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http://hdl.handle.net/2307/286
Title: | Suzaku observation of the Phoenix galaxy | Authors: | Matt, Giorgio Bianchi, Stefano Awaki, Hisamitsu Comastri, Andrea Guainazzi, Matteo Iwasawa, Kazushi Jimenez-Bailon, Elena Nicastro, Fabrizio |
Keywords: | X-RAY-EMISSION ACTIVE GALACTIC NUCLEI SEYFERT 2 GALAXIES K-ALPHA LINE OBSCURED AGN COMPTON SHOULDER XMM-NEWTON IRON ABUNDANCES SPECTRUM |
Issue Date: | Mar-2009 | Publisher: | EDP Sciences | Abstract: | Context. In recent years, several Seyfert 2 galaxies have beendiscovered that change state when observed in X-rays a few years apart,switching from Compton-thin to reflection-dominated or viceversa.Aims. We observed a member of this class of "Changing-look" sources,the Phoenix galaxy, with Suzaku, with the aim of better understandingthe nature of the variations.Methods. The Suzaku spectrum was analyzed, and the results comparedwith previous ASCA and XMM-Newton observations.Results. The source was caught in a Compton-thin state, as inXMM-Newton, but differently from ASCA. Comparing the Suzaku andXMM-Newton observations, a variation in the column density of theabsorber on a time scale of years is discovered. A similar change, buton much shorter time scales (i.e. ks) may also explain the count-ratevariations during the Suzaku observations. A soft excess is alsopresent, likely due to continuum and line emission from photoionizedcircumnuclear matter. | URI: | http://hdl.handle.net/2307/286 | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/200811049 |
Appears in Collections: | A - Articolo su rivista X_Dipartimento di Fisica 'Edoardo Amaldi' |
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File | Description | Size | Format | |
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suzakuobservationsphoenix.pdf | 173.47 kB | Adobe PDF | View/Open |
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