학술논문
Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1
Document Type
article
Author
Fabio La Monaca; Alessandro Di Marco; Juri Poutanen; Matteo Bachetti; Sara Elisa Motta; Alessandro Papitto; Maura Pilia; Fei Xie; Stefano Bianchi; Anna Bobrikova; Enrico Costa; Wei Deng; Ming-Yu Ge; Giulia Illiano; Shu-Mei Jia; Henric Krawczynski; Eleonora Veronica Lai; Kuan Liu; Guglielmo Mastroserio; Fabio Muleri; John Rankin; Paolo Soffitta; Alexandra Veledina; Filippo Ambrosino; Melania Del Santo; Wei Chen; Javier A. Garcia; Philip Kaaret; Thomas D. Russell; Wen-Hao Wei; Shuang-Nan Zhang; Chao Zuo; Zaven Arzoumanian; Massimo Cocchi; Andrea Gnarini; Ruben Farinelli; Keith Gendreau; Francesco Ursini; Martin C. Weisskopf; Silvia Zane; Iván Agudo; Lucio A. Antonelli; Luca Baldini; Wayne H. Baumgartner; Ronaldo Bellazzini; Stephen D. Bongiorno; Raffaella Bonino; Alessandro Brez; Niccolò Bucciantini; Fiamma Capitanio; Simone Castellano; Elisabetta Cavazzuti; Chien-Ting Chen; Stefano Ciprini; Alessandra De Rosa; Ettore Del Monte; Laura Di Gesu; Niccolò Di Lalla; Immacolata Donnarumma; Victor Doroshenko; Michal Dovčiak; Steven R. Ehlert; Teruaki Enoto; Yuri Evangelista; Sergio Fabiani; Riccardo Ferrazzoli; Shuichi Gunji; Kiyoshi Hayashida; Jeremy Heyl; Wataru Iwakiri; Svetlana G. Jorstad; Vladimir Karas; Fabian Kislat; Takao Kitaguchi; Jeffery J. Kolodziejczak; Luca Latronico; Ioannis Liodakis; Simone Maldera; Alberto Manfreda; Frédéric Marin; Andrea Marinucci; Alan P. Marscher; Herman L. Marshall; Francesco Massaro; Giorgio Matt; Ikuyuki Mitsuishi; Tsunefumi Mizuno; Michela Negro; Chi-Yung Ng; Stephen L. O’Dell; Nicola Omodei; Chiara Oppedisano; George G. Pavlov; Abel L. Peirson; Matteo Perri; Melissa Pesce-Rollins; Pierre-Olivier Petrucci; Andrea Possenti; Simonetta Puccetti; Brian D. Ramsey; Ajay Ratheesh; Oliver J. Roberts; Roger W. Romani; Carmelo Sgrò; Patrick Slane; Gloria Spandre; Douglas A. Swartz; Toru Tamagawa; Fabrizio Tavecchio; Roberto Taverna; Yuzuru Tawara; Allyn F. Tennant; Nicholas E. Thomas; Francesco Tombesi; Alessio Trois; Sergey S. Tsygankov; Roberto Turolla; Jacco Vink; Kinwah Wu; IXPE Collaboration
Source
The Astrophysical Journal Letters, Vol 960, Iss 2, p L11 (2024)
Subject
Language
English
ISSN
2041-8213
2041-8205
2041-8205
Abstract
The Imaging X-ray Polarimetry Explorer measured with high significance the X-ray polarization of the brightest Z-source, Sco X-1, resulting in the nominal 2–8 keV energy band in a polarization degree of 1.0% ± 0.2% and a polarization angle of 8° ± 6° at a 90% confidence level. This observation was strictly simultaneous with observations performed by NICER, NuSTAR, and Insight-HXMT, which allowed for a precise characterization of its broadband spectrum from soft to hard X-rays. The source has been observed mainly in its soft state, with short periods of flaring. We also observed low-frequency quasiperiodic oscillations. From a spectropolarimetric analysis, we associate a polarization to the accretion disk at