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.

scholarly journals On the Way AGN's Turn Off

1994 ◽  
Vol 159 ◽  
pp. 504-504
Author(s):  
D. Friedli
Keyword(s):  
Black Holes ◽  
Active Galactic Nuclei ◽  
Large Scale ◽  
Galactic Nuclei ◽  
Central Mass ◽  
Massive Black Holes ◽  
Present Epoch ◽  
Nearby Galaxies ◽  
The Way

Observations of nearby galaxies indicate non-negligible (dark) mass in their nuclei, interpreted either as very dense clusters or Massive Black Holes (MBH's). The latter hypothesis is supported by the widespread idea that MBH's can be the engine powering Active Galactic Nuclei (AGN's), and that interaction- or bar-induced central mass accretion can feed MBH's with large scale, plentiful fuel. However, there are fewer AGN's at the present time than at high redshifts, although many if not all bright galaxies must harbour relics of central active MBH's. How can we explain the fact that some AGN's are now turned off? Is it only due to the exhaustion or evaporation of the available fuel, and/or to the lower rate of interactions at the present epoch?

scholarly journals Emission from the Nuclei of Nearby Galaxies: Evidence for Massive Black Holes?

1978 ◽  
Vol 77 ◽  
pp. 237-244 ◽  
Author(s):  
M.J. Rees
Keyword(s):  
Black Holes ◽  
Physical Mechanism ◽  
Residual Activity ◽  
Galactic Nuclei ◽  
Slow Motion ◽  
Stellar Activity ◽  
Massive Black Holes ◽  
Low Level ◽  
Nearby Galaxies

The non-stellar activity in the nuclei of nearby galaxies poses problems of its own. But it gains added interest insofar as it may provide clues to the nature of quasars and the unusually energetic nuclei of some more remote galaxies. The evident qualitative resemblance between these spectacular phenomena and some of the nearby galactic nuclei discussed at this symposium suggests that we may be witnessing a scaled-down or slow-motion version of the same physical mechanism; and the likelihood that dead quasars vastly outnumber living ones suggests that defunct remnants - perhaps displaying some low-level residual activity - may lurk in the centres of most large galaxies.

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.

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 Quasar Evolution and the Growth of Black Holes in the Nuclei of Active Galaxies

1989 ◽  
Vol 134 ◽  
pp. 233-239
Author(s):  
R. D. Blandford
Keyword(s):  
Black Holes ◽  
Active Galactic Nuclei ◽  
Radiation Pressure ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Rapid Decrease ◽  
Active Galaxies ◽  
Host Galaxy ◽  
Nearby Galaxies ◽  
The Mean

The observed evolutionary behavior of active galactic nuclei is compatible with a model in which black holes form in the nuclei of new-born galaxies and then grow at a rate limited by both radiation pressure and the supply of gas. Individual sources become more luminous with time as long as they are being fueled. However, the rapid decrease in the mean rate of supply of gas causes a strong decline in the space density of active objects. Nearby galaxies should harbor modest size (∼ 106 – 108 M⊙) black holes. It is suggested that the gas that fuels high redshift quasars is mostly derived from the host galaxy.

scholarly journals THE SPATIAL CLUSTERING OFROSATALL-SKY SURVEY ACTIVE GALACTIC NUCLEI. IV. MORE MASSIVE BLACK HOLES RESIDE IN MORE MASSIVE DARK MATTER HALOS

2015 ◽  
Vol 815 (1) ◽  
pp. 21 ◽  
Author(s):  
Mirko Krumpe ◽  
Takamitsu Miyaji ◽  
Bernd Husemann ◽  
Nikos Fanidakis ◽  
Alison L. Coil ◽  
...  
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Active Galactic Nuclei ◽  
Spatial Clustering ◽  
Galactic Nuclei ◽  
Dark Matter Halos ◽  
Massive Black Holes ◽  
Sky Survey
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