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

Published online by Cambridge University Press:  12 May 2006

A. Bodaghee ,
R. Walter ,
J. A. Zurita Heras ,
A. J. Bird ,
T. J.-L. Courvoisier ,
A. Malizia ,
R. Terrier  and
P. Ubertini
A. Bodaghee
Affiliation:
INTEGRAL Science Data Centre, Chemin d'Ecogia 16, CH–1290 Versoix, Switzerland email: Arash.Bodaghee@obs.unige.ch Observatoire de Genève, Chemin des Maillettes 51, CH–1290 Sauverny, Switzerland Present address: ISDC, Chemin d'Ecogia 16, CH–1290 Versoix, Switzerland.
R. Walter
Affiliation:
INTEGRAL Science Data Centre, Chemin d'Ecogia 16, CH–1290 Versoix, Switzerland email: Arash.Bodaghee@obs.unige.ch Observatoire de Genève, Chemin des Maillettes 51, CH–1290 Sauverny, Switzerland
J. A. Zurita Heras
Affiliation:
INTEGRAL Science Data Centre, Chemin d'Ecogia 16, CH–1290 Versoix, Switzerland email: Arash.Bodaghee@obs.unige.ch Observatoire de Genève, Chemin des Maillettes 51, CH–1290 Sauverny, Switzerland
A. J. Bird
Affiliation:
School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK
T. J.-L. Courvoisier
Affiliation:
INTEGRAL Science Data Centre, Chemin d'Ecogia 16, CH–1290 Versoix, Switzerland email: Arash.Bodaghee@obs.unige.ch Observatoire de Genève, Chemin des Maillettes 51, CH–1290 Sauverny, Switzerland
A. Malizia
Affiliation:
IASF/CNR, Via Piero Gobetti 101, I–40129 Bologna, Italy
R. Terrier
Affiliation:
CEA-Saclay, DAPNIA/Service d'Astrophysique, F–91191 Gif-sur-Yvette, France Fédération de recherche APC, Collège de France 11, place Marcelin Berthelot, F–75231 Paris, France
P. Ubertini
Affiliation:
IASF/CNR, Via Fosso del Cavaliere 100, I–00133 Roma, Italy
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Abstract

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An analysis of the high-energy emission from IGR J16393–4643 is presented using data from INTEGRAL and XMM-Newton. The source is persistent in the 20–40 keV band at an average flux of $5.1\times10^{-11}$ergs cm$^{-2}$ s$^{-1}$, with variations in intensity by at least an order of magnitude. A pulse period of 912$\,{\pm}\,$3 s was discovered in the ISGRI and EPIC light curves. The source spectrum is a strongly-absorbed ($N_{\mathrm{H}}=(2.5\,{\pm}\,0.2)\times10^{23}$ cm$^{-2}$) power law that features a high-energy cutoff above 15 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 $7\times10^{-15}$ergs 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 R.A. (J2000)$=16^{\mathrm{h}}39^{\mathrm{m}}05.4^{\mathrm{s}}$ and Dec.$=-46^{\circ}42'12''$ ($4''$ uncertainty) which is compatible with that of 2MASS J16390535–4642137.

Keywords

X-rays: binariesX-rays: individual: IGR J16393–4643=AX J163904–4642
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 345 - 346
Copyright
2006 International Astronomical Union