Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218..265p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Jan. 15, 1986, p. 265-278.
Astronomy and Astrophysics
Astronomy
63
Extragalactic Radio Sources, Luminosity, Quasars, Radio Emission, Magnitude, Red Shift, Seyfert Galaxies, Ultraviolet Astronomy
Scientific paper
The radio properties of quasars have traditionally been discussed in terms of the radio-to-optical flux-density ratio R, implying a correlation between emission in these wavebands. The authors show that, for bright quasars, this apparent correlation is largely due to an abrupt change in the radio properties of the quasar population near absolute magnitude MB = -24. They suggest that this change is due to the existence of two classes of quasar with different host galaxies. Furthermore, the fraction of quasars detected above a given radio luminosity threshold decreases at higher redshifts (at constant MB): this may also be explained by two separately evolving populations of quasars. Within this framework, the authors demonstrate that existing data cannot establish whether or not radio and optical luminosities are correlated, as the optical luminosity functions for the two classes are in general different.
Longair Malcolm S.
Miller Lance L.
Peacock John A.
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