IGR J17252-3616: An accreting pulsar observed by INTEGRAL and XMM-Newton

Abstract

IGR J17252-3616 is the hard X-ray counterpart of EXO 1722-363. The regular monitoring by INTEGRAL shows that IGR J17252-3616 is a persistent source with an average count rate of ∼6.4 mCrab in the 20-60 keV energy band. A follow-up observation with XMM-Newton showed that the source is located at R.A. (2000.0) = 17h25m 11.4s and Dec. = -36°16′58. 6″ with an uncertainty of 4″. The source is a binary X-ray pulsar with a spin period of 413.7 s. The spectral shape is typical for an accreting pulsar except that a huge intrinsic absorption and a cold iron fluorescence line are detected. The absorbing column density and cold iron line do not vary with the pulse period. The observations suggest that the source is a wind-fed accreting pulsar accompanied by a supergiant star. © 2006 International Astronomical Union.