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On the Way AGN's Turn Off

Published online by Cambridge University Press:  19 July 2016

D. Friedli
D. Friedli*
Affiliation:
Geneva Observatory, CH-1290 Sauverny, Switzerland Steward Observatory, University of Arizona, Tucson AZ 85721, USA

Extract

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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?

Type
Poster contributions: Statistical Studies and Evolution
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 504
Copyright
Copyright © Kluwer 1994 

References

1. Friedli, D., Benz, W., 1993, A&A 268, 65 Google Scholar
2. Friedli, D., Martinet, L., 1993, A&A, 277, 27 Google Scholar
3. Friedli, D., 1993, in: Mass-Transfer Induced Activity in Galaxies, Lexington Conference, ed. Shlosman, I. Cambridge University Press, Cambridge, in press Google Scholar