Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986azh....63..426s&link_type=abstract
(Astronomicheskii Zhurnal, vol. 63, May-June 1986, p. 426-433) Soviet Astronomy (ISSN 0038-5301), vol. 30, May-June 1986, p. 256
Astronomy and Astrophysics
Astronomy
3
Astronomical Spectroscopy, Decametric Waves, Extragalactic Radio Sources, Radiant Flux Density, Spatial Distribution, Evolution (Development), Radio Frequencies, Spectrum Analysis
Scientific paper
Samples of radio sources from a decameter-wave band survey are used to determine the parameters of the differential number-flux-density relation n(S)dS = kS-γdS at the frequency 25 MHz by the direct count method. For flux densities 80 ⪆ S ⪆ 20 Jy, the parameter γ is γ1 = 2.84±0.08. This value is in good agreement with similar estimates obtained for higher frequencies. The number of sources with flux densities S > 80 Jy observed at 25 MHz decreases more rapidly (γ2 > 3.7) than at higher frequencies which is evidence for a strong evolution of the extended radio sources with steep spectra. It is shown that for sources with fluxes below the direct count limit (S < 20 Jy) the parameters of the n(S) relation should differ from those presented.
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