XMM-NEWTON Detection of x-ray emission from the Compact Steep Spectrum Radio Galaxy 3C303.1

Christopher P. O'Dea, Rochester Institute of Technology
Bu Mu, Rochester Institute of Technology
Diana M. Worral, H.H. Willis Physics Laboratory
Joel Kastner, Rochester Institute of Technology
Stefi A. Baum, Rochester Institute of Technology
Willem H. de Vries, Lawrence Livermore National Laboratory

This is the pre-print of an article published by the American Astronomical Society. The final, published version is available here: https://doi.org/10.1086/508705

© 2006 The American Astronomical Society

Also archived in: arXiv:astro-ph/0608320 v1 Aug 15 2006

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.


Using XMM we detect faint unresolved X-ray emission from the Compact Steep Spectrum radio galaxy 3C 303.1. We detect a thermal component at kT ≃ 0.8 keV which seems likely to be produced in the ISM of the host galaxy. There is evidence for a second component in the spectrum whose nature is currently ambiguous. Plausible hypotheses for the second component include (1) hot gas shocked by the expansion of the radio source, and (2) Synchrotron self- Compton emission from the southern radio lobe if the magnetic field is below the equipartition value by a factor of ∼ 3.5.