Radio spectra for sources selected at 408 MHz

Details Radio spectra for sources selected at 408 MHz Radio spectra for sources selected at 408 MHz

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.177..441m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 177, Nov. 1976, p. 441-462.

Astronomy and Astrophysics

Astronomy

25

Astronomical Catalogs, Microwave Spectra, Radio Sources (Astronomy), Radio Spectra, Error Analysis, Galactic Radio Waves, Quasars, Tables (Data)

Scientific paper

Radio spectra are presented for a complete sample of 133 sources from the Molonglo catalogs having flux densities above 0.97 Jy at 408 MHz. All measurements were made by means of drift scans at frequencies of 178, 318, 408, 606, 1400, or 2695 MHz. A comparison of the spectral indices of the present sample with those of a separate sample of stronger sources selected at 408 MHz shows that the mean spectral index increases for weaker sources (i.e., the spectrum becomes steeper), although this trend is less marked than in the case of sources selected at a higher frequency. The mean spectral indices are tabulated according to optical identification for normal-spectrum sources, and it is found that the spread within each class is quite small.

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