An investigation of the redshift-dependence of the radio spectral index among powerful double radio sources

Details An investigation of the redshift-dependence of the radio spectral index among powerful double radio sources An investigation of the redshift-dependence of the radio spectral index among powerful double radio sources

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192...37g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 37-41.

Astronomy and Astrophysics

Astrophysics

23

Astronomical Spectroscopy, Extragalactic Radio Sources, Red Shift, Luminosity, Radio Spectra, Spectrum Analysis

Scientific paper

Using two flux-limited, meter-wavelength samples of extragalactic sources, for which multifrequency measurements of flux density as well as essentially complete redshift information are now available, the spectral properties are analyzed, based on spectral indices alpha(1e) and alpha(2e) determined at 1 and 2 GHz in the rest frame of the source. Both samples are selected at 408 MHz and represent sources observed at high and intermediate flux densities, for which median values of redshift are about 0.2 and 1.4, respectively. The near constancy of the intrinsic spectral index over the flux density range, from about 25 Jy to 1 Jy at 408 MHz, suggests that the steepening of alpha with redshift reported in the literature, if real, probably does not continue to early cosmological epochs.

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