All Tables

Table 1: Statistics of the HQS type of 3212 optical associations with 2982 ROSAT FSC sources.
Table 5: Number and percentage of radio quiet and radio loud X-ray detected QSOs in the Véron-Cetty & Véron catalogue. Columns 1 and 2: $O_{\rm USNO}$ range, Col. 3: number of QSOs, Col. 4: number of sources brighter than 0.02 count s^-1 in the ROSAT catalogues, Col. 5: percentage of ROSAT detected QSOs; Col. 6 to 8: the same for the radio loud QSOs.
Table 2: List of the 185 galaxy candidates. Column 1: right ascension, Col. 2: declination, Col. 3: separation between the ROSAT and USNO positions in arcsec, Col. 4: X-ray count rate (count s^-1), Col. 5: logarithm of the 0.1-2.4 keV X-ray luminosity (in erg s^-1), Col. 6: magnitude $O_{\rm USNO}$ , Col. 7: magnitude $O_{\rm APS}$ , Col. 8: redshift, Col. 9: classification (abs: galaxies with absorption lines only; em: emission line galaxies, but too weak to make a classification possible; C stands for Composite spectrum; S or S?: the object is certainly an AGN, but the lines are too weak for a more precise classification); Col. 10: references: (1) BAO; (2) OHP, Col. 11: name.
Table 3: List of the 76 known AGN brighter than $O_{\rm USNO}=16.5$ , located within 35 $\hbox {$^{\prime \prime }$ }$ of a ROSAT-FSC source. Column 1: right ascension, Col. 2: declination, Col. 3: separation between the ROSAT and USNO positions in arcsec, Col. 4: X-ray count rate (count s^-1), Col. 5: magnitude $O_{\rm USNO}$ , Col. 6: magnitude $O_{\rm APS}$ , Col. 7: APS O-E colour, Col. 8: redshift, Col. 9: absolute magnitude computed by using the $O_{\rm USNO}$ magnitude ( $H_{\rm o}=50$ km s^-1 Mpc^-1), Col. 10: classification, Col. 11: name.
Table 4: List of 103 QSO candidates identified with a ROSAT-FSC source and located in zone IVa. Column 1: right ascension, Col. 2: declination, Col. 3: separation between the ROSAT and USNO positions in arcsec, Col. 4: X-ray count rate (count s^-1), Col. 5: magnitude $O_{\rm USNO}$ , Col. 6: magnitude $O_{\rm APS}$ , Col. 7: APS O-E colour, Col. 8: redshift, Col. 9: absolute $O_{\rm USNO}$ magnitude, Col. 10: classification: DA, DN, WD: white dwarfs; *: stars; CV: cataclysmic variable; BL: BL Lac object; S1: Seyfert 1 galaxy; S1n: Narrow Line Seyfert 1; Q: QSO; Col. 11: reference: (1) OAGH and (2) OHP observations, Col. 12: name.