Results 91 to 100 of about 5,650 (230)

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

Supermassive black holes from primordial black hole seeds [PDF]

open access: yesPhysical Review D, 2004
The observational evidence for a population of quasars powered by supermassive black holes of mass \geq 10^9 M_sun at redshifts z\geq 6 poses a great challenge for any model describing the formation of galaxies. Assuming uninterrupted accretion at the Eddington limit, seed black holes of at least 1000 M_sun are needed at z \approx 15.
openaire   +2 more sources

Observational Evidence for a Correlation between the Magnetic Field of Jets and Star Formation Rate in Host Galaxies

open access: yesThe Astrophysical Journal
Accretion supermassive black holes in the center of active galaxies usually produce “jet”-collimated bipolar outflows of relativistic particles. Magnetic fields near the black hole event horizon may play a crucial role in the formation of jets/outflows ...
Yongyun Chen   +6 more
doaj   +1 more source

Detection of Periodic Radio Signal from the Blazar J1043+2408

open access: yesGalaxies, 2018
The search for periodic signals from blazars has become a widely discussed topic in recent years. In the scenario that such periodic changes originate from the innermost regions of blazars, the signals bear imprints of the processes occurring near the ...
Gopal Bhatta
doaj   +1 more source

Supermassive black holes with stellar companions

open access: yesAIP Conference Proceedings, 1994
Low‐mass stars in close orbits around supermassive black holes in active galactic nuclei (AGN) may provide an important signature for testing the existence of supermassive black holes. Here we discuss how such systems can form by being ‘‘ground down’’ by their interaction with an AGN accretion disk and discuss the peculiarities of such binaries with ...
Podsiadlowski, P, Rees, M
openaire   +2 more sources

The Use of Binary Black Holes Merging in Active Galactic Nuclei Disks for Hubble Constant Measurements

open access: yesThe Astrophysical Journal
We study the impact of environmental effects on the measurement of the Hubble constant ( H _0 ) from gravitational-wave (GW) observations of binary black hole mergers residing in active galactic nuclei (AGNs) near the central supermassive black hole ...
Guo-Peng Li, Xi-Long Fan
doaj   +1 more source

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