4U 1344-60:: a bright intermediate Seyfert galaxy at z=0.012 with a relativistic FeKα emission line

被引:18
作者
Piconcelli, E.
Sanchez-Portal, M.
Guainazzi, M.
Martocchia, A.
Motch, C.
Schroder, A. C.
Bianchi, S.
Jimeez-Bailon, E.
Matt, G.
机构
[1] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy
[2] European Space Agcy, European Space Astron Ctr, E-28080 Madrid, Spain
[3] Observ Astron, F-67000 Strasbourg, France
[4] Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France
[5] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[6] Univ Studi Roma Tre, Dipartimento Fis, I-00146 Rome, Italy
关键词
galaxies : active; galaxies : individual : 4U 1344-60; X-ray : galaxies;
D O I
10.1051/0004-6361:20064956
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present analysis of the optical and X-ray spectra of the low Galactic latitude bright (F2-10 = 3.6 x 10(-11) erg cm(-2) s(-1)) source 4U 1344-60. On the basis of the optical data we propose to classify 4U 1344-60 as an intermediate type Seyfert galaxy and we measure a value of z = 0.012 +/- 0.001 for its redshift. From the XMM-Newton observation we find that the overall X-ray spectral shape of 4U 1344-60 is complex and can be described by a power-law continuum (Gamma approximate to 1.55) obscured by two neutral absorption components (N-H(f) similar to 10(22) cm(-2) and NpH similar to 4 x 10(22) cm(-2)), the latter covering only the similar to 50% of the primary X-ray source. The X-ray data therefore lend support to our classification of 4U 1344-60. It exhibits a broad and skewed Fe K alpha line at similar to 6.4 keV, which suggests the existence of an accretion disk that is able to reprocess the primary continuum down to a few gravitational radii. Such a line represents one of the clearest examples of a relativistic line observed by XMM-Newton so far. Our analysis has also revealed the marginal presence of two narrow line-like emission features at similar to 4.9 and similar to 5.2 keV.
引用
收藏
页码:839 / 846
页数:8
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