Radial density and density evolution of radio galaxies in the Las Campanas redshift survey

Details Radial density and density evolution of radio galaxies in the Las Campanas redshift survey Radial density and density evolution of radio galaxies in the Las Campanas redshift survey

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...370..923m&link_type=abstract

Astronomy and Astrophysics, v.370, p.923-930 (2001)

Astronomy and Astrophysics

Astrophysics

2

Galaxies: Active, Galaxies: Evolution, Radio Continuum: Galaxies

Scientific paper

The sample of 1157 radio-identified galaxies from the Las Campanas Redshift Survey (LCRS) (Machalski & Condon \cite{r9}) is used to determine the radial density of both star-forming (starburst) and AGN-type galaxies with the mean redshift of 0.07 and 0.18, respectively. It is shown that the radial density distribution of these radio galaxies is essentially different from the respective distribution of optical galaxies in the parent LCRS sample. While the optical galaxies reveal a systematic decrease of their spatial density with redshift (which likely is due to some incompleteness of the optical sample increasing with the apparent isophotal magnitude of galaxies), the radio-emitting galaxies exhibit evident positive evolution of their radial density with redshift. Moreover, most of this density evolution is connected to starburst-type galaxies whose evolution can be parametrized by g(z)~ (1+z){2.5+/- 0.5}. No evident density evolution is detected in LCRS AGN galaxies. Correcting the 1.4 GHz luminosity function (RLF) (Machalski & Godlowski \cite{r10}) for the above density evolution in starbursts and assuming its lack in AGN, a pure luminosity evolution f(z)~ (1+z){2.4+/- 0.9} is found for AGN galaxies after the comparison of the corrected RLF with the local luminosity function based on nearby UGC galaxies (cf. Condon \cite{r3}). Oppositely, no significant luminosity evolution in starbursts is found.

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