Astronomy & Astrophysics

Table 1: XMM-Newton observation Log. Columns: (1) observation identifier; (2) date of the observation; (3) duration of the observation [s]; (4)-(6) observing mode of MOS1, MOS2, and PN, respectively (FF: Full Frame; SW: Small Window); (7) Position with respect to the centre of the field of view.
Table 2: Results from the fit of the X-ray data. Columns: (1) model: power law (PL), power law with high-energy cutoff (COPL; cutoffpl model in xspec), multicolour black body disc (MCD; discbb model in xspec), Raymond-Smith (RAY), unsaturated Comptonization (CST; compst model in xspec); (2) absorption column [10²¹ cm^-2]; (3) free parameters of the model: (PL) photon index $\Gamma$ ; (COPL) photon index $\Gamma$ and cutoff energy $E_{{\rm cut}}$ [keV]; (MCD) temperature [keV] at the inner disc ( $T_{{\rm in}}$ ); (RAY) plasma temperature [keV] and metal abundances a; (CST) temperature [keV] and optical depth $\tau$ ; (4) $\chi ^2$ and degrees of freedom of the spectral fitting; the reduced $\chi ^2$ is reported between brackets; (5) flux in the 0.5-10 keV band (10^-11 erg cm^-2 s^-1); (6) X-ray luminosity in the 0.5-10 keV band (10³⁹ erg s^-1) calculated for d=795 kpc and corrected for the absorption. The Galactic column is $N_{\rm H} =5.6$ $\times$ 10²⁰ cm^-2. The uncertainties in the parameters are at the 90% confidence level.