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|Title:||An elusive X-ray iron absorption line in a candidate recoiling supermassive black hole||Authors:||MARCHESI, STEFANO
Civano, F. M.
Hickox, R. C.
|Issue Date:||2014||Number:||223||First Page:||150.10||Abstract:||We studied a peculiar X-ray source detected in the Chandra-COSMOS survey at z=0.359. CID-42 is the only source in the survey which clearly shows two optical sources (in the HST/ACS image) embedded in the same galaxy. Civano et al. 2010 and 2012 showed that one source is a bright active galactic nucleus (AGN) recoiling from the center of the galaxy, while the other is most likely a star-forming region in the center of the galaxy. CID-42 was imaged in the X-rays using both XMM-Newton and Chandra satellites. The X-ray spectra show a rare Kalpha line inverted P-Cygni profile, i.e. a redshifted absorption component and an emission component. Redshifted absorption lines are usually explained as high velocity inflows of ionized material very close to the active black hole. CID-42 absorption feature showed a considerable variability in the line energy peak, implying rapid changes of velocity and ionization state of the infalling material. We present the results of a new XMM-Newton single long (130 ks) observation obtained to perform an accurate modeling of the absorption line. The results show that the highly significant (3 sigma) absorption feature observed between 2003 and 2007 with XMM and Chandra is not present in the new observation. We performed a detailed statistical analysis to understand if this result is due to a physical change in the absorber rather than to an instrumental effect. We also studied the connection between the presence of high velocity inflows and recoiling supermassive black hole.||URI:||http://hdl.handle.net/20.500.12386/12155||Bibcode ADS:||2014AAS...22315010M|
|Appears in Collections:||3.02 Abstract in Atti di convegno|
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