Extended X-ray emission in radio galaxies: the peculiar case of 3C 305

Abstract

Extended X-ray structures are common in Active Galactic Nuclei (AGNs). Here we present the first case of a Compact Steep Spectrum (CSS) radio galaxy, 3C 305, in which the X-ray radiation appears to be associated with the optical emission line region, dominated by the [O III]5007. On the basis of a morphological study, performed using the comparison between the X-rays, the optical and the radio band, we argue that the high energy emission has a thermal nature and it is not directly linked to the radio jet and hotspots of this source. Finally, we discuss the origin of the extended X-ray structure connected with the optical emission line region following two different interpretations: as due to the interaction between matter outflows and shock-heated environment gas, or as due to gas photoionized by nuclear emission.

5 pages, 2 figures, Accepted for publication in The ApJL Comments: references and affilitations corrected

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• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• X-ray Properties of the GigaHertz-Peaked and Compact Steep Spectrum Sources
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• Testing for Shock-Heated X-ray Gas Around Compact Steep Spectrum Radio Galaxies
• Peering Into the Extended X-ray Emission on Megaparsec Scale in 3C 187
• Powerful Radio Sources in the Southern Sky. II. A SWIFT X-Ray Perspective
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