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.
J2000 USNO position                    
h m s $^{\circ}$ ' '' '' c/r $O_{\rm US}$ $O_{\rm APS}$ O-E z $M_{\rm abs}$   Ref. Name

0

 11 19.46 28 17 50.8 18.7 0.023 15.5 15.88 0.12     * 1  
0 13 4.80 10 11 28.6 5.8 0.023 16.0 16.25 0.32 0.239 -24.9 Q 1  
0 40 46.17 18 54 24.3 17.0 0.026 16.0 16.71 -0.12 0.153 -23.3 Q 1  
1 7 37.51 22 22 32.3 33.7 0.042 16.2 16.89 0.68     * 2  
1 20 46.96 23 31 40.1 28.7 0.047 15.9 16.27 0.54     * 2  
1 37 37.24 30 2 49.1 13.1 0.035 13.5 16.90 0.36     DN   TX Tri
2 55 30.70 7 25 57.1 19.4 0.030 16.3 16.97 0.66 0.707 -27.0 Q 1  
3 53 15.60 9 56 35.1 24.0 0.030 16.0 16.49 -0.82     * 2  
8 23 46.65 24 53 51.2 18.5 0.039 15.6 15.83 -0.40     WD 1 TON 316
8 39 34.28 23 34 10.4 12.8 0.041 15.8 16.49 -0.52     DA   PG 0836+237
8 45 51.14 60 9 13.7 13.3 0.027 16.0 16.30 -0.46     DA   PG 0841+603
8 50 20.09 54 33 50.5 17.3 0.038 16.4 16.78 0.62     * 1  
8 56 32.44 50 41 14.1 5.1 0.027 15.8 15.57 -0.58 0.235 -25.0 Q 1  
9 3 32.62 16 26 1.4 21.7 0.037 16.2 16.59 0.24     * 1 LB 9181
9 10 35.38 31 27 45.9 27.0 0.048 16.3 16.21 0.42     * 1  
9 10 37.97 53 12 2.8 19.3 0.030 16.4 16.82 0.52     * 1  
9 12 15.50 1 19 59.3 3.8 0.041 16.5 16.76 -0.50     * 1  
9 20 47.61 51 25 38.8 33.1 0.021 15.7 15.65 0.12     * 1  
9 30 6.76 52 28 4.0 12.0 0.039 15.8 16.37 -0.02     *   PG 0926+527
9 30 21.87 23 53 30.1 19.2 0.027 16.0 16.70 0.14 0.243 -24.3 Q 1  
9 30 34.46 20 44 16.9 5.2 0.045 16.1 17.09 0.64 1.169 -28.4 Q 1  
9 45 13.97 15 10 11.7 17.9 0.057 15.8 17.66 0.86     * 1  
9 46 34.50 13 50 58.3 34.4 0.027 15.8 16.75 0.10     CV 1  
9 49 39.77 17 52 49.5 12.0 0.021 16.3 18.65 0.60          
9 52 45.70 2 9 38.7 17.1 0.025 15.2 16.32 -0.76     DA   PG 0950+024
9 56 49.88 29 50 14.6 10.7 0.046 15.4 16.09 -0.10 0.845 -28.5 Q 1 TON 465
9 57 11.78 63 10 10.2 3.8 0.024 16.4 16.25 -0.06 0.918 -27.6 Q 1  
10 6 14.64 44 19 7.1 15.6 0.030 16.5 16.93 -0.30     DA    
10 34 53.07 44 57 23.1 20.5 0.023 16.1 16.57 0.38 1.422 -29.0 Q 1  
10 35 27.50 49 58 27.7 22.8 0.021 16.5 17.44 0.36 1.427 -28.5 Q 1  
10 44 19.33 19 57 47.9 24.2 0.039 15.6 15.90 0.44     * 1  
10 46 42.30 39 20 18.2 8.3 0.043 16.4 17.16 0.22 0.390 -25.3 Q 1  
10 47 30.55 10 17 28.9 17.7 0.228 15.4 15.81 0.08 0.145 -24.3 Q 1  
