Polarization properties of the weakly magnetized neutron star X-ray binary GS 1826-238 in the high soft state
Abstract
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 broad-band 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.
Cite
@article{arxiv.2212.12472,
title = {Polarization properties of the weakly magnetized neutron star X-ray binary GS 1826-238 in the high soft state},
author = {Fiamma Capitanio and Sergio Fabiani and Andrea Gnarini and Francesco Ursini and Carlo Ferrigno and Giorgio Matt and Juri Poutanen and Massimo Cocchi and Romana Mikusincova and Ruben Farinelli and Stefano Bianchi and Jari J. E. Kajava and Fabio Muleri and Celia Sanchez-Fernandez and Paolo Soffitta and Kinwah Wu and Ivan Agudo and Lucio A. Antonelli and Matteo Bachetti and Luca Baldini and Wayne H. Baumgartner and Ronaldo Bellazzini and Stephen D. Bongiorno and Raffaella Bonino and Alessandro Brez and Niccoló Bucciantini and Simone Castellano and Elisabetta Cavazzuti and Stefano Ciprini and Enrico Costa and Alessandra De Rosa and Ettore Del Monte and Laura Di Gesu and Niccolo Di Lalla and Alessandro Di Marco and Immacolata Donnarumma and Victor Doroshenko and Michal Dovciak and Steven R. Ehlert and Teruaki Enoto and Yuri Evangelista and Riccardo Ferrazzoli and Javier A. Garcia and Shuichi Gunji and Kiyoshi Hayashida and Jeremy Heyl and Wataru Iwakiri and Svetlana G. Jorstad and Vladimir Karas and Takao Kitaguchi and Jeffery J. Kolodziejczak and Henric Krawczynski and Fabio La Monaca and Luca Latronico and Ioannis Liodakis and Simone Maldera and Alberto Manfreda and Fréedèric Marin and Andrea Marinucci and Alan P. Marscher and Herman L. Marshall and Ikuyuki Mitsuishi and Tsunefumi Mizuno and C. -Y. Ng and Stephen L. O'Dell and Nicola Omodei and Chiara Oppedisano and Alessandro Papitto and George G. Pavlov and Abel L. Peirson and Matteo Perri and Melissa Pesce -Rollins and Pierre-Olivier Petrucci and Maura Pilia and Andrea Possenti and Simonetta Puccetti and Brian D. Ramsey and John Rankin and Ajay Ratheesh and Roger W. Romani and Carmelo Sgrò and Patrick Slane and Gloria Spandre and Toru Tamagawa and Fabrizio Tavecchio and Roberto Taverna and Yuzuru Tawara and Allyn F. Tennant and Nicholas E. Thomas and Francesco Tombesi and Alessio Trois and Sergey S. Tsygankov and Roberto Turolla and Jacco Vink and Martin C. Weisskopf and Fei Xie and Silvia Zane},
journal= {arXiv preprint arXiv:2212.12472},
year = {2023}
}
Comments
Accpted for publication in ApJ