Mathematics – Probability
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..635r&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, May 1, 1977, p. 635-647. Research supported by the Science Research Council.
Mathematics
Probability
52
Astronomical Models, Galactic Nuclei, Probability Distribution Functions, Quasars, Radio Galaxies, Seyfert Galaxies, Spiral Galaxies, Astrophysics, Elliptical Galaxies, Galactic Evolution, Galactic Structure, Infrared Radiation, Radiant Flux Density, Radio Sources (Astronomy)
Scientific paper
A scheme is presented which unites quasars, radio galaxies, N galaxies, and Seyfert galaxies into a single picture of activity in galaxies. Probability functions are given for optical and radio cores, and extended radio sources (in the case of ellipticals), for both spirals and ellipticals. Activity occurs in galaxies of all luminosities, but the strength of it is made proportional to galaxy luminosity. It is assumed that there is dust surrounding the optical cores in order to explain the strong infrared emission in Seyferts. Quasars may, in this picture, occur in both spirals and ellipticals; in fact, most optically selected QSOs are predicted to be in spirals.
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