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

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 ∼ 40^o. 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.