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

C. Ferrigno*, E. Bozzo, A. Sanna, G. K. Jaisawal, J. M. Girard, T. Di Salvo, L. Burderi

*Corresponding author for this work

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    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.
    Original languageEnglish
    Article numberA142
    JournalAstronomy and Astrophysics
    Number of pages6
    Publication statusPublished - 2019


    • x-rays: binaries
    • X-rays: individuals: IGR J17503-2636


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