Results 111 to 120 of about 110,858 (238)

THE SUPERMASSIVE BLACK HOLE IN M84 REVISITED [PDF]

open access: yesThe Astrophysical Journal, 2010
The mass of the central black hole in the giant elliptical galaxy M84 has previously been measured by two groups using the same observations of emission-line gas with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, giving strongly discrepant results: Bower et al. (1998) found M_BH = (1.5^{+1.1}_{-0.6}) x 10^9 M_sun, while
Jonelle L. Walsh   +2 more
openaire   +3 more sources

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

open access: yesThe 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

To test dual supermassive black hole model for broad line AGN with double-peaked narrow [OIII] lines [PDF]

open access: yesarXiv, 2016
In this manuscript, we proposed an interesting method to test the dual supermassive black hole model for AGN with double-peaked narrow \oiii lines (double-peaked narrow emitters), through their broad optical Balmer line properties. Under the dual supermassive black hole model for double-peaked narrow emitters, we could expect statistically smaller ...
arxiv  

Supermassive Black Holes and Galaxy Formation [PDF]

open access: yes, 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

Bayesian Black Hole Photogrammetry

open access: yesThe Astrophysical Journal
We propose an analytic dual-cone accretion model for horizon-scale images of the cores of low-luminosity active galactic nuclei, including those observed by the Event Horizon Telescope (EHT).
Dominic O. Chang   +3 more
doaj   +1 more source

Black Holes and Baryon Number Violation: Unveiling the Origins of Early Galaxies and the Low-Mass Gap

open access: yesGalaxies
We propose that modifications to the Higgs potential within a narrow atmospheric layer near the event horizon of an astrophysical black hole could significantly enhance the rate of sphaleron transitions, as well as transform the Chern–Simons number into ...
Merab Gogberashvili   +1 more
doaj   +1 more source

Tidal disruption flares from stars on eccentric orbits

open access: yesEPJ Web of Conferences, 2012
We study tidal disruption and subsequent mass fallback for stars approaching supermassive black holes on bound orbits, by performing three dimensional Smoothed Particle Hydrodynamics simulations with a pseudo-Newtonian potential.
Loeb A., Stone N., Hayasaki K.
doaj   +1 more source

Low-Mass AGN and Their Relation to the Fundamental Plane of Black Hole Accretion [PDF]

open access: yes, 2014
We put active galactic nuclei (AGNs) with low-mass black holes on the fundamental plane of black hole accretion---the plane that relates X-ray emission, radio emission, and mass of an accreting black hole---to test whether or not the relation is universal for both stellar-mass and supermassive black holes.
arxiv   +1 more source

Two Radio Cores in GPS J1543-0757: A New Dual Supermassive Black Hole System?

open access: yesThe Astrophysical Journal
We report on the discovery of a dual supermassive black hole system in the radio galaxy J1543−0757, with a projected separation between the two black holes of ∼46 mas. The result is based on recent multifrequency observations using the Very Long Baseline
Xiaopeng Cheng, Bong Won Sohn
doaj   +1 more source

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

open access: yes, 2009
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 with those of the Galactic black holes.
arxiv   +1 more source

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