Volume 508, Number 3, December IV 2009
|Page(s)||1275 - 1278|
|Published online||27 October 2009|
Suzaku observation of IGR J16318-4848
Dr. Karl Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstraße 7, 96049 Bamberg, Germany e-mail: email@example.com
2 CRESST, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
3 NASA Goddard Space Flight Center, Astrophysics Science Division, Code 661, Greenbelt, MD 20771, USA
4 MIT Kavli Institute for Astrophysics and Space Research, 77, Massachusetts Avenue, 37-241, Cambridge, MA 02139, USA
5 INTEGRAL Science Data Centre, Geneva Observatory, University of Geneva, Chemin d'Écogia 16, 1290 Versoix, Switzerland
6 Space Sciences Laboratory, University of California Berkeley, 7 Gauss Way, Berkeley, CA 94720-7450, USA
Accepted: 19 October 2009
We report on the first Suzaku observation of IGR J16318-4848, the most extreme example of a new group of highly absorbed X-ray binaries that have recently been discovered by the International Gamma-Ray Astrophysics Laboratory (INTEGRAL). The Suzaku observation was carried out between 2006 August 14 and 17, with a net exposure time of 97 ks. The average X-ray spectrum of the source can be well described () with a continuum model typical for neutron stars i.e., a strongly absorbed power law continuum with a photon index of 0.676(42) and an exponential cutoff at 20.5(6) keV. The absorbing column is . Consistent with earlier work, strong fluorescent emission lines of Fe , Fe , and Ni are observed. Despite the large , no Compton shoulder is seen in the lines, arguing for a non-spherical and inhomogeneous absorber. Seen at an average 5–60 keV absorbed flux of , the source exhibits significant variability on timescales of hours.
Key words: stars: individual IGR J16318–4848 / binaries: general / X-rays: binaries
© ESO, 2009
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