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D.E. Harris, M. Vestergaard (SAO), J. Hjorth (U. Copenhagen), A.C. Sadun (U. Colorado at Denver), J.D. Silverman (U. Virginia)
We report the discovery of X-ray emission from a radio knot at a projected distance of 25'' from the nucleus of the Seyfert galaxy, 3C 120. The data were obtained with the ROSAT High Resolution Imager (HRI). Optical upper limits for the knot preclude a simple power law extension of the radio spectrum and we calculate some of the physical parameters for thermal bremsstrahlung and synchrotron self Compton models. We conclude that no simple model is consistent with the data and suggest the existence of one or more small, non-thermal sources with flat spectra. The energy requirements for these would be modest and the features would not be discernable in previous radio maps.
The author(s) of this abstract have provided an email address for comments about the abstract: harris@cfa.harvard.edu