Substructure of the X-ray hotspots in Cygnus A

Details Substructure of the X-ray hotspots in Cygnus A Substructure of the X-ray hotspots in Cygnus A

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..745..540b&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: 2nd International Symposium on High Energy Gamma-Ray Astronomy. AIP Conference Proceedings, Vo

Astronomy and Astrophysics

Astronomy

Radio Galaxies, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

Our new analysis of the observation of Cygnus A made with Chandra in 2000, reveal previously unknown hard structures in the form of arcs and less extended spots around the hotspots, in which the hardness is significantly enhanced compared with the central regions. The hard arcs may constitute the first detection of the bow shock; the weaker hard spots may reveal the sites where the jets impact on the hotspot structures and indicate continuing jet activity still powering not only the primary, but also the secondary Cyg A hotspots. As the hard features cannot result from the old-population of the shock-generated electrons radiating by the SSC process we consider two other possible sources of the hard emission: thermal radiation of hot intracluster gas compressed at the bow shock and/or non-thermal synchrotron radiation of electrons accelerated in turbulent regions highly perturbed by shocks and shear flows. We favour the non-thermal explanation, but the present data do not allow us to study the hard regions in detail and, in particular, to discriminate by spectral analysis between thermal and non-thermal emission.

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