11 8 42.46 16 50 40.2 31.2 0.030 15.6 16.48 0.04     * 1  
11 14 1.95 52 27 11.6 29.8 0.023 15.5 15.62 0.40     * 1  
11 15 7.70 2 37 57.7 7.6 0.024 16.5 17.08 -0.04 0.564 -26.1 Q 1  
11 26 16.19 32 59 53.7 29.3 0.029 16.2 15.66 0.24     * 1  
11 33 31.23 58 57 47.8 19.9 0.025 15.9 15.98 0.44     * 1  
11 34 25.08 23 16 8.8 24.0 0.039 16.3 16.66 0.64     * 1  
11 38 36.32 47 55 10.0 13.3 0.046 16.1 17.53 -0.48     * 1  
11 41 52.82 25 35 33.5 10.8 0.042 16.3 16.82 -0.96     * 1  
11 47 47.34 26 0 49.0 10.9 0.042 15.5 15.84 0.00     * 1  
12 19 57.97 27 8 57.2 9.5 0.023 16.1 17.17 0.76     * 1  
12 31 25.72 25 55 59.8 5.7 0.032 15.8 16.16 0.54     * 1  
12 32 54.28 36 44 7.4 32.5 0.022 16.0 16.61 -0.08     WD 1 CBS 353
12 52 30.85 14 26 9.3 24.3 0.029 16.3 17.30 0.10          
12 57 37.02 16 30 48.6 13.5 0.035 16.1 16.95 0.66 1.017 -28.2 Q 1  
12 59 38.22 60 38 59.4 15.9 0.039 16.3 16.47 -0.48     * 1 SBS 1257+609
12 59 44.45 68 4 0.8 30.9 0.022 16.3 16.64 -0.72     * 1 FBS 1257+683
13 0 6.40 44 42 50.9 13.9 0.036 16.2 16.06 0.46     * 1  
13 10 11.30 7 58 16.5 21.2 0.030 15.8 16.52 -0.08 0.578 -27.0 Q 1  
13 13 15.90 9 18 20.4 27.7 0.021 16.4 17.34 0.10 1.790 -29.2 Q 1  
13 14 30.78 13 7 45.8 23.8 0.044 16.3 17.00 0.24 0.741 -27.1 Q 1  
13 20 1.10 7 18 17.1 21.1 0.038 16.5 16.97 0.74 0.866 -26.9 Q 1  
13 20 22.53 30 56 22.4 19.8 0.029 16.4 17.22 -0.04 1.587 -28.1 Q 1 US 583
13 24 47.70 3 24 32.9 15.5 0.040 16.5 16.84 0.54 0.303 -24.9 Q 1  
13 32 51.09 15 29 30.9 23.9 0.042 15.5 15.56 0.14     * 1  
13 33 45.80 5 38 42.6 22.2 0.028 15.5 15.74 0.10     * 1  
13 40 59.95 60 26 11.8 17.6 0.034 16.2 16.48 -0.68     DA   SBS 1339+606
13 42 46.90 18 44 43.8 22.4 0.039 16.4 16.69 0.12 0.382 -25.5 Q 1  
13 50 13.97 14 35 47.4 30.4 0.023 16.4 16.93 0.48     * 1  
13 51 25.25 19 5 33.4 10.8 0.027 16.4 16.89 0.64     * 1  
13 54 48.82 49 13 37.1 19.8 0.028 15.5 15.68 0.32     * 1  
13 55 43.99 20 12 31.8 19.9 0.030 15.6 16.11 0.30     * 1  
13 58 41.50 2 49 12.5 21.1 0.046 16.2 16.85 -0.08     * 1  
14 6 58.74 14 42 38.6 13.0 0.034 15.4 15.84 0.34 0.264 -25.7 Q 1  
14 9 39.24 28 16 49.9 25.2 0.035 16.1 16.93 0.34 0.165 -23.9 Q 1  
14 10 57.74 64 33 10.6 18.8 0.041 16.4 16.83 0.06 0.462 -25.9 Q 1  
