Journal
ASTROPHYSICAL JOURNAL
Volume 874, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab0a71
Keywords
accretion, accretion disks; pulsars: general; stars: low-mass; stars: neutron; X-rays: binaries
Categories
Funding
- National Aeronautics and Space Administration through Chandra Guest Observer [GO8-19022X]
- ASI/INAF [2013-025.R1]
- ASI-INAF [2017-14-H.0]
- French Space Agency (CNES)
- Centre National d'Etudes Spatiales (CNES)
- Marie Sklodowska-Curie Actions [713683]
- ESA member states
- Czech Republic
- European Organisation for Astronomical Research in the Southern Hemisphere under ESO program [0101.D-0082(A)]
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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.
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