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(abridged) Hard X-ray surveys performed by the INTEGRAL satellite havediscovered a conspicuous fraction (up to 30%) of unidentified objects among thedetected sources. Here we continue our identification program by selectingprobable optical candidates using positional cross-correlation with soft X-ray,radio, and/or optical archives, and performing optical spectroscopy on them. Asa result, we identified or more accurately characterized 44 counterparts ofINTEGRAL sources: 32 active galactic nuclei, with redshift 0.019 < z < 0.6058,6 cataclysmic variables (CVs), 5 high-mass X-ray binaries (2 of which in theSmall Magellanic Cloud), and 1 low-mass X-ray binary. This was achieved byusing 7 telescopes of various sizes and archival data from two onlinespectroscopic surveys. The main physical parameters of these hard X-ray sourceswere also determined using the available multiwavelength information. AGNs arethe most abundant population among hard X-ray objects, and our results confirmthis tendency when optical spectroscopy is used as an identification tool. Thedeeper sensitivity of recent INTEGRAL surveys enables one to begin detectinghard X-ray emission above 20 keV from sources such as LINER-type AGNs andnon-magnetic CVs.

Unveiling the nature of INTEGRAL objects through optical spectroscopy. VIII. Identification of 44 newly detected hard X-ray sources