The object 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. Here we report on the analysis of all of these X-ray data and the results obtained. 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 ∼ 2 × 1012 G.

Ferrigno C., Bozzo E., Sanna A., Jaisawal G.K., Girard J.M., DI Salvo T., et al. (2019). IGR J17503-2636: A candidate supergiant fast X-ray transient. ASTRONOMY & ASTROPHYSICS, 624, A142 [10.1051/0004-6361/201935185].

IGR J17503-2636: A candidate supergiant fast X-ray transient

DI Salvo T.
Writing – Review & Editing
;
2019-01-01

Abstract

The object 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. Here we report on the analysis of all of these X-ray data and the results obtained. 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 ∼ 2 × 1012 G.
Settore FIS/05 - Astronomia E Astrofisica
https://ui.adsabs.harvard.edu/abs/2019A&A...624A.142F/abstract
Ferrigno C., Bozzo E., Sanna A., Jaisawal G.K., Girard J.M., DI Salvo T., et al. (2019). IGR J17503-2636: A candidate supergiant fast X-ray transient. ASTRONOMY & ASTROPHYSICS, 624, A142 [10.1051/0004-6361/201935185].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/407001
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