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IGR J17503-2636: a candidate supergiant fast X-ray transient
- Source :
- A&A 624, A142 (2019)
- Publication Year :
- 2019
-
Abstract
- IGR J17503-2636 is a hard X-ray transient discovered by INTEGRAL on 2018 August 11. This was the first ever reported X-ray emission from this source. Following the discovery, follow-up observations were carried out with Swift, Chandra, NICER, and NuSTAR. We report in this paper the analysis and results obtained from all these X-ray data. Based on the fast variability in the X-ray domain, the spectral energy distribution in the 0.5-80 keV energy range, and the reported association with a highly reddened OB supergiant at ~10 kpc, we conclude that IGR J17503-2636 is most likely a relatively faint new member of the supergiant fast X-ray transients. Spectral analysis of the NuSTAR data revealed a broad feature in addition to the typical power-law with exponential roll-over at high energy. This can be modeled either in emission or as a cyclotron scattering feature in absorption. If confirmed by future observations, this feature would indicate that IGR J17503-2636 hosts a strongly magnetized neutron star with B~2e12 G.<br />Comment: Submitted to A&A, revised version after referee's comments
- Subjects :
- Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Database :
- arXiv
- Journal :
- A&A 624, A142 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1903.03210
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1051/0004-6361/201935185