Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..799h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Nov. 1983, p. 799-809.
Astronomy and Astrophysics
Astronomy
31
Black Holes (Astronomy), Galactic Nuclei, Quasars, Bl Lacertae Objects, Optical Emission Spectroscopy, Radio Astronomy, Seyfert Galaxies
Scientific paper
The basic phenomenon characterizing a QSO is believed to be accretion of material by a supermassive (10 to the 8th solar-mass) black hole (SBH) at the nucleus of a galaxy. Arguments and recent evidence are presented which strongly support this view. Continuum radiation from QSOs can be modeled by an accretion disk, a hot blackbody, and line blends. Optical imaging reveals underlying galaxies, frequently disturbed by an encounter which may be the fueling process. Radio imaging reveals the sometimes complex history of the SBH spin axis, and together with radio VLBI, optical, and X-ray variability, indicates relativistic ejection velocities. Optical and UV line profiles yield clues as to the central geometry and possible binary nature of some galactic nuclei. Various current difficulties are described, and the place of BL Lacertae objects and Seyfert galaxies in the overall scenario are discussed.
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