Masetti, N., Parisi, P., Palazzi, E., Bassani, L., Landi, R., Malizia, A., Schiavone, F., Stephen, J.B., Jimenez-Bailon, E., Chavushyan, V., Morelli, L., Mason, E., Galaz, G., Minniti, D., Bird, A.J., Dean, A.J., McBride, V.A., Charles, P.A., Bazzano, A. and Ubertini, P. (2010) Revealing the nature of new unidentified INTEGRAL sources. arXiv.
Abstract
Since its launch on October 2002, the INTEGRAL satellite has revolutionized our knowledge of the hard X-ray sky thanks to its unprecedented imaging capabilities and source detection positional accuracy above 20 keV. Nevertheless, many of the newly-detected sources in the INTEGRAL sky surveys are of unknown nature. However, the combined use of available information at longer wavelengths (mainly soft X-rays and radio) and of optical spectroscopy on the putative counterparts of these new hard X-ray objects allows pinpointing their exact nature. Continuing our long-standing program running since 2004 (and with which we identified more than 100 INTEGRAL objects) here we report the classification, through optical spectroscopy, of 25 unidentified high-energy sources mostly belonging to the recently published 4th IBIS survey.
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