The origins of X-ray emission from the hotspots of FRII radio sources

Details The origins of X-ray emission from the hotspots of FRII radio sources The origins of X-ray emission from the hotspots of FRII radio sources

2004-05-26

arxiv.org/abs/astro-ph/0405516v2

Astrophys.J. 612 (2004) 729-748

Astronomy and Astrophysics

Astrophysics

49 pages, 16 figures. ApJ accepted. Revised version fixes a typo in one of the Tables and corrects a statement about 3C273

Scientific paper

10.1086/422808

We use new and archival Chandra data to investigate the X-ray emission from a large sample of compact hotspots of FRII radio galaxies and quasars from the 3C catalogue. We find that only the most luminous hotspots tend to be in good agreement with the predictions of a synchrotron self-Compton model with equipartition magnetic fields. At low hotspot luminosities inverse-Compton predictions are routinely exceeded by several orders of magnitude, but this is never seen in more luminous hotspots. We argue that an additional synchrotron component of the X-ray emission is present in low-luminosity hotspots, and that the hotspot luminosity controls the ability of a given hotspot to produce synchrotron X-rays, probably by determining the high-energy cutoff of the electron energy spectrum. It remains plausible that all hotspots are close to the equipartition condition.

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