Journal Article

Searching for active galactic nuclei among unidentified <i>INTEGRAL</i> sources

E. Maiorano, R. Landi, J. B. Stephen, L. Bassani, N. Masetti, P. Parisi, E. Palazzi, P. Parma, A. J. Bird, A. Bazzano, P. Ubertini, E. Jiménez-Bailón, V. Chavushyan, G. Galaz, D. Minniti and L. Morelli

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 1, pages 531-540
Published in print September 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19065.x
Searching for active galactic nuclei among unidentified INTEGRAL sources

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We report on a new method to identify active galactic nuclei (AGNs) among unidentified INTEGRAL sources. This method consists of cross-correlating unidentified sources listed in the fourth Imager on Board the INTEGRAL Satellite (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 eight sources has been extracted from the fourth IBIS catalogue. For seven 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 and IGR J21441+4640) as AGNs and suggest that three more (IGR J00556+7708, IGRJ17219−1509 and 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.

Keywords: catalogues; surveys

Journal Article.  7169 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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