Suzaku observation of the Phoenix galaxy

被引：12

作者：

Matt, G. ^{[1
]}

Bianchi, S. ^{[1
]}

Awaki, H. ^{[2
]}

Comastri, A. ^{[3
]}

Guainazzi, M. ^{[4
]}

Iwasawa, K. ^{[3
]}

Jimenez-Bailon, E. ^{[5
]}

Nicastro, F. ^{[6
]}

机构：

[1] Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy

[2] Ehime Univ, Dept Phys, Fac Sci, Matsuyama, Ehime 7908577, Japan

[3] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

[4] ESA, European Space Astron Ctr, Madrid 28080, Spain

[5] Univ Nacl Autonoma Mexico, Inst Astron, Ciudad De Mexico 04510, Mexico

[6] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Roma, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 496卷 / 03期

关键词：

galaxies: active; galaxies: Seyfert; galaxies:; individual:; Phoenix; X-rays:; galaxies; X-RAY-EMISSION; ACTIVE GALACTIC NUCLEI; SEYFERT; GALAXIES; K-ALPHA LINE; OBSCURED AGN; COMPTON SHOULDER; XMM-NEWTON; IRON; ABUNDANCES; SPECTRUM;

D O I：

10.1051/0004-6361/200811049

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. In recent years, several Seyfert 2 galaxies have been discovered 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 understanding the nature of the variations. Methods. The Suzaku spectrum was analyzed, and the results compared with previous ASCA and XMM-Newton observations. Results. The source was caught in a Compton-thin state, as in XMM-Newton, but differently from ASCA. Comparing the Suzaku and XMM-Newton observations, a variation in the column density of the absorber on a time scale of years is discovered. A similar change, but on much shorter time scales (i.e. ks) may also explain the count-rate variations during the Suzaku observations. A soft excess is also present, likely due to continuum and line emission from photoionized circumnuclear matter.

引用

页码：653 / 658

页数：6

共 25 条

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