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|Title:||IGR J17329-2731: The birth of a symbiotic X-ray binary||Authors:||Bozzo, E.
Russell, D. M.
di Salvo, T.
|Issue Date:||2018||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||613||First Page:||A22||Abstract:||We report on the results of the multiwavelength campaign carried out after the discovery of the INTEGRAL transient IGR J17329-2731. The optical data collected with the SOAR telescope allowed us to identify the donor star in this system as a late M giant at a distance of 2.7<SUB>-1.2</SUB><SUP>+3.4</SUP> kpc. The data collected quasi-simultaneously with XMM-Newton and NuSTAR showed the presence of a modulation with a period of 6680 ± 3 s in the X-ray light curves of the source. This unveils that the compact object hosted in this system is a slowly rotating neutron star. The broadband X-ray spectrum showed the presence of a strong absorption (≫10<SUP>23</SUP> cm<SUP>-2</SUP>) and prominent emission lines at 6.4 keV, and 7.1 keV. These features are usually found in wind-fed systems, in which the emission lines result from the fluorescence of the X-rays from the accreting compact object on the surrounding stellar wind. The presence of a strong absorption line around 21 keV in the spectrum suggests a cyclotron origin, thus allowing us to estimate the neutron star magnetic field as 2.4 × 10<SUP>12</SUP> G. All evidencethus suggests IGR J17329-2731 is a symbiotic X-ray binary. As no X-ray emission was ever observed from the location of IGR J17329-2731 by INTEGRAL (or other X-ray facilities) during the past 15 yr in orbit and considering that symbiotic X-ray binaries are known to be variable but persistent X-ray sources, we concluded that INTEGRAL caught the first detectable X-ray emission from IGR J17329-2731 when the source shined as a symbiotic X-ray binary. The Swift XRT monitoring performed up to 3 months after the discovery of the source, showed that it maintained a relatively stable X-ray flux and spectral properties.||URI:||http://hdl.handle.net/20.500.12386/30150||URL:||https://www.aanda.org/articles/aa/abs/2018/05/aa32588-18/aa32588-18.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201832588||Bibcode ADS:||2018A&A...613A..22B||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jun 14, 2021
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