The Knotty Question of the Jet of PKS B1421-490

Details The Knotty Question of the Jet of PKS B1421-490 The Knotty Question of the Jet of PKS B1421-490

2005-09-08

arxiv.org/abs/astro-ph/0509205v1

Astrophys.J.632:L75-L78,2005

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. Accepted to Astrophysical Journal Letters. Related materials and a higher resolution version of figure 1 m

Scientific paper

10.1086/497823

We report the discovery of unusually strong optical and X-ray emission associated with a knot in the radio jet of PKS B1421-490. The knot is the brightest feature observed beyond the radio band, with knot/core flux ratios \~300 and 3.7 at optical and X-ray frequencies. We interpret the extreme optical output of the knot as synchrotron emission. The nature of the X-ray emission is unclear. We consider a second synchrotron component, inverse Compton emission from a relativistic, decelerating jet, and the possibility that this feature is a chance superposition of an unusual BL Lac object.

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