... survey

Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.

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...

The catalogue and full Tables D.1 and D.2 are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/493/339

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... observations

An observation is defined as a single science pointing at a fixed celestial target which may consist of several exposures with the XMM-Newton instruments.

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... ODF

The Observation Data File is a collection of standard FITS format raw data files created from the satellite telemetry.

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... blocking

See Appendix A.

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... PSF

See Appendix A.  

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... (SAS

The description and documentation are available on-line at the ESAC web site http://xmm2.esac.esa.int/sas/

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... files

As available on 2006 July 02 plus three additional calibration files for MOS2 and RGS1.

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... GTIs

see Appendix A.

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... patterns

See Appendix A.

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... PSF

See Appendix A.

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... on-axis

The encircled energy fraction does not strongly depend on off-axis angle.

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...$L = -\ln(P)$

Protassov et al. (2002) have highlighted the dangers of using the probabilities derived from likelihood ratio tests when the null hypothesis is close to the boundary of parameter space. In this regard it is clear that it is inappropriate to interpret the detection likelihoods, L, literally in terms of detection probabilities. Instead the relation between the likelihood and the detection probability requires calibration via simulations, as is discussed in Sect. 9.4.

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...$\sigma_{\rm sys}$

In the catalogue and associated documentation we refer to this as a ``systematic'' error. This nomenclature is somewhat misleading as the true nature of this component of the positional errors is far from clear. 

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... ECFs

EPIC RMFs are available at http://xmm.vilspa.esa.es/external/xmm_sw_cal/calib/epic_files.shtml

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... events

Single-only events = pattern 0, single-plus-double events = patterns 1-4.

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... counts

Where the source was only observed with one or two cameras the equivalent EPIC counts were calculated for the absent camera(s) using the pn to MOS count ratio 3.5:1, representative of the typical source count ratios.

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... ``canned''

Pre-computed for the instrument, mode, event pattern selection and approximate detector location of the source.

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... Simbad

The SIMBAD astronomical database (Wenger et al. 2000).

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... NED

The NASA/IPAC extragalactic database.

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... Vizier

The VizieR Service at CDS (Ochsenbein et al. 2000).

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... spurious

Spurious detections caused by the background noise (as characterised by their likelihood) are not discussed in this section, see Sects. 4.4 and 9.4.

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... Flag 12

Note that Flag 12 was not set when the source appeared to be split into two, cf. Sect. 4.4.4, or when a close-by fainter detection appeared to be of comparable brightness.

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... and c)

Figure 8 also does not take into account the effects of Poisson noise which produces a probability distribution for source detectability about the sensitivity limit. These effects are only important at the low count limit, i.e. essentially only at faint fluxes, cf. Georgakakis et al. (2008).

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... objects

We also note that this is what is expected from the source counts of clusters of galaxies which are expected to dominate the extended detections, at least at high Galactic latitudes.

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... (XSA

http://xmm.esac.esa.int/xsa/

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... LEDAS

http://www.ledas.ac.uk/xmm/2xmmlink.html

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... AstroGrid

http://www.astrogrid.org

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... Strasbourg

http://amwdb.u-strasbg.fr/2xmm/home

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...calibration

http://xmm2.esac.esa.int/external/xmm_sw_cal/calib/documentation/index.shtml

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... coordinates

Note that Simbad frequently up-dates its information and the coordinates given here may be out of date.

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... DSS

The STScI Digitized Sky Survey.

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... task

The documentation on SAS tasks are available through the public XMM-SAS distribution from the ESAC web pages.

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... on-axis

This is the optical axis which is close to but not the same as the geometrical centre of the detector.

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