Issue |
A&A
Volume 370, Number 3, May II 2001
|
|
---|---|---|
Page(s) | 923 - 930 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20010304 | |
Published online | 15 May 2001 |
Radial density and density evolution of radio galaxies in the Las Campanas redshift survey
Astronomical Observatory, Jagellonian University, ul. Orla 171, 30244 Cracow, Poland
Corresponding author: J. Machalski, machalsk@oa.uj.edu.pl
Received:
23
November
2000
Accepted:
27
February
2001
The sample of 1157 radio-identified galaxies from the Las Campanas Redshift
Survey (LCRS) (Machalski & Condon [CITE]) 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
. No evident density evolution is detected in
LCRS AGN galaxies.
Correcting the 1.4 GHz luminosity function (RLF) (Machalski & Godlowski [CITE])
for the above density evolution in starbursts and assuming its lack in AGN, a
pure luminosity evolution
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]). Oppositely, no
significant luminosity evolution in starbursts is found.
Key words: galaxies: active / galaxies: evolution / radio continuum: galaxies
© ESO, 2001
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