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

Tiziana Di Salvo, Bozzo, Sanna, Jaisawal, Girard, Burderi, Ferrigno

Risultato della ricerca: Articlepeer review

3 Citazioni (Scopus)

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.
Lingua originaleEnglish
pagine (da-a)A142-
Numero di pagine6
RivistaASTRONOMY & ASTROPHYSICS
Volume624
Stato di pubblicazionePublished - 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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