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Landi, R; Bassani, L; Bazzano, A; Bird, A. J; Fiocchi, M; Malizia, A; Panessa, F; Sguera, V; Ubertini, P
Monthly Notices of the Royal Astronomical Society, 08/2017, Letnik: 470, Številka: 1Journal Article
Abstract The latest INTEGRAL/IBIS all-sky survey lists 219 hard X-ray sources whose nature is still unknown. We report on our ongoing campaign aimed at identifying these high-energy emitters by exploiting the focusing capabilities of the X-ray Telescope (XRT, 0.2–10 keV) onboard Swift, which allow an enhancement of the source localization to arcsec level, thus facilitating the identification of the likely counterpart. By cross-correlating the list of the unidentified IBIS sources included in the latest IBIS catalogue with Swift/XRT archival data, we found a set of 14 objects, not yet reported in the literature, for which XRT data were available. We found no detection in only one case, a single X-ray association in nine sources and 2/3 associations in the remaining objects. We then made use of multiwaveband archives to search for counterparts at other wavelengths of these XRT detections and exploited X-ray spectral information in an attempt to determine their nature and association with the IBIS object. As a result of our analysis, we identified a single counterpart for 13 sources, although in some cases its nature/class could not be assessed on the basis of the information collected. More specifically, we found that SWIFT J0924.2−3141 and SWIFT J1839.1−5717 are absorbed AGN, while SWIFT J0800.7−4309 and 1SWXRT J230642.8+550817 are cataclysmic variable binary systems. Finally, we found that IGR J14059−6116 is likely associated with the Fermi source 3FGL J1405.4−6119. In the case of XMMSL1 J030715.5−545536, no XRT counterpart was detected. In all the other cases, optical/infrared spectroscopy is necessary to classify properly each X-ray counterpart and confirm their association with the INTEGRAL/IBIS detection.
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in: SICRIS
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