Please use this identifier to cite or link to this item: 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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