Chandra-Hetgs Characterization of an Outflowing Wind in the Accreting Millisecond Pulsar Igr J17591−2342
Draft version February 27, 2019 Typeset using LATEX twocolumn style in AASTeX61 CHANDRA-HETGS CHARACTERIZATION OF AN OUTFLOWING WIND IN THE ACCRETING MILLISECOND PULSAR IGR J17591−2342 Michael A. Nowak,1 Adamantia Paizis,2 Gaurava Kumar Jaisawal,3 Jer´ ome^ Chenevez,3 Sylvain Chaty,4 Francis Fortin,4 Jer´ ome^ Rodriguez,4 andJ orn¨ Wilms5 1Physics Dept., CB 1105, Washington University, One Brookings Drive, St. Louis, MO 63130-4899 2Istituto Nazionale di Astrofisica, INAF-IASF, Via Alfonso Corti 12, I-20133 Milano, Italy 3National Space Institute, Technical University of Denmark, Elektrovej 327-328, DK-2800 Lyngby, Denmark 4AIM, CEA, CNRS, Universit´eParis-Saclay, Universit´eParis-Diderot, Sorbonne Paris Cit´e,F-91191 Gif sur Yvette, France 5Dr. Karl Remeis-Observatory & ECAP, University of Erlangen-Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germany (Received 2019 January; Accepted 2019 February) Submitted to ApJ ABSTRACT 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 several X-ray satellites over three 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). HETGS provides high resolution spectra of the Si-edge region, which yield clues as to the source's distance and reveal evidence (at 99.999% significance) of an outflow with a velocity of 2 800 km s−1.
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