ALBERT

Description: We present an X-ray study of the nuclear and extended emission of a nearby Fanaroff & Riley class I (FR-I) radio galaxy CTD 86 based on the XMM–Newton observations. Two different components observed are: diffuse thermal emission from hot gas ( kT  ~ 0.79 keV, n e  ~ 10 –3 cm –3 , L X ~ 5 x 10 42 erg s – 1 extended over ~186 kpc), and unresolved nuclear emission exhibiting mild activity. The hot gaseous environment of CTD 86 is similar to that found in groups of galaxies or in bright early-type galaxies. No clear signatures of radio-lobe interaction with the diffuse hot gas are evident in this case. X-ray emission from the nucleus is well constrained by an intrinsically absorbed ( N H  ~ 5.9 10 22 cm –2 ) power law ( ~ 1.5) with 2–10 keV luminosity L X  ~ 2.1 10 42 erg s –1 . We have measured the stellar velocity dispersion,  = 182 ± 8 km s –1 , for the CTD 86 and estimated a mass M BH  ~ 9 10 7 M with L bol / L Edd  ~ 4 10 –3 . The low L bol / L Edd rate and high $L_{\rm X}/L_{\rm [O\,{\small {III}}]}$ ratio suggest that the central engine of CTD 86 consists of a truncated accretion disc lacking a strong ionizing ultraviolet radiation and an inner hot flow producing the X-ray emission. The truncated disc is likely to be inclined with ( i  ~ 40°–50°) such that our line of sight passes through the outer regions of a putative torus and thus results in high X-ray absorption. We have also identified two bright X-ray sources: SDSS J142452.11+263715.1 and SDSS J142443.78+263616.2, near CTD 86. SDSS J142452.11+263715.1 is a type 1 active galactic nucleus at z  = 0.3761 and unabsorbed 0.3–10 keV X-ray luminosity L X  ~ 8 10 43 erg s –1 , while SDSS J142443.78+263616.2 is probably a galaxy with an active nucleus.