The iron emission line complex of MCG-5-23-16: the long XMMNewton look

V. Braito (1) , J. N. Reeves (1) , G. Dewangan (2) , I. George (1) , R. Griffiths (2) , A. Markowitz (1) , K. Nandra (3) , D. Porquet (4) , A. Ptak (1) , T. J. Turner (1) , T. Yaqoob (1) , K. Weaver (1)

1 GSFC - NASA Goddard Space Flight Center
2 CMU - Carnegie Mellon University [Pittsburgh]
3 Imperial College London
4 MPE - Max Planck Institute for Extraterrestrial Physics

We present the results of the simultaneous XMM-Newton and Chandra observations of the bright Seyfert 1.9 galaxy MCG-5-23-16, which is one of the best known examples of a relativistically broadened iron K\alpha line. We find that: a) the soft X-ray emission is likely to be dominated by photoionized gas, b) the complex iron emission line is best modelled with a narrow and a broad component with a FWHM ˜ 44000 km/s. This latter component has an EW˜ 50 eV and its profile is well described with an emission line mainly originating from the accretion disk a few tens of gravitational radii from the central black hole and viewed with an inclination angle ˜ 40o. We found evidence of a possible sporadic absorption line at ˜ 7.7 keV which, if associated with Fe XXVI K\alpha resonance absorption, is indicative of a possible high velocity (v˜ 0.1 c) outflow.

Mots clés: galaxies: active; galaxies: individual (MCG-5-23-16); galaxies: Seyfert; X-rays: galaxies

Domaines: Planète et Univers [physics]; Astrophysique [astro-ph]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Phénomènes cosmiques de haute energie [astro-ph.HE]

V. Braito, J. N. Reeves, G. Dewangan, I. George, R. Griffiths, et al.. The iron emission line complex of MCG-5-23-16: the long XMMNewton look. Astronomical Notes / Astronomische Nachrichten, 2006, 327 (10), pp.1067-1070. ⟨10.1002/asna.200610694⟩. ⟨hal-02337858⟩