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Cosmological Studies from the MRC/1Jy Radio Galaxy Sample: The Spectral Index – Redshift Correlation

Published online by Cambridge University Press:  25 May 2016

R.M. Athreya  and
V.K. Kapahi
R.M. Athreya
Affiliation:
National Centre for Radio Astrophysics, TIFR Pune University Campus, Pune 411007, India
V.K. Kapahi
Affiliation:
National Centre for Radio Astrophysics, TIFR Pune University Campus, Pune 411007, India

Extract

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The MRC/1Jy sample of 559 radio sources with S408 MHz ≥ 0.95 Jy (McCarthy et al. 1996; Kapahi et al. in preparation) is a factor of 5 to 6 times deeper than the 3CRR sample; it is therefore, well suited for disentangling the redshift (z) and luminosity (P) dependence of several properties of extragalaxtic radio sources. Here we present results on the spectral index — redshift correlation for radio galaxies, based on a comparison of the well documented radio spectra (in the rest frame frequency range of about 1 to 16 GHz) of the following two matched-luminosity samples, (a) 14 high redshift radio galaxies (HRRG) from MRC with 2.0 < z < 3.2 and linear size i > 10 kpc, and (b) 21 intermediate z radio galaxies (IRRG) from 3CRR with 0.85 < z < 1.7 and l > 10 kpc. Both samples have P1.4 GHz in the range 1028 and 1028.8 WHz−1.

Type
IV. Structure Formation and Dark Matter
Information
Symposium - International Astronomical Union , Volume 183: Cosmological Parameters and the Evolution of the Universe , 1999 , pp. 251
Copyright
Copyright © Kluwer 1999 

References

Atthreya, R.M. & Kapahi, V.K. (1997), submitted to JAA .Google Scholar
McCarthy, P.J. et al. (1996), ApJS, 107, 19 Google Scholar