Refereed journal article or data article (A1)
Polarization Properties of the Weakly Magnetized Neutron Star X-Ray Binary GS 1826-238 in the High Soft State
List of Authors: Capitanio F, Fabiani S, Gnarini A, Ursini F, Ferrigno C, Matt G, Poutanen J, Cocchi M, Mikusincova R, Farinelli R, Bianchi S, Kajava JJE, Muleri F, Sanchez-Fernandez C, Soffitta P, Wu KW, Agudo I, Antonelli LA, Bachetti M, Baldini L, Baumgartner WH, Bellazzini R, Bongiorno SD, Bonino R, Brez A, Bucciantini N, Castellano S, Cavazzuti E, Ciprini S, Costa E, De Rosa A, Del Monte E, Di Gesu L, Di Lalla N, Di Marco A, Donnarumma I, Doroshenko V, Dovciak M, Ehlert SR, Enoto T, Evangelista Y, Ferrazzoli R, Garcia JA, Gunji S, Hayashida K, Heyl J, Iwakiri W, Jorstad SG, Karas V, Kitaguchi T, Kolodziejczak JJ, Krawczynski H, La Monaca F, Latronico L, Liodakis I, Maldera S, Manfreda A, Marin F, Marinucci A, Marscher AP, Marshall HL, Mitsuishi I, Mizuno T, Ng CY, O'Dell SL, Omodei N, Oppedisano C, Papitto A, Pavlov GG, Peirson AL, Perri M, Pesce-Rollins M, Petrucci PO, Pilia M, Possenti A, Puccetti S, Ramsey BD, Rankin J, Ratheesh A, Romani RW, Sgro C, Slane P, Spandre G, Tamagawa T, Tavecchio F, Taverna R, Tawara Y, Tennant AF, Thomas NE, Tombesi F, Trois A, Tsygankov SS, Turolla R, Vink J, Weisskopf MC, Xie F, Zane S
Publisher: IOP Publishing Ltd
Publication year: 2023
Journal: Astrophysical Journal
Journal name in source: ASTROPHYSICAL JOURNAL
Journal acronym: ASTROPHYS J
Volume number: 943
Issue number: 2
Number of pages: 10
ISSN: 0004-637X
DOI: http://dx.doi.org/10.3847/1538-4357/acae88
URL: https://iopscience.iop.org/article/10.3847/1538-4357/acae88
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/178965999
The launch of the Imaging X-ray Polarimetry Explorer (IXPE) on 2021 December 9 has opened a new window in X-ray astronomy. We report here the results of the first IXPE observation of a weakly magnetized neutron star, GS 1826-238, performed on 2022 March 29-31 when the source was in a high soft state. An upper limit (99.73% confidence level) of 1.3% for the linear polarization degree is obtained over the IXPE 2-8 keV energy range. Coordinated INTEGRAL and NICER observations were carried out simultaneously with IXPE. The spectral parameters obtained from the fits to the broadband spectrum were used as inputs for Monte Carlo simulations considering different possible geometries of the X-ray emitting region. Comparing the IXPE upper limit with these simulations, we can put constraints on the geometry and inclination angle of GS 1826-238.
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