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Issue A&A
Volume 447, Number 3, March I 2006
Page(s) 1027 - 1034
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20053809



A&A 447, 1027-1034 (2006)
DOI: 10.1051/0004-6361:20053809

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

A. Bodaghee1, 2, R. Walter1, 2, J. A. Zurita Heras1, 2, A. J. Bird3, T. J.-L. Courvoisier1, 2, A. Malizia4, R. Terrier5, 6 and P. Ubertini7

1  INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
    e-mail: arash.bodaghee@obs.unige.ch
2  Observatoire de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
3  School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
4  IASF/CNR, Via Gobetti 101, 40129 Bologna, Italy
5  CEA-Saclay, DAPNIA/Service d'Astrophysique, 91191 Gif-sur-Yvette Cedex, France
6  Fédération de recherche APC, Collège de France, 11 place Marcelin Berthelot, 75231 Paris, France
7  IASF/CNR, Via Fosso del Cavaliere 100, 00133 Rome, Italy

(Received 11 July 2005 / Accepted 27 September 2005)

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 $5.1\times10^{-11}$ erg cm-2 s-1, with variations in intensity by at least an order of magnitude. A pulse period of 912.0$\pm$0.1 s was discovered in the ISGRI and EPIC light curves. The source spectrum is a strongly-absorbed ( $N_{\mathrm{H}}=(2.5\pm0.2)\times10^{23}$ cm-2) 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 $\gtrsim$7.1 keV, and a soft excess emission of $7\times10^{-15}$ erg cm-2 s-1 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 RA (J2000 )=16h39m05.4s and $\rm Dec=-46^{\circ}42'12''$ (4'' uncertainty) which is compatible with that of 2MASS J16390535-4642137.


Key words: gamma-rays: observations -- X-rays: binaries -- pulsars: individuals: IGR J16393-4643 -- pulsars: individuals: AX J1639.0-4642

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© ESO 2006


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