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Searching for AGNs among unidentified INTEGRAL sources

Authors :: Maiorano, E.
Landi, R.
Stephen, J. B.
Bassani, L.
Masetti, N.
Parisi, P.
Palazzi, E.
Parma, P.
Bird, A. J.
Bazzano, A.
Ubertini, P.
Jimenez-Bailon, E.
Chavushyan, V.
Galaz, G.
Minniti, D.
Morelli, L.
Maiorano, E.
Landi, R.
Stephen, J. B.
Bassani, L.
Masetti, N.
Parisi, P.
Palazzi, E.
Parma, P.
Bird, A. J.
Bazzano, A.
Ubertini, P.
Jimenez-Bailon, E.
Chavushyan, V.
Galaz, G.
Minniti, D.
Morelli, L.
Publication Year :: 2011
Abstract: We report on a new method to identify Active Galactic Nuclei (AGN) among unidentified INTEGRAL sources. This method consists of cross-correlating unidentified sources listed in the fourth IBIS Survey Catalogue first with infrared and then with radio catalogues and a posteriori verifying, by means of X-ray and optical follow up observations, the likelihood of these associations. In order to test this method, a sample of 8 sources has been extracted from the fourth IBIS Catalogue. For 7 sources of the sample we obtained an identification, whereas the last one (IGR J03103+5706) has insufficient information for a clear classification and deserves more in-depth study. We identified three objects (IGR J08190-3835, IGR J17520-6018, IGR J21441+4640) as AGNs and suggest that three more (IGR J00556+7708, IGRJ17219-1509, IGR J21268+6203) are likely active galaxies on the basis of their radio spectra, near-infrared photometry and location above the Galaxy plane. One source (IGR J05583-1257) has been classified as a starburst galaxy but it might have been spuriously associated with the INTEGRAL detection.<br />Comment: 11 pages, 4 figures, 6 tables; accepted for publication on MNRAS