Svidzinsky A A Klapdor-Kleingrothaus H V Arnowitt R, Will C M, Yilmaz H   +9 more
core   +2 more sources

The Black Hole Explorer: motivation and vision [PDF]

Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave
We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry (VLBI) to space.
Michael D. Johnson, K. Akiyama, Rebecca Baturin, Bryan Bilyeu, L. Blackburn, Don Boroson, A. Cárdenas-Avendaño, A. Chael, Chi-kwan Chan, Dominic O. Chang, P. Cheimets, Cathy Chou, S. Doeleman, J. Farah, P. Galison, Ronald Gamble, C. Gammie, Z. Gelles, J. Gómez, S. Gralla, P. Grimes, L. Gurvits, Shahar Hadar, K. Haworth, K. Hada, M. Hecht, M. Honma, J. Houston, Ben Hudson, S. Issaoun, He Jia, S. Jorstad, Jens Kauffmann, Yuri Y. Kovalev, Peter Kurczynski, Robert Lafon, A. Lupsasca, R. Lehmensiek, Chung-Pei Ma, D. Marrone, A. Marscher, G. J. Melnick, Ramesh Narayan, K. Niinuma, S. Noble, Eric J. Palmer, D. Palumbo, Lenny Paritsky, E. Peretz, D. Pesce, A. Plavin, E. Quataert, H. Rana, Angelo Ricarte, F. Roelofs, K. Shtyrkova, Laura C. Sinclair, Jeffrey Small, Sridharan Tirupati Kumara, R. Srinivasan, Andrew Strominger, P. Tiede, E. Tong, Jade Wang, J. Weintroub, M. Wielgus, G. Wong, X. A. Zhang   +67 more
semanticscholar   +1 more source

Cold, clumpy accretion onto an active supermassive black hole [PDF]

Nature, 2016
The so-called accretion flow that powers the growth of supermassive black holes in galaxy centres is assumed to be dominated by a smooth, steady flow of very hot plasma, but now observations instead reveal a clumpy accretion of very cold molecular clouds
Grant R. Tremblay, Grant R. Tremblay, J. Oonk, J. Oonk, F. Combes, P. Salomé, C. O’Dea, C. O’Dea, S. Baum, S. Baum, G. Voit, M. Donahue, B. McNamara, T. A. Davis, T. A. Davis, Michael McDonald, A. Edge, T. Clarke, Roberto Galván-Madrid, Roberto Galván-Madrid, M. Bremer, L. O. V. Edwards, A. C. Fabian, S. Hamer, Yuan Li, A. Maury, H. Russell, A. Quillen, C. Urry, J. Sanders, M. Wise   +30 more
semanticscholar   +1 more source

Formation of supermassive black holes [PDF]

The Astronomy and Astrophysics Review, 2010
To appear in The Astronomy and Astrophysics Review.
openaire   +4 more sources