| Issue |
A&A
Volume 545, September 2012
|
|
|---|---|---|
| Article Number | A83 | |
| Number of page(s) | 8 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/201219344 | |
| Published online | 11 September 2012 | |
Research Note
IGR J18179-1621: an obscured X-ray pulsar discovered by INTEGRAL ⋆
1
ISDC, Data Center for Astrophysics of the University of
Geneva,
chemin d’Écogia 16,
1290
Versoix,
Switzerland
e-mail: enrico.bozzo@unige.ch
2
International Space Science Institute (ISSI),
Hallerstrasse 6,
3012
Bern,
Switzerland
Received: 4 April 2012
Accepted: 19 July 2012
We report on all the INTEGRAL and Swift data collected during the first outburst observed from IGR J18179-1621. The broad-band spectral analysis showed that the X-ray emission from the source is heavily absorbed (NH ≃ 1023 cm-2), and well-described by a flat power-law with a high energy rollover (cutoff energy 9−12 keV, e-folding energy 4−7 keV). We found some evidence of a cyclotron absorption feature at 22 ± 1 keV. Together with the pulsations at 11.8 s discovered in the XRT data, this evidence would suggest that IGR J18179-1621 is an obscured, magnetized, accreting neutron star that is possibly part of a supergiant high-mass X-ray binary or a Be X-ray binary system.
Key words: X-rays: binaries / stars: individual: IGR J18179-1621 / stars: neutron / X-rays: stars
Appendix A is available in electronic form at http://www.aanda.org
© ESO, 2012
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