Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..611p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 196, Aug. 1981, p. 611-633. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
92
Cosmology, Evolution (Development), Extragalactic Radio Sources, Luminosity, Radio Spectra, Red Shift, Series Expansion
Scientific paper
New models are presented for the epoch dependence of extragalactic radio source luminosity functions, derived on the assumption that radio sources may be divided into two distinct populations: (1) the extended, steep-spectrum sources, and (2) the compact, flat-spectrum ones. To obtain models that are consistent with the data, the luminosity functions for each of the two spectral classes are expressed as free series expansions in luminosity and redshift and the expansion coefficients that yield the best-fitting models are found iteratively. It is found that, although the luminosity function is poorly defined and a variety of evolutionary histories are possible, both the steep-spectrum and flat-spectrum sources appear to behave similarly. Powerful sources of either type undergo strong evolution.
Gull Stephen F.
Peacock John A.
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