Further evidence for the strong steepening of the median radio spectrum with decreasing intensity of sources selected at 5 GHz

Details Further evidence for the strong steepening of the median radio spectrum with decreasing intensity of sources selected at 5 GHz Further evidence for the strong steepening of the median radio spectrum with decreasing intensity of sources selected at 5 GHz

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99..388m&link_type=abstract

Astronomy and Astrophysics, vol. 99, no. 2, June 1981, p. 388-391.

Astronomy and Astrophysics

Astronomy

4

High Frequencies, Microwave Emission, Radio Sources (Astronomy), Radio Spectra, Spectral Energy Distribution, Data Sampling, Histograms, Quasars, Radiant Flux Density

Scientific paper

Results are presented of a comparison of the spectral indices of radio sources selected at 5 GHz with their 5-GHz intensities which provides further evidence for the strong steepening of the radio spectrum with decreasing flux density. Distributions of spectral index between 5000 and 1400 MHz are compared for radio sources of 5-GHz intensity greater than or equal to 800 mJy of Witzel et al. (1979), sources selected from the S5 installment of the NRAO-Bonn survey with intensity between 250 and 800 mJy, and sources selected from the 4755-MHz survey of Ledden et al. (1980) with intensity between 40 and 250 mJy. As 5-GHz flux density decreases, it is observed that (1) the secondary peak of the spectral index distribution decreases; (2) the main peak of the distribution is shifted to steeper values; and (3) the dispersion systematically decreases. It is pointed out that further optical identifications of faint radio sources at 5 GHz are required to determine whether the observed steepening is due to a decline of quasars, or a variation in quasar spectral properties with increasing distance.

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