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Issue A&A
Volume 453, Number 3, July III 2006
Page(s) 839 - 846
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20064956



A&A 453, 839-846 (2006)
DOI: 10.1051/0004-6361:20064956

4U 1344-60: a bright intermediate Seyfert galaxy at z = 0.012 with a relativistic Fe K $\mathsf{\alpha}$ emission line

E. Piconcelli1, 2, M. Sánchez-Portal2, M. Guainazzi2, A. Martocchia3, 4, C. Motch3, A. C. Schröder5, S. Bianchi2, E. Jiménez-Bailón6 and G. Matt6

1  Osservatorio Astronomico di Roma (INAF), via Frascati 33, 00040 Monteporzio Catone, Italy
    e-mail: piconcelli@mporzio.astro.it
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

(Received 2 February 2006 / Accepted 9 March 2006 )

Abstract
We present analysis of the optical and X-ray spectra of the low Galactic latitude bright ( $F_{\rm 2-10}$ = 3.6 $\times$ 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 $z = 0.012\pm0.001$ 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 ( $\Gamma\approx 1.55$) obscured by two neutral absorption components ( $N_{\rm H}^{f}$ ~ 1022 cm-2 and $N_{\rm H}^{p}$ ~ $4 \times 10^{22}$ 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 K$\alpha$ 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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