A Stringent Limit on the Accretion Luminosity of the Possible Central Black Hole in the Globular Cluster M15

2003 ◽  
Vol 587 (1) ◽  
pp. L35-L38 ◽  
Author(s):  
Luis C. Ho ◽  
Yuichi Terashima ◽  
Takashi Okajima
Keyword(s):  
Black Hole ◽  
Globular Cluster ◽  
Central Black Hole ◽  
Stringent Limit

scholarly journals A Search for Post-Collapse Cores

1985 ◽  
Vol 113 ◽  
pp. 73-76
Author(s):  
S. Djorgovski ◽  
H. Penner
Keyword(s):  
Black Hole ◽  
Globular Cluster ◽  
Surface Photometry ◽  
Central Black Hole ◽  
Preliminary Results ◽  
The Galaxy ◽  
Cluster Cores

We report the preliminary results of a surface photometry survey of globular cluster cores. Two new cores with post-collapse morphology have been found, and two possible candidates. The estimated fraction of clusters with this core morphology in the Galaxy is only a few percent. Most clusters do not show a morphology similar to the predictions of the central black hole models.

scholarly journals 11.13. Gravitational waves generated by globular cluster systems collapse

1998 ◽  
Vol 184 ◽  
pp. 481-482
Author(s):  
R. Capuzzo-Dolcetta ◽  
P. Miocchi
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Gravitational Waves ◽  
Globular Cluster ◽  
Globular Clusters ◽  
Galactic Nuclei ◽  
Elliptical Galaxies ◽  
Central Black Hole ◽  
Time Rate ◽  
Cluster Systems

The hypothesis -raised and discussed in - that the source of AGN fueling can be, at least in elliptical galaxies, stars belonging to a dense stellar environment formed by globular clusters frictionally decayed and tidally destroyed by the gravitational field of central black hole (b.h.), is strongly supported in. The quantity of star mass swallowed by the b.h. and its time rate seem at all compatible with those needed to justify the intensity and time characteristics of galactic nuclei activity (see also).

The Double Nucleus and Central Black Hole of M31

1999 ◽  
Vol 522 (2) ◽  
pp. 772-792 ◽  
Author(s):  
John Kormendy ◽  
Ralf Bender
Keyword(s):  
Black Hole ◽  
Central Black Hole ◽  
Double Nucleus

scholarly journals Wandering of the central black hole in a galactic nucleus and correlation of the black hole mass with the bulge mass

2021 ◽  
Author(s):  
Hajime Inoue
Keyword(s):  
Black Hole ◽  
Loss Rate ◽  
Energy Gain ◽  
Stellar Disk ◽  
Black Hole Mass ◽  
Central Black Hole ◽  
Massive Black Hole ◽  
Stellar Cluster ◽  
Upper Limit ◽  
Simple Parameter

Abstract We investigate a mechanism for a super-massive black hole at the center of a galaxy to wander in the nucleus region. A situation is supposed in which the central black hole tends to move by the gravitational attractions from the nearby molecular clouds in a nuclear bulge but is braked via the dynamical frictions from the ambient stars there. We estimate the approximate kinetic energy of the black hole in an equilibrium between the energy gain rate through the gravitational attractions and the energy loss rate through the dynamical frictions in a nuclear bulge composed of a nuclear stellar disk and a nuclear stellar cluster as observed from our Galaxy. The wandering distance of the black hole in the gravitational potential of the nuclear bulge is evaluated to get as large as several 10 pc, when the black hole mass is relatively small. The distance, however, shrinks as the black hole mass increases, and the equilibrium solution between the energy gain and loss disappears when the black hole mass exceeds an upper limit. As a result, we can expect the following scenario for the evolution of the black hole mass: When the black hole mass is smaller than the upper limit, mass accretion of the interstellar matter in the circumnuclear region, causing the AGN activities, makes the black hole mass larger. However, when the mass gets to the upper limit, the black hole loses the balancing force against the dynamical friction and starts spiraling downward to the gravity center. From simple parameter scaling, the upper mass limit of the black hole is found to be proportional to the bulge mass, and this could explain the observed correlation of the black hole mass with the bulge mass.

scholarly journals The Merger Rate of Black Holes in a Primordial Black Hole Cluster

Physics ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 372-378
Author(s):  
Viktor D. Stasenko ◽  
Alexander A. Kirillov
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Mass Spectrum ◽  
Star Clusters ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Central Black Hole ◽  
Solar Mass ◽  
Merger Rate

In this paper, the merger rate of black holes in a cluster of primordial black holes (PBHs) is investigated. The clusters have characteristics close to those of typical globular star clusters. A cluster that has a wide mass spectrum ranging from 10−2 to 10M⊙ (Solar mass) and contains a massive central black hole of the mass M•=103M⊙ is considered. It is shown that in the process of the evolution of cluster, the merger rate changed significantly, and by now, the PBH clusters have passed the stage of active merging of the black holes inside them.

Central Black Hole Masses in Active Galactic Nuclei Inferred from X‐Ray Variability

1998 ◽  
Vol 500 (2) ◽  
pp. 642-659 ◽  
Author(s):  
Kiyoshi Hayashida ◽  
Sigenori Miyamoto ◽  
Shunji Kitamoto ◽  
Hitoshi Negoro ◽  
Hajime Inoue
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Central Black Hole ◽  
X Ray ◽  
Black Hole Masses
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