A determination of the local radio luminosity function of radiogalaxies at 408 MHz

Details A determination of the local radio luminosity function of radiogalaxies at 408 MHz A determination of the local radio luminosity function of radiogalaxies at 408 MHz

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241...35b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 35-41.

Astronomy and Astrophysics

Astrophysics

1

Luminosity, Radio Emission, Radio Galaxies, Astronomical Catalogs, Irregular Galaxies, Spatial Distribution, Spiral Galaxies, Radiogalaxies, Optical Identifications, Luminosity Functions

Scientific paper

We present 107 new optical identifications of radio- sources from the B 3 survey with galaxies in the Catalog of Galaxies and of Clusters of Galaxies (CGCG) catalogue. Special care has been devoted to accurately determinate rms positional errors and to derive the luminosity distribution of random contaminants. Furthermore, statistical incidence of extended double radiosources in the identification content has been examined and discussed.
The sample of optical identifications has been employed to estimate the local (z < 0.1) radio luminosity function (LRLF) of radiogalaxies at 408 MHz, in the range 1020.4-1025.6 W/Hz (H0 = 100).
As usual, S-Irr galaxies dominate the LRLF at low radio powers, but the contribution of E-S0 galaxies, in this range, seems more substantial than previously claimed, confirming a recent finding by Sadler et al. (1989). In particular, no evidence was found for the so-called "break" in the LRLF of E-S0 galaxies.
The present determination of the LRLF has been compared with some previous estimates by means of a χ2 goodness of fit test. The test showed some inconsistency between all functions analysed.
We suggest that such discrepancies, although possibly due to various error underestimates, could be connected to spatial anisotropies of the nearby Universe.

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