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Colors of Radio Galaxies at High Redshifts

Published online by Cambridge University Press:  14 August 2015

Rogier A. Windhorst ,
Richard G. Kron ,
David Koo  and
Peter Katgert
Rogier A. Windhorst
Affiliation:
Sterrewacht, Leiden
Richard G. Kron
Affiliation:
Yerkes Observatory, Chicago
David Koo
Affiliation:
Astronomy Department, Berkeley
Peter Katgert
Affiliation:
Sterrewacht, Leiden

Extract

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In this paper we present the first results of the Westerbork-Berkeley Deep Survey, the purpose of which is to derive the epoch dependence of the radio luminosity function (RLF) and the optical spectral energy distribution (SED) of elliptical radio galaxies. From calibrated photographic photometry we conclude that no spectral evolution is seen for z ≲ 0.4, but that colors of radio galaxies are bluer for 0.4 ≲ z ≲ 0.9 than predicted from classical model spectra for ellipticals (with star formation only during the first 109 yrs after formation). First-ranked cluster radio galaxies may be slightly bluer than the average radio galaxy for z ≳ 0.6. The epoch dependence of the 1.4 GHz RLF is determined in a direct way. We find almost no population evolution for z ≲ 0.3, but strong evolution for 0.3 ≲ z ≲ 0.9 for all radio powers above the break in the RLF, with enhancement factors of ∼ 100 at z ∼ 0.8.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 97: Extragalactic Radio Sources , 1982 , pp. 427 - 431
Copyright
Copyright © Reidel 1982 

References

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