6533b833fe1ef96bd129c203
RESEARCH PRODUCT
IGR J17503–2636: a candidate supergiant fast X-ray transient
Gaurava K. JaisawalEnrico BozzoCarlo FerrignoT. Di SalvoJ. M. GirardA. SannaLuciano Burderisubject
AccretionX-ray transientAstrophysics::High Energy Astrophysical PhenomenaCyclotronFOS: Physical sciencesAstrophysics01 natural scienceslaw.inventionbinaries [x-rays]X-rays: binariesSettore FIS/05 - Astronomia E AstrofisicaMethods: observationalBinaries: closelaw0103 physical sciencesSpectral analysis010303 astronomy & astrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)individuals: IGR J17503-2636 [X-rays]010308 nuclear & particles physicsScatteringAstronomy and AstrophysicsStars: neutronAccretion (astrophysics)Neutron starAccretion diskSpace and Planetary ScienceSpectral energy distributionSupergiantAstrophysics - High Energy Astrophysical Phenomenadescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-03-07 | Astronomy & Astrophysics |