EDP Sciences
Free Access
Volume 410, Number 2, November I 2003
Page(s) 471 - 479
Section Galactic structure and dynamics
DOI https://doi.org/10.1051/0004-6361:20031124

A&A 410, 471-479 (2003)
DOI: 10.1051/0004-6361:20031124

The complex FeK line of the Narrow-Line Seyfert 1 galaxy IRAS 13349+2438

A. L. Longinotti1, 2, M. Cappi2, K. Nandra1, M. Dadina2 and S. Pellegrini3

1  Astrophysics Group, Imperial College of Science, Technology and Medicine, Prince Consort Rd. SW7 2AZ, London, UK
2  Istituto IASF-CNR, Sezione di Bologna Via Gobetti 101, 40129 Bologna, Italy
3  Universita' degli studi di Bologna, Dipartimento di Astronomia, via Ranzani 1, 40127 Bologna, Italy

(Received 7 April 2003 / Accepted 24 July 2003)

The observation of the Narrow-Line Seyfert 1 galaxy IRAS 13349+2438 performed by XMM-Newton European Photon Imaging Camera between 0.3-10 keV, is presented here. The broadband spectrum of the source is dominated at low energies ( $E \leq2$ keV) by a strong excess of emission and by complex emission/absorption features between ~5.5-8.0 keV. The soft X-ray spectrum is consistent with ionized absorption found by the Reflection Grating Spectrometer (Sako et al. 2001a). We focus on the 2-10 keV spectrum which shows clear evidence for a broad, complex FeK $\alpha$ line, previously unseen by ASCA, and for an Fe K-shell edge detected at ~7.3-7.4 keV (rest-frame). The presence of this edge could be explained by either partial covering or ionized/relativistic reflection models, with the latter being preferred and with a resulting power law slope of $\Gamma \sim 2.2$. The line profile is complex, with a broad bump between ~5.5-6.5 keV and a narrow emission line at ~7 keV, separated by a sharp drop at ~6.8 keV. This profile is compatible with two possible scenarios: i) a broad, ionized and gravitationally redshifted Laor diskline plus a narrow and ionized emission line; ii) a broad, ionized and single Schwarzschild (double-peaked) diskline with a superimposed narrow absorption line.

Key words: X-rays: galaxies -- galaxies: Seyfert -- galaxies: individual: IRAS 13349+2438

Offprint request: A. L. Longinotti, all@imperial.ac.uk

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