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IGR J16393-4643: a new heavily-obscured X-ray pulsar

A. Bodaghee·R. Walter·J. A. Zurita Heras·A. J. Bird·T. J. -L. Courvoisier·A. Malizia·R. Terrier·P. Ubertini
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Abstract

An analysis of the high-energy emission from IGR J16393-4643 (=AX J1639.0-4642) is presented using data from INTEGRAL and XMM-Newton. The source is persistent in the 20-40 keV band at an average flux of 5.1x10^-11 ergs/cm2/s, with variations in intensity by at least an order of magnitude. A pulse period of 912.0+/-0.1 s was discovered in the ISGRI and EPIC light curves. The source spectrum is a strongly-absorbed (nH=(2.5+/-0.2)x10^23 atoms/cm2) power law that features a high-energy cutoff above 10 keV. Two iron emission lines at 6.4 and 7.1 keV, an iron absorption edge >7.1 keV, and a soft excess emission of 7x10^-15 ergs/cm2/s between 0.5-2 keV, are detected in the EPIC spectrum. The shape of the spectrum does not change with the pulse. Its persistence, pulsation, and spectrum place IGR J16393-4643 among the class of heavily-absorbed HMXBs. The improved position from EPIC is R.A. (J2000)=16:39:05.4 and Dec.=-46:42:12 (4" uncertainty) which is compatible with that of 2MASS J16390535-4642137.

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A. Bodaghee, R. Walter, J. A. Zurita Heras, A. J. Bird, T. J. -L. Courvoisier, A. Malizia, R. Terrier, P. Ubertini. 2005-10-06. IGR J16393-4643: a new heavily-obscured X-ray pulsar. https://doi.org/10.1051/0004-6361%3A20053809

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