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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29013
Title: Chandra-HETGS Characterization of an Outflowing Wind in the Accreting Millisecond Pulsar IGR J17591-2342
Authors: Nowak, Michael A.
PAIZIS, ADAMANTIA 
Jaisawal, Gaurava Kumar
Chenevez, Jérôme
Chaty, Sylvain
Fortin, Francis
Rodriguez, Jérôme
Wilms, Jörn
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 874
Issue: 1
First Page: 69
Abstract: 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<SUP>-1</SUP>. 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.
URI: http://hdl.handle.net/20.500.12386/29013
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab0a71
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ab0a71
Bibcode ADS: 2019ApJ...874...69N
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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