Results 81 to 90 of about 159,631 (288)

Wandering Supermassive Black Holes in Milky-Way-mass Halos [PDF]

, 2018
We present a self-consistent prediction from a large-scale cosmological simulation for the population of “wandering” supermassive black holes (SMBHs) of mass greater than 106 M ⊙ on long-lived, kpc-scale orbits within Milky Way (MW)-mass galaxies.
M. Tremmel, F. Governato, M. Volonteri, A. Pontzen, T. Quinn   +4 more
semanticscholar   +1 more source

Early formation of supermassive black holes via dark matter self-interactions [PDF]

Journal of Cosmology and Astroparticle Physics, 2018
The existence of supermassive black holes at high redshifts (z∼7) is difficult to accommodate in standard astrophysical scenarios. It has been shown that dark matter models with a subdominant self-interacting component are able to produce early seeds for
J. Choquette, J. Cline, Jonathan M. Cornell   +2 more
semanticscholar   +1 more source

Gravitational lensing by a Horndeski black hole

European Physical Journal C: Particles and Fields, 2017
In this article we study gravitational lensing by non-rotating and asymptotically flat black holes in Horndeski theory. By adopting the strong deflection limit, we calculate the deflection angle, from which we obtain the positions and the magnifications ...
Javier Badía, Ernesto F. Eiroa
doaj   +1 more source

Leptonic and Hadronic Radiative Processes in Supermassive-Black-Hole Jets

Galaxies, 2020
Supermassive black holes lying in the center of galaxies can launch relativistic jets of plasma along their polar axis. The physics of black-hole jets is a very active research topic in astrophysics, owing to the fact that many questions remain open on ...
Matteo Cerruti
doaj   +1 more source

First Detection of an Overmassive Black Hole Galaxy UHZ1: Evidence for Heavy Black Hole Seed Formation from Direct Collapse

The Astrophysical Journal Letters, 2023
The recent Chandra-JWST discovery of a quasar in the z ≈ 10.1 galaxy UHZ1 reveals that accreting supermassive black holes were already in place 470 million years after the Big Bang. The Chandra X-ray source detected in UHZ1 is a Compton-thick quasar with
Priyamvada Natarajan, Fabio Pacucci, Angelo Ricarte, Ákos Bogdán, Andy D. Goulding, Nico Cappelluti   +5 more
doaj   +1 more source

Black Holes, Mergers, and the Entropy Budget of the Universe

, 2002
Vast amounts of entropy are produced in black hole formation, and the amount of entropy stored in supermassive black holes at the centers of galaxies is now much greater than the entropy free in the rest of the universe.
Abrahams A M (Binary Black Hole Grand Challenge Alliance Collaboration), Anninos P, Anninos P, Barr S M, Baumgarte T W, Flanagan E E, Holman R, Janka H T, Kamionkowski M, Macchetto E D, Postnov K A, Rees M J, Saijo M, Shibata M, Silk J, Starkman G D, Thomas W Kephart, Tinto M, Totani T, Valageas P, Wilson J R, Y Jack Ng, Yungelson L   +22 more
core   +2 more sources

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

A DISPLACED SUPERMASSIVE BLACK HOLE IN M87 [PDF]

The Astrophysical Journal, 2010
ApJ Letters ...
David J. Axon, David J. Axon, Eric S. Perlman, Andrew Robinson, Dan Batcheldor, David Merritt   +5 more
openaire   +3 more sources

Ram-pressure feeding of supermassive black holes [PDF]

Nature, 2017
When a supermassive black hole at the centre of a galaxy accretes matter, it gives rise to a highly energetic phenomenon: an active galactic nucleus. Numerous physical processes have been proposed to account for the funnelling of gas towards the galactic
B. Poggianti, Y. Jaffé, A. Moretti, M. Gullieuszik, M. Radovich, S. Tonnesen, J. Fritz, D. Bettoni, B. Vulcani, G. Fasano, C. Bellhouse, G. Hau, A. Omizzolo   +12 more
semanticscholar   +1 more source

Measuring spin of a supermassive black hole at the Galactic centre -- Implications for a unique spin

, 2010
We determine the spin of a supermassive black hole in the context of discseismology by comparing newly detected quasi-periodic oscillations (QPOs) of radio emission in the Galactic centre, Sagittarius A* (Sgr A*), as well as infrared and X-ray emissions ...
Abramowicz, Baganoff, Bardeen, Bardeen, Beskin, Blandford, Bélanger, Gammie, Genzel, Ghez, Gierliński, Gillessen, H. Negoro, Hamaus, Hawley, Hirose, Homan, Kato, Kato, Kato, Kato, Kato, King, M. Miyoshi, Machida, Markowitz, McKinney, Moderski, Novikov, Nowak, Okazaki, Orosz, Page, R. Matsumoto, R. Takahashi, Remillard, Schödel, Shakura, Shapiro, Takahashi, Volonteri, Wilson, Y. Kato, Yuan, Yusef-Zadeh   +44 more
core   +1 more source