The ROSAT WGACAT catalogue of point sources

The WGACAT catalogue has been generated using the ROSAT PSPC pointed data publicly available as of September 1994. It contains more than 45600 individual sources in a total of 2624 fields [66]. 13937 sources are located within the FBS area; we have cross-correlated this list with the FBS. There are 53 X-ray sources within 2$^\prime$ of a FBS object, while we expect 13 chance coincidences. 28 of them are also listed in the RASS catalogue. We have measured accurate optical positions for the 25 remaining objects (Table 1) and recomputed the separation with the companion X-ray sources. There are 13 FBS objects within 30$^{\prime\prime}$ from an X-ray source (excluding the sources appearing in the RASS catalogue). Seven are QSOs, four are stars (including 3 CVs) and only two (listed in Table 2) were of unknown nature before our spectroscopic observations.

 

$$b\:\: \:\:z$$ FBS name Mag O (1) (2)

0732+396 16.0 14.70 X 10 20 N 25.1 QSO 0.118

0950+664 16.7 17.00 X 15 16 Y 42.4 AGN

1112+668 17.0 16.53 X 10  4 Y 47.9 QSO 0.544

1150+334 16.2 16.30 R  0.8  1.2 Y 76.0 QSO 1.40

1235+699 17.9 17.96 x  5  4 Y 47.4 QSO 0.522 ?

1255+447 16.5 16.48 X 10 13 Y 72.6 QSO 0.300

1315+447 17.0 17.33 x  5 15 Y 71.9 DZ:

1324+448 17.0 18.09 X  8  9 Y 71.1 QSO 0.331 ?

1500+752 16.9 -- X 10 11 N 39.5 DA:

1822+352 15.8 -- R  3.5  3.9 N 20.5 DA

2308+425 13.5 -- X 12  8 N -16.3

X: in the ROSAT All Sky Survey Bright Source Catalogue; x: in the ROSAT WGACAT Catalogue; R: in the NRAO VLA Sky Survey; Y: in the PG area; N: not in the PG area; O: APS O magnitudes; (1): error of the ROSAT or VLA position (in arcsec); (2): distance between the FBS and ROSAT or VLA positions (in arcsec).