IGR J18179-1621: an obscured X-ray pulsar discovered by INTEGRAL
Abstract
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.
Appendix A is available in electronic form at http://www.aanda.org- Publication:
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Astronomy and Astrophysics
- Pub Date:
- September 2012
- DOI:
- 10.1051/0004-6361/201219344
- arXiv:
- arXiv:1207.4557
- Bibcode:
- 2012A&A...545A..83B
- Keywords:
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- X-rays: binaries;
- stars: individual: IGR J18179-1621;
- stars: neutron;
- X-rays: stars;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted for publication on A&