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Table 1

Useful reference numbers for the different samples used throughout this work.

Category No. of sources
Hard X-ray selected sample 5466
Point-like sources 5087
Clean, point-like sources (CPL) 4895
Hard-only CPL sources 684
CPL sources in the LS10 area 2863
Hard-only CPL in LS10 363
CPL soft sources outside the LS10 area 1710
Hard-only outside LS10 321
CPL extragalactic (spec-z>0.002) 1538
CPL Galactic 325
CPL in LS10 with good p_any 2547
Hard-only good p_any 111
Good p_any with spec-z>0.002 (non-beamed) 1243
Hard-only good p_any with spec-z>0.002 (non-beamed) 23
Stars 325
Beamed AGN 319
BAT matches 487
CPL BAT matches 456
Other AGN outside LS10 692

Final spec-z sample (Sect. 8.1) 1328
Final spec-z hard-only 29

Notes. We caution that the hard-only subsamples suffer from higher contamination from spurious X-ray sources, as shown in Fig. 2; further cuts on DET_LIKE_3 or p_any could be made to improve upon this.

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