The origin of the extragalactic background radiation between 0.5 and 400 MHz

Details The origin of the extragalactic background radiation between 0.5 and 400 MHz The origin of the extragalactic background radiation between 0.5 and 400 MHz

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.180..429s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 180, Aug. 1977, p. 429-445.

Statistics

Computation

17

Background Radiation, Extragalactic Radio Sources, Radio Spectra, Self Absorption, Synchrotron Radiation, Astronomical Models, Compton Effect, Cosmology, Cygnus Constellation, Luminosity, Radiant Flux Density, Red Shift

Scientific paper

High-resolution maps of brightness distribution for a 'complete' sample of more intense extragalactic radio sources over the range from 0.5 to 400 MHz are used to investigate the origin of the isotropic component of the observed radio background radiation. The low-frequency turnover in the spectrum of the isotropic component is attributed to synchrotron self-absorption in the spectra of the discrete sources that comprise the background. The overall source spectrum in the indicated frequency range is derived, and Cyg A is studied as a test case. The integrated spectrum is calculated first for a model in which all sources have the spectrum of Cyg A and then in a more general manner by assuming that a 'complete' sample of 80 intense sources is typical of the whole source population; the variation of cosmological evolution with radio luminosity is taken into account in these computations. The results show that: (1) the superposition of extragalactic radio sources results in a predicted extragalactic background that makes up a large fraction of that derived from observations in the frequency range considered; (2) low-luminosity sources inadequately represented by the 'complete' sample may make a comparable contribution to the background at low frequencies; and (3) a large fraction of the background originates in sources at moderate redshifts.

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