An optical inverse-Compton hotspot in 3C196?

Details An optical inverse-Compton hotspot in 3C196? An optical inverse-Compton hotspot in 3C196?

2001-05-14

arxiv.org/abs/astro-ph/0105228v1

Astronomy and Astrophysics

Astrophysics

5 pages. Accepted for A&A (research note). Uses A&A class file v 5.0.1 (included)

Scientific paper

10.1051/0004-6361:20010687

Several hotspots of FRII radio sources have previously been detected in the X-ray at a flux level consistent with the X-rays being due to inverse-Compton scattering of radio synchrotron photons (`synchrotron self-Compton'), if the magnetic fields in the hotspots are close to their equipartition values. However, the number of hotspots compact and bright enough to exhibit detectable X-ray emission is small, so it is worth searching for synchrotron self-Compton emission in the optical, in spite of the obvious observational difficulties of such an approach. In this note I report on a possible detection of an optical inverse-Compton hotspot in a deep Hubble Space Telescope observation of the distant quasar 3C196, at a level which implies a hotspot magnetic field strength close to equipartition if the electrons have a low-energy cutoff around gamma ~ 500.

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