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Table 1

Observational parameters and classification of the elusive sources.

3XMM IAU Name OBSID texp EPIC-pn NH,gal Sub- z (2) LHX M r (2)
SRCID (3XMM ···) (ks) counts (× 1020 cm-2) sample(1) (× 1042 erg s-1) (mag)

1780 J121048.0+393745 0112830201 58.9 331 ± 14 2.13 0.20 6.17 ± 1.21 22.3
3161 J094540.4+094749 0150970301 23.4 154 ± 15 2.50 0.16 6.44 ± 1.56 22.2
3173 J103342.7+392926 0506440101 87.8 498 ± 26 1.31 0.07 1.99 ± 0.31 21.5
7207 J095921.2+024030 0302351601 30.5 2017 ± 56 1.76 (nℬ) 0.26 16.97 ± 1.45 23.0
18567 J001804.8-005141 0403760701 27.1 1271 ± 39 2.99 (nℬ) 0.19 7.27 ± 1.29 19.5
18747 J135810.3+653300 0305920601 12.0 463 ± 26 1.38 (nℬ) 0.23 8.84 ± 1.65 21.8
28357 J134834.9+263109 0097820101 34.3 42599 ± 218 1.21 (nℬ) 0.06 8.24 ± 0.16 20.9
28899 J094240.9+480017 0201470101 11.9 393 ± 22 1.19 (nℬ) 0.20 2.61 ± 1.22 21.1
29911 J100234.8+024253 0203360101 26.0 416 ± 25 1.78 (nℬ) 0.20 2.79 ± 0.48 21.4
36405 J231858.2+000621 0305600601 16.0 169 ± 15 3.90 (nℬ) 0.32 12.84 ± 7.03 21.8
47793 J112758.2+583558 0112810101 20.6 123 ± 15 0.91 0.18 1.32 ± 0.53 21.9
88476 J080455.5+241124 0203280201 6.3 311 ± 19 3.92 (nℬ) 0.14 4.53 ± 1.22 22.0
93560 J015727.2-004041 0303110101 3.5 255 ± 20 2.61 (nℬ) 0.39 47.50 ± 21.50 22.3
93640 J015804.7-005222 0303110101 3.4 356 ± 22 2.50 0.08 1.18 ± 0.50 19.7
115294 J004335.9+001455 0303562201 4.4 155 ± 14 1.72 (nℬ) 0.11 5.32 ± 2.73 21.4
120992 J002253.2+001659 0407030101 27.0 207 ± 20 2.75 0.21 13.31 ± 2.42 21.4
126294 J011929.0-000839 0605391101 7.3 596 ± 26 3.35 (nℬ) 0.09 8.95 ± 2.30 20.8
155684 J030634.0-001355 0201120101 12.1 145 ± 19 6.14 0.22 1.71 ± 0.71 22.2
155872 J030705.8-000009 0142610101 40.3 1355 ± 42 6.27 (nℬ) 0.27 10.20 ± 1.62 21.0
266064 J212929.6+000102 0093030201 34.7 178 ± 20 3.67 0.13 1.95 ± 0.27 21.4
266125 J213026.2-000204 0093030201 34.6 144 ± 22 3.65 0.14 1.77 ± 0.89 21.7
275370 J104549.6+213106 0128531601 76.5 62 ± 13 1.83 0.14 1.17 ± 0.62 21.6
277671 J110738.9+520644 0304071201 5.9 167 ± 16 0.94 0.18 17.49 ± 4.78 22.1
282027 J102812.6+293223 0301650401 7.8 115 ± 13 1.91 (nℬ) 0.29 16.01 ± 12.10 21.7
291676 J115648.6+064753 0301651801 4.0 305 ± 19 1.14 (nℬ) 0.15 3.18 ± 2.85 22.2
294033 J111443.6+525834 0143650901 3.7 885 ± 31 0.97 (nℬ) 0.08 3.60 ± 0.86 21.4
297574 J112405.1+061248 0103863201 5.1 896 ± 33 4.61 (nℬ) 0.27 28.25 ± 4.80 22.5
303293 J091440.9+435716 0604680201 14.3 148 ± 18 1.45 0.19 2.74 ± 1.36 22.3
305003 J084058.1+383300 0502060201 16.1 991 ± 34 3.15 0.12 3.19 ± 0.61 21.5
321587 J094057.1+032400 0306050201 22.3 5213 ± 76 2.99 (nℬ) 0.06 4.91 ± 0.32 20.8
324308 J134235.6+262533 0108460101 25.6 1002 ± 33 1.03 (nℬ) 0.06 3.78 ± 0.44 20.9
337999 J151128.9+561317 0670650401 7.4 655 ± 29 1.38 (nℬ) 0.15 16.48 ± 2.91 22.4
339379 J151525.0+042146 0653810601 7.6 263 ± 22 3.57 0.10 3.91 ± 0.54 21.5
341733 J141449.5+361240 0148620101 13.9 1217 ± 17 1.01 (nℬ) 0.18 10.59 ± 1.19 21.4
348033 J123155.5+200333 0301450201 24.1 67 ± 11 2.58 0.11 1.51 ± 0.74 20.8
350309 J123748.5+092323 0504100601 17.6 2224 ± 51 1.47 (nℬ) 0.12 11.24 ± 2.14 21.7
350410 J123719.3+114915 0112840101 14.5 247 ± 20 2.83 0.11 2.26 ± 0.34 20.7
354458 J121613.0-032025 0305800701 3.8 136 ± 14 2.66 0.13 2.36 ± 0.73 21.6
356567 J122349.5+072657 0205090101 21.5 1288 ± 39 1.70 (nℬ) 0.07 1.82 ± 0.33 21.6
358675 J121814.8+142601 0147610101 13.4 456 ± 24 2.87 (nℬ) 0.13 4.45 ± 0.76 20.1
369702 J125821.3+013158 0658400601 14.0 2373 ± 52 1.45 (nℬ) 0.16 2.51 ± 0.64 21.1

Notes.

(∗)

This source is not an XMM-Newton target, nevertheless, detailed analysis of its serendipitous XMM data is presented by Zoghbi et al. (2008) (see also upper panel of Fig. 5).

(1)

The sub-sample names , and correspond respectively to the broad, narrow and unobscured narrow sub-samples. The classification given in brackets is discussed later, in Sect. 3.4.

(2)

The errors on the redshift z and the absolute r magnitude Mr are not shown because they are smaller than 1%.

(⋄)

EPIC-MOS counts; because there is no pn data for these sources.

(⋆)

Total EPIC counts.

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