Extragalactic radio sources

Details Extragalactic radio sources Extragalactic radio sources

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8426557s&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Electron Distribution, Magnetic Flux, Plasmas (Physics), Radio Sources (Astronomy), Adiabatic Conditions, Luminosity, Mathematical Models, Pressure Effects, Relativistic Effects, Synchrotron Radiation

Scientific paper

The standard model for extragalactic variable radio sources comprises an isotropically expanding plasmoid with frozen magnetic flux and an electron distribution which evolves adiabatically. This model leads to the following relaton between the peak luminosity L nu, m and the relevant frequency num which are functions of time: Lnu,m is proportional to num(n) where N = (7n + 5)/(4n + 5). In this expression, n is the spectral index in the optically thin part of the spectrum, where L nu is proportional to nu (-n). For n in the range 0.5 to 1.5, the standard model yields N in the range 1.2 to 1.4. By contrast, analysis of observational data yields estimates of N in a small range about the mean value 0.4, in clear contradiction with the standard model.

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