Restrictions on models for superlight flux variations in radio sources

Details Restrictions on models for superlight flux variations in radio sources Restrictions on models for superlight flux variations in radio sources

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..474j&link_type=abstract

Astrophysical Journal, Part 1, vol. 215, July 15, 1977, p. 474-482.

Astronomy and Astrophysics

Astronomy

36

Astronomical Models, Radiant Flux Density, Radio Sources (Astronomy), Relativistic Velocity, Synchrotron Radiation, Blasts, Cosmology, Deceleration, Luminous Intensity, Relativity

Scientific paper

Relativistically expanding spherical synchrotron sources are examined in terms of their spectral time evolution and brightness distributions to determine how effectively they produce observable superlight flux variations - variations in which the spectral flux changes are faster than light travel across the apparent source radius. It is shown that the flux variations are apparently superlight only when a large fraction of the flux comes from regions of the source which appear to exhibit superlight velocities. Relativistic extensions of the homologous adiabatic expanding source model tend to produce a centrally condensed brightness distribution, and do not produce superlight variations except at frequencies far below the spectral peak. Sources with shell structure more easily produce superlight effects. Expressions are derived for the apparent shape of a relativistically expanding source, generalized to include the effects of deceleration. It is seen that deceleration significantly influences the apparent evolution of such sources. Dynamical arguments necessitate very large energy supplies to relativistically expanding sources unless the ambient medium has very low density.

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