A multi-wavelength study of nuclear activity and environment of low-power radio galaxy CTD 86

作者：Pandge M B^*; Dewangan G C; Singh K P; Patil M K

来源：Monthly Notices of the Royal Astronomical Society, 2013, 435(4): 3385-3394.

DOI：10.1093/mnras/stt1531

• galaxies: active
• galaxies: elliptical and lenticular, cD
• galaxies: individual: CTD 86
• galaxies: nuclei
• X-rays: galaxies
• X-rays: individual: RX J1424.7+2636

We present an X-ray study of the nuclear and extended emission of a nearby Fanaroff %26 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 similar to 0.79 keV, n(e) similar to 10(-3) cm(-3), L-X similar to 5 x 10(42) erg s(- 1) extended over similar to 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 similar to 5.9 x 10(22) cm(-2)) power law (Gamma similar to 1.5) with 2-10 keV luminosity L-X similar to 2.1 x 10(42) erg s(-1). We have measured the stellar velocity dispersion, Sigma = 182 +/- 8 km s(-1), for the CTD 86 and estimated a mass M-BH similar to 9 x 10(7) M-circle dot with L-bol/L-Edd similar to 4 x 10(-3). The low L-bol/L-Edd rate and high L-X/L-[O 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 similar to 40 degrees-50 degrees) 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 similar to 8 x 10(43) erg s(-1), while SDSS J142443.78+263616.2 is probably a galaxy with an active nucleus.

• 出版日期2013-11