Results 131 to 140 of about 132,127 (279)

Supermassive Black Holes and Galaxy Formation [PDF]

, 2002
Abstract Predicted by the theory of general relativity, black holes are among the strangest objects known to exist. A point in space usually has a past and a future. An explosion is an example of a point in space–time. The explosion is both at a specific point in space and at a specific time.
openaire   +3 more sources

Enhancing the rate of tidal disruptions of stars by a self-gravitating disc around a massive central black hole

EPJ Web of Conferences, 2012
We further study the idea that a self-gravitating accretion disc around a supermassive black hole can increase the rate of gradual orbital decay of stellar trajectories (and hence tidal disruption events) by setting some stars on eccentric trajectories ...
Šubr L., Karas V.
doaj   +1 more source

Strong deflection gravitational lensing by a modified Hayward black hole

European Physical Journal C: Particles and Fields, 2017
A modified Hayward black hole is a nonsingular black hole. It is proposed that it would form when the pressure generated by quantum gravity can stop matter’s collapse as the matter reaches the Planck density.
Shan-Shan Zhao, Yi Xie
doaj   +1 more source

A systematic search for close supermassive black hole binaries in the Catalina Real-time Transient Survey [PDF]

, 2015
Hierarchical assembly models predict a population of supermassive black hole (SMBH) binaries. These are not resolvable by direct imaging but may be detectable via periodic variability (or nanohertz frequency gravitational waves).
M. Graham, S. Djorgovski, D. Stern, A. Drake, A. Mahabal, C. Donalek, E. Glikman, Steve Larsen, E. Christensen   +8 more
semanticscholar   +1 more source

High-energy signatures of binary supermassive black holes

EPJ Web of Conferences, 2013
Some active galactic nuclei are supposed to harbor binary systems of supermassive black holes. They are an attractive target for gravitational wave experiments.
Vila Gabriela S., Pérez Daniela, Romero Gustavo E.   +2 more
doaj   +1 more source

Formation of Merging Stellar-mass Black Hole Binaries by Gravitational-wave Emission in Active Galactic Nucleus Disks

The Astrophysical Journal
Many stellar-mass black holes (sBHs) are expected to orbit supermassive black holes at galactic centers. For galaxies with active galactic nuclei, it is likely that the sBHs reside in a disk.
Barak Rom, Re’em Sari, Dong Lai
doaj   +1 more source

Dark matter annihilation via Breit-Wigner enhancement with heavier mediator

Physics Letters B
We propose a new scenario that both the dark matter freeze-out in the early Universe and its possible annihilation for indirect detection around a supermassive black hole are enhanced by a Breit-Wigner resonance.
Yu Cheng, Shao-Feng Ge, Jie Sheng, Tsutomu T. Yanagida   +3 more
doaj   +1 more source

Null Geodesics and Strong Field Gravitational Lensing of Black Hole with Global Monopole

Advances in High Energy Physics, 2015
We study two interesting features of a black hole with an ordinary as well as phantom global monopole. Firstly, we investigate null geodesics which imply unstable orbital motion of particles for both cases.
M. Sharif, Sehrish Iftikhar
doaj   +1 more source

Supermassive Black Holes

, 2007
26 pages, 15 figures, to appear in "Kerr Spacetime: Rotating Black Holes in General Relativity" eds. D.L. Wiltshire, M. Visser and S.M. Scott, (Cambridge Univ. Press)
openaire   +2 more sources

MEASURING SUPERMASSIVE BLACK HOLE SPINS IN AGN

Acta Polytechnica, 2013
Measuring the spins of supermassive black holes (SMBHs) in active galactic nuclei (AGN) can inform us about the relative role of gas accretion vs. mergers in recent epochs of the life of the host galaxy and its AGN.
Laura Brenneman
doaj   +1 more source