Multi-wavelength study of the Seyfert 1 galaxy NGC 3783 with XMM-Newton

Abstract

We present the analysis of multi-wavelength XMM-Newton data from the Seyfert galaxy NGC 3783, including UV imaging, X-ray and UV lightcurves, the 0.2-10 keV X-ray continuum, the iron K-alpha emission line, and high-resolution spectroscopy and modelling of the soft X-ray warm absorber. The 0.2-10 keV spectral continuum can be well reproduced by a power-law at higher energies; we detect a prominent Fe K-alpha emission line, with both broad and narrow components, and a weaker emission line at 6.9 keV which is probably a combination of Fe K-beta and Fe XXVI. We interpret the significant deficit of counts in the soft X-ray region as being due to absorption by ionised gas in the line of sight. This is demonstrated by the large number of narrow absorption lines in the RGS spectrum from iron, oxygen, nitrogen, carbon, neon, argon, magnesium, silicon and sulphur. The wide range of iron states present in the spectrum enables us to deduce the ionisation structure of the absorbing medium. We find that our spectrum contains evidence of absorption by at least two phases of gas: a hotter phase containing plasma with a log ionisation parameter xi (where xi is in erg cm/s) of 2.4 and greater, and a cooler phase with log xi centred around 0.3. The gas in both phases is outflowing at speeds of around 800 km/s. The main spectral signature of the cold phase is the Unresolved Transition Array (UTA) of M-shell iron, which is the deepest yet observed; its depth requires either that the abundance of iron, in the cold phase, is several times that of oxygen, with respect to solar abundances, or that the absorption lines associated with this phase are highly saturated. The cold phase is associated with ionisation states that would also absorb in the UV.

16 pages, 10 figures, accepted by Astronomy & Astrophysics; some measured wavelengths and blueshifts changed to correct a computing error

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• The XMM-Newton Optical/UV Monitor Telescope
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• Complex resonance absorption structure in the X-ray spectrum of IRAS13349+2438
• High-Resolution X-ray Spectroscopy and Modeling of the Absorbing and Emitting Outflow in NGC 3783
• Soft X-Ray Absorption by Fe${}^{0+}$ to Fe${}^{15+}$ in Active Galactic Nuclei
• Soft X-ray emission lines from a relativistic accretion disk in MCG -6-30-15 and Mrk 766
• Inner-shell 1s - 2p Soft X-ray Absorption Lines
• On the Column Density of AGN Outflows: the Case of NGC 5548
• The BeppoSAX broad-band spectrum and variability of the Seyfert 1 NGC 3783

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