Mutiwavelength Observations of Radio Galaxy 3C 120 with XMM-Newton

Abstract

We present XMM-Newton observations of the radio galaxy 3C 120. The hard X-ray spectrum contains a marginally resolved Fe I K-alpha emission line with FWHM=9,000 km/s and an equivalent width of 57 eV. The line arises via fluorescence in a broad-line region with covering fraction of 0.4. There is no evidence of relativistically broad Fe K-alpha, contrary to some previous reports. The normal equivalent widths of the X-ray and optical emission lines exclude a strongly beamed synchrotron component to the hard X-ray and optical continua. There is an excess of 0.3-2 keV soft X-ray continuum over an extrapolation of the hard X-ray power-law, which may arise in a disk corona. Analysis of an archival Chandra image shows that extended emission from the jet and other sources contributes <3% of the total X-ray flux. A break in the X-ray spectrum below 0.6 keV indicates an excess neutral hydrogen column density of N_H=1.57 * 10^21 cm^{-2}. However, the neutral absorber must have an oxygen abundance of <1/50 of the solar value to explain the absence of an intrinsic or intervening O I edge. There is no ionized absorption in the soft X-ray spectrum, but there is a weak, narrow O VIII Ly-alpha emission line. We do not detect previously claimed O VIII absorption from the intervening intergalactic medium. Radio observations at 37 GHz show a fast, high frequency flare starting 8 days after the XMM-Newton observation. However, this has no obvious effect on the X-ray spectrum. The X-ray spectrum, including the soft excess, became harder as the X-ray flux decreased, with an estimated pivot energy of 40 keV. The UV and soft X-ray fluxes are strongly correlated over the 120 ks duration of the XMM-Newton observation. This is qualitatively consistent with Comptonization of UV photons by a hot corona. (Abridged)

23 pages, 13 figures, Submitted to the Astrophysical Journal April 2004

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Cited by in corpus (26)

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• Core shifts, magnetic fields and magnetization of extragalactic jets
• Broad Line Radio Galaxies Observed with Fermi-LAT: The Origin of the GeV Gamma-Ray Emission
• Probing the Disk-jet Connection of the Radio Galaxy 3C120 Observed with Suzaku
• Structure of the Accretion Flow in Broad-Line Radio Galaxies: The Case of 3C390.3
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• Warm Absorber Energetics in Broad Line Radio Galaxies
• The remarkable X-ray spectrum of the Broad-Line Radio Galaxy 3C 445
• The Accretion Geometry in Radio-Loud Active Galaxies
• NuSTAR hard X-ray spectra of radio galaxies
• Radio/X-ray monitoring of the broad-line radio galaxy 3C 382. High-energy view with XMM-Newton and NuSTAR
• Multi-wavelength Variability of the Broad Line Radio Galaxy 3C 120
• The nature of a broad line radio galaxy: Simultaneous RXTE and Chandra HETG observations of 3C 382
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• The Composition and Power of the Jet of the Broad-Line Radio Galaxy 3C 120
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