The Role of Gas in the Merging of Massive Black Holes in Galactic Nuclei

2006 ◽  
pp. 352-353
Author(s):  
A. Escala ◽  
P.S. Coppi ◽  
R.B. Larson ◽  
D. Mardones
Keyword(s):  
Black Holes ◽  
Galactic Nuclei ◽  
Massive Black Holes

The Role of Gas in the Merging of Massive Black Holes in Galactic Nuclei. II. Black Hole Merging in a Nuclear Gas Disk

2005 ◽  
Vol 630 (1) ◽  
pp. 152-166 ◽  
Author(s):  
Andres Escala ◽  
Richard B. Larson ◽  
Paolo S. Coppi ◽  
Diego Mardones
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Galactic Nuclei ◽  
Massive Black Holes

scholarly journals Dynamics of galactic nuclei: mass segregation and collisions

2007 ◽  
Vol 3 (S245) ◽  
pp. 211-214 ◽  
Author(s):  
Marc Freitag ◽  
James E. Dale ◽  
Ross P. Church ◽  
Melvyn B. Davies
Keyword(s):  
Black Holes ◽  
Galactic Nuclei ◽  
Stellar Mass ◽  
Galactic Centre ◽  
Massive Black Holes ◽  
Giant Stars ◽  
Mass Segregation

AbstractMassive black holes (MBHs) with a mass below ~ 107 M⊙ are likely to reside at the centre of dense stellar nuclei shaped by 2-body relaxation, close interactions with the MBH and direct collisions. In this contribution, we stress the role of mass segregation of stellar-mass black holes into the innermost tenths of a parsec and point to the importance of hydrodynamical collisions between stars. At the Galactic centre, collisions must affect giant stars and some of the S-stars.

The Role of Gas in the Merging of Massive Black Holes in Galactic Nuclei. I. Black Hole Merging in a Spherical Gas Cloud

2004 ◽  
Vol 607 (2) ◽  
pp. 765-777 ◽  
Author(s):  
Andres Escala ◽  
Richard B. Larson ◽  
Paolo S. Coppi ◽  
Diego Mardones
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Galactic Nuclei ◽  
Massive Black Holes ◽  
Gas Cloud

Spherical accretion of massive black holes: A model for galactic nuclei

1981 ◽  
Vol 1 (13) ◽  
pp. 67-70
Author(s):  
L. Maraschi ◽  
G.C. Perola ◽  
A. Treves
Keyword(s):  
Black Holes ◽  
Galactic Nuclei ◽  
Massive Black Holes

scholarly journals Study of the Galactic Center with a High Resolution Gamma Ray Telescope

1989 ◽  
Vol 136 ◽  
pp. 639-643
Author(s):  
Ervin J. Fenyves ◽  
Stephen N. Balog ◽  
David B. Cline ◽  
M. Atac
Keyword(s):  
Black Holes ◽  
Active Galactic Nuclei ◽  
Gamma Ray ◽  
Galactic Center ◽  
Galactic Nuclei ◽  
Seyfert Galaxies ◽  
Hole Formation ◽  
Massive Black Holes ◽  
General Outcome ◽  
Enormous Amount

It is generally accepted that massive black holes are the most likely source for the energy radiated from active galactic nuclei, and may explain the enormous amount of energy emitted by quasars, radio galaxies, Seyfert galaxies, and BL Lacertid objects. Although the detailed mechanisms of the black hole formation in galactic nuclei are not clear at present, it seems to be quite possible that the formation of massive black holes is a general outcome of the evolution of galactic nuclei.

scholarly journals Black hole and neutron star mergers in galactic nuclei: the role of triples

2019 ◽  
Vol 488 (2) ◽  
pp. 2825-2835 ◽  
Author(s):  
Giacomo Fragione ◽  
Nathan W C Leigh ◽  
Rosalba Perna
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Neutron Star ◽  
Massive Stars ◽  
Star Clusters ◽  
Galactic Nuclei ◽  
Compact Objects ◽  
Large Numbers ◽  
Binary Case

ABSTRACT Nuclear star clusters that surround supermassive black holes (SMBHs) in galactic nuclei are thought to contain large numbers of black holes (BHs) and neutron stars (NSs), a fraction of which form binaries and could merge by Kozai–Lidov oscillations (KL). Triple compact objects are likely to be present, given what is known about the multiplicity of massive stars, whose life ends either as an NS or a BH. In this paper, we present a new possible scenario for merging BHs and NSs in galactic nuclei. We study the evolution of a triple black hole (BH) or neutron star (NS) system orbiting an SMBH in a galactic nucleus by means of direct high-precision N-body simulations, including post-Newtonian terms. We find that the four-body dynamical interactions can increase the KL angle window for mergers compared to the binary case and make BH and NS binaries merge on shorter time-scales. We show that the merger fraction can be up to ∼5–8 times higher for triples than for binaries. Therefore, even if the triple fraction is only ∼10–$20\rm{\,per\,cent}$ of the binary fraction, they could contribute to the merger events observed by LIGO/VIRGO in comparable numbers.

Magnetic field and radius of the innermost stable circular orbit near super-massive black holes in active galactic nuclei

2015 ◽  
Vol 336 (10) ◽  
pp. 1013-1016 ◽  
Author(s):  
M. Yu. Piotrovich ◽  
Yu. N. Gnedin ◽  
N. A. Silant'ev ◽  
T. M. Natsvlishvili ◽  
S. D. Buliga
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Active Galactic Nuclei ◽  
Circular Orbit ◽  
Galactic Nuclei ◽  
Massive Black Holes ◽  
Stable Circular Orbit ◽  
Innermost Stable Circular Orbit

scholarly journals 10.9. Dynamical constraints on alternatives to massive black holes in galactic nuclei

1998 ◽  
Vol 184 ◽  
pp. 447-448
Author(s):  
Eyal Maoz
Keyword(s):  
Black Holes ◽  
Galactic Nuclei ◽  
Compelling Evidence ◽  
Massive Black Holes ◽  
Nearby Galaxies ◽  
Dynamical Constraints

There is now compelling evidence for massive dark objects at the centers of severals galaxies. The possibility that these are black holes (BHs) fits well into the picture where quasars and AGNs are powered by accretion onto a massive BH, so that dead quasar engines should be hiding in many nearby galaxies.

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