Variability, Brightness Temperature, Superluminal Motion, Doppler Boosting, and Related Issues

Details Variability, Brightness Temperature, Superluminal Motion, Doppler Boosting, and Related Issues Variability, Brightness Temperature, Superluminal Motion, Doppler Boosting, and Related Issues

2003-04-09

arxiv.org/abs/astro-ph/0304165v1

Astronomy and Astrophysics

Astrophysics

To be published in "Radio Astronomy at the Fringe", ASP Conf. Ser. Vol. 300, J. A. Zensus, M. H. Cohen, & E. Ros (Eds.). 8 pag

Scientific paper

We review the observations of rapid flux density variations in compact radio sources, and discuss the inverse Compton limit to the maximum brightness temperature of incoherent synchrotron sources in comparison with recent VLBA observations. The apparent agreement of the theoretical brightness temperature limit due to inverse Compton cooling and the brightness temperatures observed by early VLBI observations appears to have been fortuitous. VLBA observations have greatly improved the quality of the data, but many of the early issues remain unresolved.

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