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- W2109032570 abstract "We present results of a high-resolution soft X-ray (0.2–2 keV) spectroscopic study of a sample of 69 nearby obscured active galactic nuclei (AGNs) observed with the reflection grating spectrometer (RGS) onboard XMM–Newton. This is the largest sample ever studied with this technique so far. The main conclusions of our study can be summarized as follows: (i) narrow radiative recombination continua are detected in about 36 per cent of the objects in our sample (in 26 per cent their intrinsic width is ≤10 eV); (ii) higher order transitions are generally enhanced with respect to pure photoionization, indicating that resonant scattering plays an important role in the ionization/excitation balance. These results support the scenario, whereby the active nucleus is responsible for the X-ray ‘soft excess’ almost ubiquitously observed in nearby obscured AGNs via photoionization of circumnuclear gas. They confirm on a statistical basis the conclusions drawn from the detailed study of the brightest spectra in the sample. Furthermore, we propose a criterion to statistically discriminate between AGN-photoionized sources and starburst galaxies, based on intensity of the forbidden component of the O vii Heα triplet (once normalized to the O viii Lyα) coupled with the integrated luminosity in He- and H-like oxygen lines." @default.
- W2109032570 created "2016-06-24" @default.
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- W2109032570 date "2007-02-01" @default.
- W2109032570 modified "2023-10-18" @default.
- W2109032570 title "On the origin of soft X-rays in obscured AGN: answers from high-resolution spectroscopy with XMM-Newton" @default.
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- W2109032570 doi "https://doi.org/10.1111/j.1365-2966.2006.11229.x" @default.
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