The redshift dependence of spectral index in powerful radio galaxies.

Details The redshift dependence of spectral index in powerful radio galaxies. The redshift dependence of spectral index in powerful radio galaxies.

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998japa...19...63a&link_type=abstract

Journal of Astrophysics and Astronomy, Vol. 19, No. 3 - 4, p. 63 - 77

Astronomy and Astrophysics

Astrophysics

9

Radio Galaxies: Spectral Indices, Radio Galaxies: Redshifts

Scientific paper

The authors present and discuss in this paper the rest frame radio spectra (1 - 25 GHz) of a sample of fifteen radio galaxies at z > 2 from the newly defined MRC/1Jy complete sample of 558 radio sources. These galaxies are among the most powerful radio sources known and range in luminosity from 1028 - 1028.8 Watt Hz-1 at 1 GHz. The authors find that the median rest frame spectral index of this sample of galaxies at z > 2 is significantly steeper than that of a matched luminosity sample of 3CRR galaxies which are at a much lower redshift (0.85 < z <1.7). This indicates that spectral index correlates primarily with redshift, at least in the luminosity range considered here. The authors suggest a new explanation for the steeper spectra of radio galaxies at high redshift involving steeper electron energy spectra at injection.

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