Radio spectra of non-uniform synchrotron sources with internal absorption

Details Radio spectra of non-uniform synchrotron sources with internal absorption Radio spectra of non-uniform synchrotron sources with internal absorption

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....52..439d&link_type=abstract

Astronomy and Astrophysics, vol. 52, no. 3, Nov. 1976, p. 439-447.

Astronomy and Astrophysics

Astrophysics

72

Galactic Radiation, Radiant Flux Density, Radio Spectra, Self Absorption, Synchrotron Radiation, Thermal Absorption, Elliptical Galaxies, Ionized Gases, Optical Thickness, Quasars, Radiative Transfer, Radio Galaxies, Relativistic Plasmas, Seyfert Galaxies

Scientific paper

Relationships between the flux density and frequency of a nonuniform synchrotron source at frequencies where the source experiences internal absorption are derived for axisymmetric disklike sources and spherically symmetric sources. Both synchrotron self-absorption and free-free absorption by an ionized thermal plasma are considered. The radiative-transfer problem for spherical source models with various values of the governing parameters is numerically integrated in order to check the validity of the derived equations and determine the spectra in transition frequency ranges. It is found that there is perfect agreement with the theoretical expectations in the frequency range where a power-law spectrum holds. Extension of the calculations to other geometries is discussed along with the observational distinction between the two types of absorption considered, and radio variability in nonuniform sources. The spectra of the radio cores of elliptical galaxies and the radio sources in Seyfert galaxies are interpreted on the basis of the results obtained.

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