PKS 0405--385: the smallest radio quasar?

Details PKS 0405--385: the smallest radio quasar? PKS 0405--385: the smallest radio quasar?

1997-10-06

arxiv.org/abs/astro-ph/9710057v1

Astronomy and Astrophysics

Astrophysics

13 pages, 3 PostScript figures, to appear in ApJL

Scientific paper

10.1086/311001

We have observed profound variability in the radio flux density of the quasar PKS 0405-385 on timescales of less than an hour; this is unprecedented amongst extragalactic sources. If intrinsic to the source, these variations would imply a brightness temperature 10^21 K, some nine orders of magnitude larger than the inverse Compton limit for a static synchrotron source, and still a million times greater than can be accommodated with bulk relativistic motion at a Lorentz factor equal to 10. The variability is intermittent with episodes lasting a few weeks to months. Our data can be explained most sensibly as interstellar scintillation of a source component which is < 5 microarcsec in size - a source size which implies a brightness temperature > 5 times 10^14 K, still far above the inverse Compton limit. Simply interpreted as a steady, relativistically beamed synchrotron source, this would imply a bulk Lorentz factor 1000.

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