Volume 453, Number 3, July III 2006
|Page(s)||839 - 846|
|Published online||28 June 2006|
4U 1344-60: a bright intermediate Seyfert galaxy at z = 0.012 with a relativistic Fe K emission line
Osservatorio Astronomico di Roma (INAF), via Frascati 33, 00040 Monteporzio Catone, Italy e-mail: firstname.lastname@example.org
2 European Space Astronomy Center (ESA), Apartado 50727, 28080 Madrid, Spain
3 Observatoire Astronomique de Strasbourg, rue de l'Université 11, 67000 Strasbourg, France
4 Centre d'Étude Spatiale des Rayonnements, Avenue du Colonel Roche, BP 4346, 31028 Toulouse, France
5 Department of Physics & Astronomy (University of Leicester), University Road, Leicester LE1 7RH, UK
6 Dipartimento di Fisica (Università degli Studi Roma Tre), via della Vasca Navale 84, 00146 Roma, Italy
Accepted: 9 March 2006
We present analysis of the optical and X-ray spectra of the low Galactic latitude bright (F2-10 = 3.6 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 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 () obscured by two neutral absorption components ( ~ 1022 cm-2 and ~ cm-2), the latter covering only the ~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 Kα line at ~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 ~4.9 and ~5.2 keV.
Key words: galaxies: active / galaxies: individual: 4U 1344-60 / X-ray: galaxies
© ESO, 2006
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