Maximum brightness temperature for an incoherent synchrotron radio source

Details Maximum brightness temperature for an incoherent synchrotron radio source Maximum brightness temperature for an incoherent synchrotron radio source

2009-09-10

arxiv.org/abs/0909.1905v1

Singal, A. K. 2009, in ApSS Proc., Turbulence, Dynamos, Accretion Disks, Pulsars and Collective Plasma Processes, ed. S. S. Ha

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, Proceedings of the First Kodai-Trieste Workshop on Plasma Astrophysics, August 27-September 7, 2007

Scientific paper

We discuss here a limit on the maximum brightness temperature achievable for an incoherent synchrotron radio source. This limit, commonly referred to in the literature as an inverse Compton limit, prescribes that the brightness temperature for an incoherent synchrotron radio source may not exceed ~10^{12} K, a fact known from observations. However one gets a somewhat tighter limit on the brightness temperatures, T_{b}~10^{11.5} K, independent of the inverse Compton effects, if one employs the condition of equipartition of energy in magnetic fields and relativistic particles in a synchrotron radio source. Pros and cons of the two brightness temperature limits are discussed.

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