Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1
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2023
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| author | La Monaca, Fabio Di Marco, Alessandro Poutanen, Juri Bachetti, Matteo Motta, Sara E. Papitto, Alessandro Pilia, Maura Xie, Fei Bianchi, Stefano Bobrikova, Anna Costa, Enrico Deng, Wei Ge, Mingyu Illiano, Giulia Jia, Shu-Mei Krawczynski, Henric Lai, Eleonora V. Liu, Kuan Mastroserio, Guglielmo Muleri, Fabio Rankin, John Soffitta, Paolo Veledina, Alexandra Ambrosino, Filippo Del Santo, Melania Chen, Wei Garcia, Javier A. Kaaret, Philip Russell, Thomas D. Wei, Wen-Hao Zhang, Shuang-Nan Zuo, Chao Arzoumanian, Zaven Cocchi, Massimo Gnarini, Andrea Farinelli, Ruben Gendreau, Keith C. Ursini, Francesco Weisskopf, Martin C. Zane, Silvia Agudo, Ivan Antonelli, Lucio Angelo Baldini, Luca Baumgartner, Wayne H. Bellazzini, Ronaldo Bongiorno, Stephen D. Bonino, Raffaella Brez, Alessandro Bucciantini, Niccolò Capitanio, Fiamma Castellano, Simone Cavazzuti, Elisabetta Chen, Chien-Ting J. Ciprini, Stefano De Rosa, Alessandra Del Monte, Ettore Di Gesu, Laura Di Lalla, Niccolò Donnarumma, Immacolata Doroshenko, Victor Dovciak, Michal Ehlert, Steven R. Enoto, Teruaki Evangelista, Yuri Fabiani, Sergio Ferrazzoli, Riccardo Gunji, Shuichi Hayashidadag, Kiyoshi Heyl, Jeremy Iwakiri, Wataru Jorstad, Svetlana G. Karas, Vladimir Kislat, Fabian Kitaguchi, Takao Kolodziejczak, Jeffery J. Latronico, Luca Liodakis, Ioannis Maldera, Simone Manfreda, Alberto Marin, Fre'de'ric Marinucci, Andrea Marscher, Alan P. Marshall, Herman L. Massaro, Francesco Matt, Giorgio Mitsuishi, Ikuyuki Mizuno, Tsunefumi Negro, Michela Ng, Stephen Chi-Yung O'Dell, Stephen L. Omodei, Nicola Oppedisano, Chiara Pavlov, George Peirson, Abel L. Perri, Matteo Pesce-Rollins, Melissa Petrucci, Pierre-Olivier Possenti, Andrea Puccetti, Simonetta Ramsey, Brian Ratheesh, Ajay Roberts, Oliver J. Romani, Roger W. Sgrò, Carmelo Slane, Patrick Spandre, Gloria Swartz, Douglas A. Tamagawa, Toru Tavecchio, Fabrizio Taverna, Roberto Tawara, Yuzuru Tennant, Allyn F. Thomas, Nicholas Tombesi, Francesco Trois, Alessio Tsygankov, Sergey S. Turolla, Roberto Vink, Jacco Wu, Kinwah |
| author_facet | La Monaca, Fabio Di Marco, Alessandro Poutanen, Juri Bachetti, Matteo Motta, Sara E. Papitto, Alessandro Pilia, Maura Xie, Fei Bianchi, Stefano Bobrikova, Anna Costa, Enrico Deng, Wei Ge, Mingyu Illiano, Giulia Jia, Shu-Mei Krawczynski, Henric Lai, Eleonora V. Liu, Kuan Mastroserio, Guglielmo Muleri, Fabio Rankin, John Soffitta, Paolo Veledina, Alexandra Ambrosino, Filippo Del Santo, Melania Chen, Wei Garcia, Javier A. Kaaret, Philip Russell, Thomas D. Wei, Wen-Hao Zhang, Shuang-Nan Zuo, Chao Arzoumanian, Zaven Cocchi, Massimo Gnarini, Andrea Farinelli, Ruben Gendreau, Keith C. Ursini, Francesco Weisskopf, Martin C. Zane, Silvia Agudo, Ivan Antonelli, Lucio Angelo Baldini, Luca Baumgartner, Wayne H. Bellazzini, Ronaldo Bongiorno, Stephen D. Bonino, Raffaella Brez, Alessandro Bucciantini, Niccolò Capitanio, Fiamma Castellano, Simone Cavazzuti, Elisabetta Chen, Chien-Ting J. Ciprini, Stefano De Rosa, Alessandra Del Monte, Ettore Di Gesu, Laura Di Lalla, Niccolò Donnarumma, Immacolata Doroshenko, Victor Dovciak, Michal Ehlert, Steven R. Enoto, Teruaki Evangelista, Yuri Fabiani, Sergio Ferrazzoli, Riccardo Gunji, Shuichi Hayashidadag, Kiyoshi Heyl, Jeremy Iwakiri, Wataru Jorstad, Svetlana G. Karas, Vladimir Kislat, Fabian Kitaguchi, Takao Kolodziejczak, Jeffery J. Latronico, Luca Liodakis, Ioannis Maldera, Simone Manfreda, Alberto Marin, Fre'de'ric Marinucci, Andrea Marscher, Alan P. Marshall, Herman L. Massaro, Francesco Matt, Giorgio Mitsuishi, Ikuyuki Mizuno, Tsunefumi Negro, Michela Ng, Stephen Chi-Yung O'Dell, Stephen L. Omodei, Nicola Oppedisano, Chiara Pavlov, George Peirson, Abel L. Perri, Matteo Pesce-Rollins, Melissa Petrucci, Pierre-Olivier Possenti, Andrea Puccetti, Simonetta Ramsey, Brian Ratheesh, Ajay Roberts, Oliver J. Romani, Roger W. Sgrò, Carmelo Slane, Patrick Spandre, Gloria Swartz, Douglas A. Tamagawa, Toru Tavecchio, Fabrizio Taverna, Roberto Tawara, Yuzuru Tennant, Allyn F. Thomas, Nicholas Tombesi, Francesco Trois, Alessio Tsygankov, Sergey S. Turolla, Roberto Vink, Jacco Wu, Kinwah |
