XMM-Newton Observations of the Nuclei of the Radio Galaxies 3C 305, DA 240, and 4C 73.08

Abstract

We present new XMM-Newton EPIC observations of the nuclei of the nearby radio galaxies 3C 305, DA 240, and 4C 73.08, and investigate the origin of their nuclear X-ray emission. The nuclei of the three sources appear to have different relative contributions of accretion- and jet-related X-ray emission, as expected based on earlier work. The X-ray spectrum of the FRII narrow-line radio galaxy (NLRG) 4C 73.08 is modeled with the sum of a heavily absorbed power law that we interpret to be associated with a luminous accretion disk and circumnuclear obscuring structure, and an unabsorbed power law that originates in an unresolved jet. This behavior is consistent with other narrow-line radio galaxies. The X-ray emission of the low-excitation FRII radio galaxy DA 240 is best modeled as an unabsorbed power law that we associate with a parsec-scale jet, similar to other low-excitation sources that we have studied previously. However, the X-ray nucleus of the narrow-line radio galaxy 3C 305 shows no evidence for the heavily absorbed X-ray emission that has been found in other NLRGs. It is possible that the nuclear optical spectrum in 3C 305 is intrinsically weak-lined, with the strong emission arising from extended regions that indicate the presence of jet--environment interactions. Our observations of 3C 305 suggest that this source is more closely related to other weak-lined radio galaxies. This ambiguity could extend to other sources currently classified as NLRGs. We also present XMM-Newton and VLA observations of the hotspot of DA 240, arguing that this is another detection of X-ray synchrotron emission from a low-luminosity hotspot.

arXiv comment8 pages, 7 figures. Accepted for publication in ApJ

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Cited by in corpus (10)

• The subarcsecond mid-infrared view of local active galactic nuclei: II. The mid-infrared--X-ray correlation
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• The nature of the jet-driven outflow in the radio galaxy 3C305
• Extended X-ray emission in radio galaxies: the peculiar case of 3C 305
• The INTEGRAL/IBIS AGN catalogue: an update
• The column density distribution of hard X-ray radio galaxies
• The energetics of giant radio galaxy lobes from inverse Compton scattering observations
• Two types of shock in the hotspot of the giant quasar 4C74.26: a high-resolution comparison from Chandra, Gemini & MERLIN
• Suzaku measurement of electron and magnetic energy densities in the east lobe of the giant radio galaxy DA 240
• HST and Spitzer point source detection and optical extinction in powerful narrow-line radio galaxies