Polarization properties of the weakly magnetized neutron star X-ray binary GS 1826-238 in the high soft state

Capitanio, Fiamma; Fabiani, Sergio; Gnarini, Andrea; Ursini, F.; Ferrigno, C.; Matt, Giorgio; Poutanen, Juri; Cocchi, Massimo; Mikušincová, Romana; Farinelli, R.; Bianchi, S.; Kajava, J. J. E.; Muleri, Fabio; Sánchez–Fernández, C.; Soffitta, P.; Wu, Kinwah; Agudo, I.; Antonelli, L. A.; Bachetti, Matteo; Baldini, Luca; Baumgartner, W. H.; Bellazzini, R.; Bongiorno, Stephen D.; Bonino, R.; Brez, A.; Bucciantini, N.; Castellano, Simone; Cavazzuti, E.; Ciprini, S.; Costa, E.; Rosa, A. De; Monte, E. Del; Gesu, Laura Di; Lalla, N. Di; Marco, Alessandro Di; Donnarumma, I.; Doroshenko, V. T.; Dovčiak, Michal; Ehlert, Steven R.; Enoto, T.; Evangelista, Y.; Ferrazzoli, Riccardo; García, Javier Avilés; Gunji, Shuichi; Hayashida, Kentaro; Iwakiri, W.; Jorstad, Svetlana G.; Karas, Vladimír; Kitaguchi, Takao; Kolodziejczak, Jeffery J.; Krawczynski, H.; Monaca, Fabio La; Latronico, L.; Liodakis, Ioannis; Maldera, S.; Manfreda, Alberto; Marin, Fréedèric; Marinucci, Andrea; Marscher, A. P.; Marshall, Herman L.; Mitsuishi, Ikuyuki; Mizuno, T.; Ng, C. -Y.; O’Dell, Stephen L.; Omodei, N.; Oppedisano, C.; Papitto, A.; Pavlov, G. G.; Peirson, Abel L.; Perri, M.; -Rollins, Melissa Pesce; Petrucci, Pierre-Olivier; Pilia, M.; Possenti, A.; Puccetti, S.; Ramsey, Brian D.; Rankin, John; Ratheesh, Ajay; Romani, Roger W.; Sgrò, C.; Slane, Patrick; Spandre, G.; Tamagawa, Toru; Tavecchio, F.; Taverna, Roberto; Tawara, Yuzuru; Tennant, Allyn F.; Thomas, N.; Tombesi, Francesco; Trois, A.; S., Tsygankov, Sergey; Turolla, R.; Vink, Jacco; Weisskopf, Martin C.; Xie, Fei; Zane, S.

doi:10.48550/arxiv.2212.12472

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“…However, these models are degenerate with respect to the geometry and location of corona, and polarization information, if available, can be used to constrain them. Recent polarimetric studies of several NS-LMXBs such as Sco X-1 (Long et al 2022), Cyg X-2 (Farinelli et al 2023) and GS 1826 − 238 (Capitanio et al 2022) have revealed the capability of polarization studies in inferring the source geometry and emission properties. In this letter, we present the first spectropolarimetric study of the bright atoll source GX 9+9 using IXPE observations and archival AstroSat data.…”

Section: Introductionmentioning

confidence: 99%

Spectro-polarimetric view of bright atoll source GX 9+9 using IXPE and AstroSat

Rwitika¹,

Agrawal²,

Jayasurya³

et al. 2023

Preprint

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We have carried out the first spectro-polarimetric study of the bright NS-LMXB GX 9+9 using IXPE and AstroSat observations. We report a significant detection of polarization of 1.7 ± 0.4% over the 2 − 8 keV energy band, with a polarization angle of 63 • ± 7 • . The polarization is found to be energy-dependent, with a 3σ polarization degree consistent with null polarization in 2 − 4 keV, and 3.2% in 4 − 8 keV. Typical of the spectra seen in NS-LMXBs, we find that a combination of soft thermal emission from the accretion disc and Comptonized component from the optically thick corona produces a good fit to the spectra. We also attempt to infer the individual polarization of these components, and obtain a 3σ upper limit of ∼ 11% on the polarization degree of the thermal component, and constrain that of the Comptonized component to ∼ 3%. We comment on the possible corona geometry of the system based on our results.

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Section: Introductionmentioning

confidence: 99%