14 17 30.16 13 0 1.6 11.6 0.021 15.7 16.00 0.38     * 1  
14 19 25.77 38 2 49.0 12.7 0.039 16.2 17.22 0.08 0.517 -26.3 Q 1  
14 31 10.98 14 23 8.3 3.7 0.022 16.1 15.91 -0.04 1.425 -29.0 Q 1  
14 47 50.12 38 5 30.3 12.2 0.023 15.8 16.28 0.04     * 1  
15 0 31.80 48 36 47.0 16.0 0.021 16.4 16.72 0.48 1.031 -27.9 Q 1  
15 5 27.62 29 47 18.7 8.7 0.036 15.0 15.65 -0.34 0.527 -27.6 Q 1 CSO 1080
15 8 32.28 67 42 43.4 9.0 0.032 16.0 17.12 0.14 0.336 -25.8 Q 1  
15 12 44.60 9 31 0.8 23.0 0.037 15.9 16.61 0.56     * 1  
15 16 32.30 12 13 50.5 10.6 0.028 16.2 17.26 0.78     BL 1  
15 44 3.76 26 48 38.6 21.7 0.023 16.4 17.15 0.74     * 1  
15 45 53.50 9 36 20.6 19.6 0.032 16.1 16.40 -0.22          
15 48 33.03 44 22 26.1 12.7 0.021 16.3 16.97 0.48 0.322 -25.2 Q 1  
15 51 9.60 45 42 52.1 22.5 0.036 15.6 15.95 0.32          
15 51 52.45 19 11 4.1 34.9 0.034 15.8 16.31 0.50          
15 53 4.93 35 48 28.6 25.2 0.033 16.1 17.20 0.72 0.722 -26.8 Q 1  
15 56 9.90 3 9 22.5 9.6 0.037 16.3 16.80 0.48 0.131 -23.2 S1n 1  
16 5 19.72 14 48 52.5 15.5 0.040 16.2 16.51 0.00 0.371 -25.7 Q 1  
16 9 47.80 7 12 33.2 27.8 0.021 16.4 16.95 0.64     * 1  
16 11 36.58 15 20 54.6 18.8 0.030 16.3 16.69 0.40 1.309 -28.6 Q 1  
16 17 42.10 6 2 23.8 20.4 0.078 15.5 15.69 0.42     * 1  
16 28 35.38 45 20 43.3 34.1 0.022 16.4 17.00 0.68     * 1  
16 30 9.65 45 16 37.9 21.7 0.022 16.5 16.96 0.32     * 1  
16 31 10.46 38 44 49.6 7.8 0.036 15.8 15.97 0.48     * 1  
16 45 20.15 61 35 9.7 3.8 0.023 16.4 16.89 0.64 0.410 -25.5 Q 1  
16 46 15.52 25 41 43.3 15.7 0.047 16.4 17.26 0.56 0.188 -23.9 Q 1  
17 18 28.97 57 34 22.3 6.4 0.039 15.9 16.07 0.48 0.100 -22.9 S1n 1  
17 20 13.19 49 55 26.4 28.8 0.027 16.0 15.89 0.36     * 1  
17 21 45.75 57 16 56.7 31.5 0.021 15.8 15.87 0.24     * 1  
17 28 13.44 32 22 5.8 10.8 0.022 16.4 17.08 0.34 0.563 -26.3 Q 1  
17 29 35.53 52 30 47.5 3.0 0.029 16.2 15.96 0.02 0.278 -25.0 Q 1  
17 49 12.30 55 12 8.9 28.7 0.023 16.3 16.58 0.44     WD 1  
22 37 31.84 10 19 4.0 3.8 0.024 16.5 16.77 -0.46 0.103 -22.5 S1 1  
22 37 33.28 10 18 42.7 26.3 0.024 15.9 16.10 0.50     * 1  
23 7 13.30 4 32 2.5 29.8 0.079 15.9 17.25 -0.92     * 1  
23 15 52.73 11 33 2.1 21.4 0.036 16.5 17.20 0.24 0.567 -26.2 Q 1 KUV 23134+1117


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