Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aipc..313..110w&link_type=abstract
The Soft X-ray Cosmos, Proceedings of the ROSAT Science Symposium held College Park, MD, November 8-10, 1993. AIP Conference Pr
Physics
Radio Galaxies, X-Ray, X-Ray Sources, X-Ray Bursts
Scientific paper
One of ROSAT's major achievements has been its ability to separate X-ray emission components in many radio galaxies, where this was previously possible only for a very few well-known sources, e.g., M~87 and Cen~A. The dominant X-ray emission mechanism in radio galaxies as a class was unclear, with correlations between the X-ray and radio emissions used on one hand to argue for a nuclear origin for the X-rays, and on the other hand for a thermal origin. Now, with ROSAT we find the presence of both resolved (thermal) and unresolved emission to be typical. Our results are illustrated with PSPC data from the first six radio galaxies in our study. Spectral and spatial measurements independently support the presence of multiple emission components. The resolved emission can be modeled as thermal radiation from gas of galaxy, group, or cluster dimension depending on object. The unresolved emission may be thermal or non-thermal. Evidence is presented to support a non-thermal origin for most of the unresolved emission: for NGC~6251, where this component is dominant, gas-confinement properties argue against a thermal origin; for the sample as a whole, a proportionality between the unresolved X-ray and the radio-core luminosity densities supports the existence of non-thermal X-ray radiation from the inner regions of a parsec-scale radio jet. Our results have implications for the unification of BL Lac objects with low-power radio galaxies; part of the unresolved X-ray emission in the radio galaxies is probably unbeamed.
Birkinshaw Mark
Worrall Diana Mary
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