| contents | The Imaging X-ray Polarimetry Explorer (IXPE) measured with high significance the X-ray polarization of the brightest Z-source Scorpius 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 90% of confidence level. This observation was strictly simultaneous with observations performed by NICER, NuSTAR, and Insight-HXMT, which allowed for a precise characterization of its broad-band 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 quasi-periodic oscillations. From a spectro-polarimetric analysis, we associate a polarization to the accretion disk at <3.2% at 90% of confidence level, compatible with expectations for an electron-scattering dominated optically thick atmosphere at the Sco X-1 inclination of 44°; for the higher-energy Comptonized component, we obtain a polarization of 1.3(0.4)%, in agreement with expectations for a slab of Thomson optical depth of ~7 and an electron temperature of ~3 keV. A polarization rotation with respect to previous observations by OSO-8 and PolarLight, and also with respect to the radio-jet position angle, is observed. This result may indicate a variation of the polarization with the source state that can be related to relativistic precession or to a change in the corona geometry with the accretion flow. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_06359 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1 La Monaca, Fabio Di Marco, Alessandro Poutanen, Juri Bachetti, Matteo Motta, Sara E. Papitto, Alessandro Pilia, Maura Xie, Fei Bianchi, Stefano Bobrikova, Anna Costa, Enrico Deng, Wei Ge, Mingyu Illiano, Giulia Jia, Shu-Mei Krawczynski, Henric Lai, Eleonora V. Liu, Kuan Mastroserio, Guglielmo Muleri, Fabio Rankin, John Soffitta, Paolo Veledina, Alexandra Ambrosino, Filippo Del Santo, Melania Chen, Wei Garcia, Javier A. Kaaret, Philip Russell, Thomas D. Wei, Wen-Hao Zhang, Shuang-Nan Zuo, Chao Arzoumanian, Zaven Cocchi, Massimo Gnarini, Andrea Farinelli, Ruben Gendreau, Keith C. Ursini, Francesco Weisskopf, Martin C. Zane, Silvia Agudo, Ivan Antonelli, Lucio Angelo Baldini, Luca Baumgartner, Wayne H. Bellazzini, Ronaldo Bongiorno, Stephen D. Bonino, Raffaella Brez, Alessandro Bucciantini, Niccolò Capitanio, Fiamma Castellano, Simone Cavazzuti, Elisabetta Chen, Chien-Ting J. Ciprini, Stefano De Rosa, Alessandra Del Monte, Ettore Di Gesu, Laura Di Lalla, Niccolò Donnarumma, Immacolata Doroshenko, Victor Dovciak, Michal Ehlert, Steven R. Enoto, Teruaki Evangelista, Yuri Fabiani, Sergio Ferrazzoli, Riccardo Gunji, Shuichi Hayashidadag, Kiyoshi Heyl, Jeremy Iwakiri, Wataru Jorstad, Svetlana G. Karas, Vladimir Kislat, Fabian Kitaguchi, Takao Kolodziejczak, Jeffery J. Latronico, Luca Liodakis, Ioannis Maldera, Simone Manfreda, Alberto Marin, Fre'de'ric Marinucci, Andrea Marscher, Alan P. Marshall, Herman L. Massaro, Francesco Matt, Giorgio Mitsuishi, Ikuyuki Mizuno, Tsunefumi Negro, Michela Ng, Stephen Chi-Yung O'Dell, Stephen L. Omodei, Nicola Oppedisano, Chiara Pavlov, George Peirson, Abel L. Perri, Matteo Pesce-Rollins, Melissa Petrucci, Pierre-Olivier Possenti, Andrea Puccetti, Simonetta Ramsey, Brian Ratheesh, Ajay Roberts, Oliver J. Romani, Roger W. Sgrò, Carmelo Slane, Patrick Spandre, Gloria Swartz, Douglas A. Tamagawa, Toru Tavecchio, Fabrizio Taverna, Roberto Tawara, Yuzuru Tennant, Allyn F. Thomas, Nicholas Tombesi, Francesco Trois, Alessio Tsygankov, Sergey S. Turolla, Roberto Vink, Jacco Wu, Kinwah High Energy Astrophysical Phenomena The Imaging X-ray Polarimetry Explorer (IXPE) measured with high significance the X-ray polarization of the brightest Z-source Scorpius 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 90% of confidence level. This observation was strictly simultaneous with observations performed by NICER, NuSTAR, and Insight-HXMT, which allowed for a precise characterization of its broad-band 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 quasi-periodic oscillations. From a spectro-polarimetric analysis, we associate a polarization to the accretion disk at <3.2% at 90% of confidence level, compatible with expectations for an electron-scattering dominated optically thick atmosphere at the Sco X-1 inclination of 44°; for the higher-energy Comptonized component, we obtain a polarization of 1.3(0.4)%, in agreement with expectations for a slab of Thomson optical depth of ~7 and an electron temperature of ~3 keV. A polarization rotation with respect to previous observations by OSO-8 and PolarLight, and also with respect to the radio-jet position angle, is observed. This result may indicate a variation of the polarization with the source state that can be related to relativistic precession or to a change in the corona geometry with the accretion flow. |
| title | Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2311.06359 |