...AGNs

Based on observations collected at the European Southern Observatory, La Silla, Chile and on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).

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...

Appendix A and B are only available in electronic form at http://www.edpsciences.org

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... (SSC)

The XMM-Newton SSC is an international collaboration appointed by ESA to help the SOC in developing the SAS, to pipe-line process all XMM data and to exploit the XMM-Newton serendipitous detections. See http://xmmssc-www.star.le.ac.uk/ for a description of the SSC activities.

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... catalogue

http://www.ast.cam.ac.uk/~apmcat/

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... accuracy

see the "EPIC status of calibration and data analysis'' report, at xmm.vilspa.esa.es/

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... model

This model consists of two power-laws, one absorbed and one unabsorbed, having the same photon index.

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... flux

$F_{\rm opt}=\Delta\lambda\times f_{6400~\rm\AA}$ where $f_{6400~\rm\AA}$ is the monochromatic flux at 6400 Å derived from the APM red magnitudes and $\Delta\lambda$ is the band width of the R Cousins filter.

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... ratio

The value $F_{\rm {[OIII]}}$ should be corrected for the reddening based on the Balmer decrement as explained in Bassani et al. (1999). In XBS J031146.1-550702, however, the estimate of the Balmer decrement is difficult due to the presence of the broad H$\alpha$ component and the relatively poor S/N ratio of the available spectrum. We attempted a de-blending of the two components in the H$\alpha$ profile and we have obtained H$\alpha$/H $\beta\sim2$-3 which indicates that the reddening should not be very important. For this reason we have not applied any reddening correction.

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