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

Abstract

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{} observations. Two different components observed are : diffuse thermal emission from hot gas ($kT\sim 0.79\kev$, $n_e\sim 10^{-3}\mathrm{c}{\mathrm{m}}^{-3}$, $L_X\sim 5\times 10^{42}\mathrm{erg}{\mathrm{s}}^{-1}$ extended over $\sim 186\mathrm{kpc}$), 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 is evident in this case. X-ray emission from the nucleus is well constrained by an intrinsically absorbed ($N_H\sim 5.9\times 10^{22}\mathrm{c}{\mathrm{m}}^{-2}$) power law ($\Gamma \sim 1.5$) with $2-10\kev$ luminosity $L_X\sim 2.1\times 10^{42}\mathrm{erg}{\mathrm{s}}^{-1}$. We have measured the stellar velocity dispersion, $σ=182\pm8\kms$, for the CTD 86 and estimated a mass $M_{BH}\sim 9\times 10^7{\mathrm{M}}_{\odot }$ with $L_{bol}/L_{Edd}\sim 4\times 10^{-3}$. The low $L_{bol}/L_{Edd}$ rate and high $L_X/L_{[OIII]}$ ratio suggest that the central engine of CTD 86 consists of a truncated accretion disk lacking a strong ionizing UV radiation and an inner hot flow producing the X-ray emission. The truncated disk is likely to be inclined with ($i\sim 40^{\circ }-50^{\circ }$) 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 $L_X\sim 8\times 10^{43}\mathrm{erg}{\mathrm{s}}^{-1}$, while SDSS J142443.78+263616.2 is probably a galaxy with an active nucleus.

19 pages, 3 Tables, 9 figures, Accepted for publication in MNRAS

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Cited by in corpus (1)

• Optical Imaging & Spectral Study of FR-I Type Radio Galaxy:CTD 086 (B2 1422+26B)