On the origin of soft X-rays in obscured AGN: answers from high-resolution spectroscopy with XMM-Newton

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dc.creatorGuainazzi, Matteo
dc.creatorBianchi, Stefano
dc.date2006-10-24
dc.date.accessioned2026-07-07T10:23:59Z
dc.date.available2026-07-07T10:23:59Z
dc.descriptionWe 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 (AGN) observed with the Reflection Grating Spectrometer (RGS) on board 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: a) narrow Radiative Recombination Continua are detected in about 36% of the objects in our sample (in 26% their intrinsic width is <10 eV); b) 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 AGN 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 OVII He-alpha triplet (once normalized to the OVIII Ly-alpha) coupled with the integrated luminosity in He-like and H-like oxygen lines.
dc.description12 pages, 6 figures, Accepted for publication in MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0610715
dc.identifierhttp://arxiv.org/abs/astro-ph/0610715
dc.identifierMon.Not.Roy.Astron.Soc.374:1290-1302,2007
dc.identifierdoi:10.1111/j.1365-2966.2006.11229.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176032
dc.subjectAstrophysics
dc.titleOn the origin of soft X-rays in obscured AGN: answers from high-resolution spectroscopy with XMM-Newton
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