Results 31 to 40 of about 8,827 (222)

A Global Inventory of Feedback

open access: yesGalaxies, 2023
Feedback from both supermassive black holes and massive stars plays a fundamental role in the evolution of galaxies and the inter-galactic medium. In this paper, we use available data to estimate the total amount of kinetic energy and momentum created ...
Timothy M. Heckman, Philip N. Best
doaj   +1 more source

A supermassive black hole awakes [PDF]

open access: yesScience, 2017
Active Galaxies Every large galaxy hosts a supermassive black hole at its center, which grows by consuming passing gas or stars. Most are quiescent, but when the black hole is feeding, an accretion disk forms, causing the galaxy nucleus to shine brightly as a quasar. Gezari et al.
openaire   +2 more sources

The NANOGrav 12.5 yr Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries

open access: yesThe Astrophysical Journal Letters, 2023
Pulsar timing array collaborations, such as the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), are seeking to detect nanohertz gravitational waves emitted by supermassive black hole binaries formed in the aftermath of galaxy ...
Zaven Arzoumanian   +78 more
doaj   +1 more source

Formation of supermassive black holes [PDF]

open access: yesThe Astronomy and Astrophysics Review, 2010
To appear in The Astronomy and Astrophysics Review.
openaire   +2 more sources

The Dynamics of White Dwarfs, Black Holes and Stellar Cusps [PDF]

open access: yes, 2013
This thesis contains topics related mostly to the dynamics of white dwarfs (chapter 2), the dynamics of stars around binary super massive black holes (chapters 4, 5 and 6) and dynamics in the singular isothermal sphere (chapter 7).
Wegg, Christopher
core   +1 more source

The spin of supermassive black holes [PDF]

open access: yesClassical and Quantum Gravity, 2013
Invited article accepted for publication in the focus issue on astrophysical black holes in Classical and Quantum Gravity, guest editors: D. Merritt and L. Rezzolla.
openaire   +2 more sources

Supermassive black holes then and now [PDF]

open access: yesAIP Conference Proceedings, 1998
7 pages, to appear in The Proceedings of the Second International LISA Symposium on Graviational Waves, ed.
openaire   +3 more sources

Gravitational lensing by a quantum deformed Schwarzschild black hole

open access: yesEuropean 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

No Supermassive Black Hole in M33?

open access: yesScience, 2001
We observed the nucleus of M33, the third-brightest galaxy in the Local Group, with the Space Telescope Imaging Spectrograph at a resolution at least a factor of 10 higher than previously obtained. Rather than the steep rise expected within the radius of gravitational influence of a supermassive black hole, the random stellar velocities showed a ...
Merritt, David   +2 more
openaire   +3 more sources

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

open access: yesEuropean 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   +4 more
doaj   +1 more source

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