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

Michael A. Nowak, Adamantia Paizis, Gaurava K. Jaisawal, Jérôme Chenevez, Sylvain Chaty, Francis Fortin, Jérôme Rodriguez, Jörn Wilms

    Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review


    IGR J17591-2342 is an accreting millisecond X-ray pulsar discovered in 2018 August in scans of the Galactic bulge and center by the INTEGRAL X-ray and gamma-ray observatory. It exhibited an unusual outburst profile with multiple peaks in the X-ray, as observed by a variety of X-ray satellites over the course of three months. Here we present observations of this source performed in the X-ray/gamma-ray and near infrared domains. We focus on a simultaneous observation performed with the Chandra-High Energy Transmission Gratings Spectrometer (HETGS) and NICER. With the former instrument, we obtain high resolution spectra of the Si-edge region, which provide clues as to the source's distance and reveal evidence of an outflow with a velocity of 2800kms−1. We show that there is good agreement between the NICER and Chandra-HETGS continua, provided that one properly accounts for the differing manners in which these two instruments view the dust scattering halo in the foreground of this source. Unusually, we find a possible set of Ca lines in the HETGS spectra. We hypothesize that IGR J17591-2342 is a neutron star low mass X-ray binary at a 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.
    Original languageEnglish
    Publication date2019
    Number of pages1
    Publication statusPublished - 2019
    EventHEAD17 - Annual Meeting for High Energy Astrophysics Division - Monterey, United States
    Duration: 17 Mar 201921 Mar 2019


    ConferenceHEAD17 - Annual Meeting for High Energy Astrophysics Division
    Country/TerritoryUnited States


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