Heavy absorption and soft X-ray emission lines in the XMM-Newton spectrum of the Type 2 radio-loud quasar 3C 234 - AstrophysicsReport as inadecuate




Heavy absorption and soft X-ray emission lines in the XMM-Newton spectrum of the Type 2 radio-loud quasar 3C 234 - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We report results on a 40 ks XMM-Newton observation of the Type 2 quasar 3C234. Optical spectropolarimetric data have demonstrated the presence of ahidden broad-line region in this powerful M V <~ -24.2 after reddening andstarlight correction narrow-line FRII radio galaxy. Our analysis is aimed atinvestigating the X-ray spectral properties of this peculiar source which haveremained poorly known so far. We analyze the 0.5-10 keV spectroscopic datacollected by the EPIC cameras in 2006. The X-ray spectrum of this radio-loudquasar is typical of a local Compton-thin Seyfert 2 galaxy. It exhibits strongabsorption Nh~3.5 x 10^{23} cm^{-2} and a narrow, neutral Fe Kalpha emissionline with an equivalent width of ~140+-40 eV. Our observation also revealsthat the soft portion of the spectrum is characterized by strong emission lineswith a very low level of scattered primary continuum. A possible explanation ofthese features in terms of thermal emission from a two-temperaturecollisionally ionized plasma emission seems to be unlikely due to the highluminosity estimated for this component L0.5-2 ~ 6 x 10^{42} erg-s. It islikely that most of the soft X-ray emission originates from a photoionizedplasma as commonly observed in obscured, radio-quiet Seyfert-like AGNs. ThisX-ray observation has definitively confirmed the presence of a hidden quasar in3C 234. The line-rich spectrum and the steepness of the hard X-ray continuumGamma ~ 1.7 found in this source weaken the hypothesis that the bulk oftheX-ray emission in radio-loud AGNs with high excitation optical lines arisesfrom jet non-thermal emission.



Author: E. Piconcelli, S. Bianchi, G. Miniutti, F. Fiore, M. Guainazzi, E. Jimenez-Bailon, G. Matt

Source: https://arxiv.org/







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