Differential information on the evolution of extragalactic sources from spectral index distributions

Details Differential information on the evolution of extragalactic sources from spectral index distributions Differential information on the evolution of extragalactic sources from spectral index distributions

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131l...1d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 1, Feb. 1984, p. L1-L4. Research supported by the Consiglio Nazionale

Astronomy and Astrophysics

Astronomy

3

Astronomical Spectroscopy, Extragalactic Radio Sources, X Ray Astronomy, Active Galactic Nuclei, Evolution (Development), Luminosity, Red Shift

Scientific paper

The dependence of the average spectral index of extragalactic sources on luminosity in complete samples selected at different frequencies is shown to vary in a manner that directly reflects their evolutionary properties. In particular, easily recognizable features are introduced by a luminosity dependent evolution and by the presence of a cutoff in the redshift distribution. The expected dependence on luminosity of the average optical to X-ray energy index αox for X-ray selected active galactic nuclei is discussed in some detail.

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