Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113..150g&link_type=abstract
Astronomy and Astrophysics, vol. 113, no. 1, Sept. 1982, p. 150-154.
Astronomy and Astrophysics
Astrophysics
27
Astronomical Spectroscopy, Extragalactic Radio Sources, Radiant Flux Density, Astronomical Catalogs, Data Sampling, Statistical Correlation, Ultrahigh Frequencies
Scientific paper
The dependence of the decimeter wave spectral index on the 408 MHz flux density for extragalactic radio sources is investigated by examining the two-point spectral indices of 1330 sources, and a statistically significant correlation is found. At high flux densities (10-15 Jy), the median spectral index is minus 0.81 plus or minus 0.017, increasing to minus 0.91 plus or minus 0.01 at flux densities of 1-2 Jy, only to return to a value of minus 0.78 plus or minus 0.015 at low flux densities of 0.1-0.4 Jy. Such behavior of the median spectral index is evidence that radio sources occurring in intermediate flux density samples are statistically most luminous, in view of the reported correlation between higher intrinsic radio luminosity and greater spectral index.
Gopal-Krishna
Steppe H.
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