Seyfert galaxies and quasars /Petrie Lecture/

Details Seyfert galaxies and quasars /Petrie Lecture/ Seyfert galaxies and quasars /Petrie Lecture/

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jrasc..72..121o&link_type=abstract

(Canadian Astronomical Society, Meeting, 8th, London, Ontario, Canada, May 26, 1977.) Royal Astronomical Society of Canada, Jour

Astronomy and Astrophysics

Astronomy

8

Astronomical Spectroscopy, Galactic Structure, Quasars, Seyfert Galaxies, Spectrum Analysis, Continuous Spectra, Emission Spectra, Line Spectra, Nonthermal Radiation, Spectral Energy Distribution

Scientific paper

Seyfert galaxies and quasars are looked at first from the standpoint of the continuous spectrum and second in terms of the emission-line spectrum. Seyferts of type II are distinct from those of type I whereas quasars appear to be very luminous type I Seyferts. The nonthermal continuum components come from a region with an extent on the order of one parsec. The broad-line emission region is probably a few parsecs in extent while the sharper lines come from a much larger volume. Narrow emission lines may occur up to a few hundred parsecs from the center of a Seyfert and as far away as 10,000 parsecs from a quasar nucleus.

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