Fig. 3.
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WISE colour-colour diagram of 34 AGN candidates. The lines from Secrest et al. (2015) delimit the area populated by AGN. Six sources (IGR J03574-6602, IGR J06075-6148, IGR J06503-7742, IGR J16246-4556, IGR J16459-2325, and IGR J17255-4509) have low W1 − W2 values and need to be investigated further. The only source with W2 − W3 below two is AX J 1830.6-1002, which is a very peculiar case.
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