$Chandra$-HETGS Characterization of an Outflowing Wind in the Accreting Millisecond Pulsar IGR J17591–2342 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astrophys.J. Année : 2019

$Chandra$-HETGS Characterization of an Outflowing Wind in the Accreting Millisecond Pulsar IGR J17591–2342

Michael A. Nowak
  • Fonction : Auteur
Adamantia Paizis
  • Fonction : Auteur
Gaurava Kumar Jaisawal
  • Fonction : Auteur
Jérôme Chenevez
  • Fonction : Auteur
Sylvain Chaty
Jörn Wilms
  • Fonction : Auteur

Résumé

An accreting millisecond X-ray pulsar, IGR J17591−2342 was discovered in 2018 August in scans of the Galactic bulge and center by the International Gamma-Ray Astrophysics Laboratory X-ray and gamma-ray observatory. It exhibited an unusual outburst profile with multiple peaks in the X-ray, as observed by several X-ray satellites over 3 months. Here we present observations of this source performed in the X-ray/gamma-ray and near-infrared domains and focus on a simultaneous observation performed with the Chandra High Energy Transmission Gratings Spectrometer (HETGS) and the Neutron Star Interior Composition Explorer (NICER). The HETGS provides high-resolution spectra of the Si edge region that yield clues as to the source’s distance and reveal evidence (at 99.999% significance) of an outflow with a velocity of 2800 km s−1. We demonstrate good agreement between the NICER and HETGS continua, provided that one properly accounts for the differing manners in which these instruments view the dust-scattering halo in the source’s foreground. Unusually, we find a possible set of Ca lines in the HETGS spectra (with significances ranging from 97.0% to 99.7%). We hypothesize that IGR J17591−2342 is a neutron star low-mass X-ray binary at the distance of the Galactic bulge or beyond that may have formed from the collapse of a white dwarf system in a rare, calcium-rich Type Ib supernova explosion.

Dates et versions

hal-02074495 , version 1 (20-03-2019)

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Citer

Michael A. Nowak, Adamantia Paizis, Gaurava Kumar Jaisawal, Jérôme Chenevez, Sylvain Chaty, et al.. $Chandra$-HETGS Characterization of an Outflowing Wind in the Accreting Millisecond Pulsar IGR J17591–2342. Astrophys.J., 2019, 874 (1), pp.69. ⟨10.3847/1538-4357/ab0a71⟩. ⟨hal-02074495⟩
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