Analysis of the mean spectral index-flux density relationship for extended components of extragalactic radio sources

Details Analysis of the mean spectral index-flux density relationship for extended components of extragalactic radio sources Analysis of the mean spectral index-flux density relationship for extended components of extragalactic radio sources

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989azh....66.1121s&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 66, Nov.-Dec. 1989, p. 1121-1131. In Russian.

Statistics

Computation

2

Astronomical Spectroscopy, Extragalactic Radio Sources, Flux Density, Computational Astrophysics, Evolution (Development), Red Shift

Scientific paper

Preliminary estimation of the theoretical possibility of detecting statistically significant variations in average values of the spectral index for radio source samples of different intensities is discussed. The preliminary numerical estimate of the expected range of variation for extended sources is in good agreement with observed variations in distributions of low-frequency (from 25 to 178 MHz) spectral indices in samples of sources with different intensities. An analysis is made of the possible physical reasons for the existence in different frequency ranges of observed spectral-index/flux-density relationships. Questions of the astrophysical significance of these relationships and their possible applications are discussed as well. The observed increase in average values of the spectral index for extended radio sources as their flux densities decrease agrees with the assumption that a correlation exists between low-frequency spectral index values for the sources and their redshifts.

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