Synchrotron self-Compton Emission from the Radio Hot Spots of Cygnus A

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Hst Proposal Id #9123 Agn/Quasars

Scientific paper

We have recently studied the radio galaxy Cygnus A in X-rays with Chandra. All four of the radio hot spots are detected with similar morphologies to the radio maps. The X-ray emission is almost certainly synchrotron self- Compton emission from the radio synchrotron emitting electrons. The predictions of this model are in excellent agreement with the Chandra spectra and also imply a magnetic field strength close to equipartition. We propose here to image the predicted SSC emission from the hot spots in the optical with HST. Our goals are a} to confirm the optical fluxes predicted by the SSC model, and b} to use the radio synchrotron and optical SSC brightness distributions at eq 0.1 arc sec resolution to determine the internal structures of the magnetic fields and relativistic particles within the two brighter hot spots {A and D}.

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