Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.280...20k&link_type=abstract
Nature, vol. 280, July 5, 1979, p. 20-23. Research supported by the Nederlandse Organisatie voor Zuiver-Wetenschappelijk Onderzo
Astronomy and Astrophysics
Astronomy
32
Astronomical Photometry, Radio Galaxies, Red Shift, Space Density, Color, Graphs (Charts), Radio Sources (Astronomy), Radio Spectra, Radio Telescopes, Tables (Data)
Scientific paper
The apparent magnitudes of radio galaxies optically identified on plates from the Palomar and Kitt Peak telescopes have been used to derive the redshifts of these galaxies, and the radio luminosity function of elliptical galaxies has been studied as a function of redshift. For moderate and intermediate radio luminosities, no increase in density is observed out to redshifts of 0.2 to 0.3. However, the proper density of the radio galaxy population increases sharply beyond that epoch, reaching enhancement factors of about 30 at redshifts of about 0.5. This increase is observed even for sources of intermediate luminosities. Radio luminosity function estimates using blue and red magnitudes are in qualitative agreement. The quantitative difference can be explained if it is assumed that the distance radio galaxies are intrinsically bluer than local giant elliptical galaxies.
de Ruiter Hans R.
Katgert Peter
van der Laan Harry
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