Extended soft X-ray emission in 3CR radio galaxies at z < 0.3: High Excitation and Broad Line Galaxies

Abstract

We analyze Chandra observations of diffuse soft X-ray emission associated with a complete sample of 3CR radio galaxies at z < 0.3. In this paper we focus on the properties of the spectroscopic sub-classes of high excitation galaxies (HEGs) and broad line objects (BLOs). Among the 33 HEGs we detect extended (or possibly extended) emission in about 40% of the sources; the fraction is even higher (8/10) restricting the analysis to the objects with exposure times larger than 10 ks. In the 18 BLOs, extended emission is seen only in 2 objects; this lower detection rate can be ascribed to the presence of their bright X-ray nuclei that easily outshine any genuine diffuse emission. A very close correspondence between the soft X-ray and optical line morphology emerges. We also find that the ratio between [O III] and extended soft X-ray luminosity is confined within a factor of 2 around a median value of 5. Both results are similar to what is seen in Seyfert galaxies. We discuss different processes that could explain the soft X-ray emission and conclude that the photoionization of extended gas, coincident with the narrow line region, is the favored mechanism.

15 pages, 11 figures. Accepted for publication on A&A

References in corpus (15)

• CAIXA: a Catalogue of AGN In the XMM-Newton Archive I. Spectral analysis
• On the origin of soft X-rays in obscured AGN: answers from high-resolution spectroscopy with XMM-Newton
• An optical spectroscopic survey of the 3CR sample of radio galaxies with z<0.3. I. Presentation of the data
• Hubble Space Telescope Near-Infrared Snapshot Survey of 3CR radio source counterparts at low redshift
• The nature of the jet-driven outflow in the radio galaxy 3C305
• WFPC2 LRF Imaging of Emission Line Nebulae in 3CR Radio Galaxies
• A Radio Through X-ray Study of the Jet/Companion-Galaxy Interaction in 3C 321
• The Chandra, HST, and VLA View of the Circumnuclear Extended Emission in the Narrow Emission Line Galaxy NGC 2110
• Extended X-ray emission in radio galaxies: the peculiar case of 3C 305
• HST/ACS Emission Line Imaging of Low Redshift 3CR Radio Galaxies I: The Data
• Extended emission-line regions in low-redshift quasars: Dependence on nuclear spectral properties
• The remarkable X-ray spectrum of the Broad-Line Radio Galaxy 3C 445
• 3C 33: another case of photoionized soft X-ray emission in radio galaxies
• XMM-Newton unveils the type 2 nature of the BLRG 3C 445
• Heavy absorption and soft X-ray emission lines in the XMM-Newton spectrum of the Type 2 radio-loud quasar 3C 234

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