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X-Ray Polarized View on the Accretion Geometry in the X-Ray Binary Circinus X-1

Fuente: arXiv

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Auteurs principaux:	Rankin, John, La Monaca, Fabio, Di Marco, Alessandro, Poutanen, Juri, Bobrikova, Anna, Kravtsov, Vadim, Muleri, Fabio, Pilia, Maura, Veledina, Alexandra, Fender, Rob, Kaaret, Philip, Kim, Dawoon E., Marinucci, Andrea, Marshall, Herman L., Papitto, Alessandro, Tennant, Allyn F., Tsygankov, Sergey S., Weisskopf, Martin C., Wu, Kinwah, Zane, Silvia, Ambrosino, Filippo, Farinelli, Ruben, Gnarini, Andrea, Agudo, Iván, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolò, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Costa, Enrico, De Rosa, Alessandra, Del Monte, Ettore, Di Gesu, Laura, di Lalla, Niccolò, Donnarumma, Immacolata, Doroshenko, Victor, Dovčiak, Michal, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Garcia, Javier A., Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Iwakiri, Wataru, Jorstad, Svetlana G., Karas, Vladimir, Kislat, Fabian, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Krawczynski, Henric, Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marin, Frédéric, Marscher, Alan P., Massaro, Francesco, Matt, Giorgio, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Negro, Michela, Ng, Chi-Yung, O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Petrucci, Pierre-Olivier, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Ratheesh, Ajay, Roberts, Oliver J., Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Soffitta, Paolo, Spandre, Gloria, Swartz, Douglas A., Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Thomas, Nicholas E., Tombesi, Francesco, Trois, Alessio, Turolla, Roberto, Vink, Jacco, Xie, Fei
Format:	Preprint
Publié:	2023
Sujets:	High Energy Astrophysical Phenomena
Accès en ligne:	Acceder al recurso
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_version_	1866929231412330496
author	Rankin, John La Monaca, Fabio Di Marco, Alessandro Poutanen, Juri Bobrikova, Anna Kravtsov, Vadim Muleri, Fabio Pilia, Maura Veledina, Alexandra Fender, Rob Kaaret, Philip Kim, Dawoon E. Marinucci, Andrea Marshall, Herman L. Papitto, Alessandro Tennant, Allyn F. Tsygankov, Sergey S. Weisskopf, Martin C. Wu, Kinwah Zane, Silvia Ambrosino, Filippo Farinelli, Ruben Gnarini, Andrea Agudo, Iván Antonelli, Lucio A. Bachetti, Matteo Baldini, Luca Baumgartner, Wayne H. Bellazzini, Ronaldo Bianchi, Stefano Bongiorno, Stephen D. Bonino, Raffaella Brez, Alessandro Bucciantini, Niccolò Capitanio, Fiamma Castellano, Simone Cavazzuti, Elisabetta Chen, Chien-Ting Ciprini, Stefano Costa, Enrico De Rosa, Alessandra Del Monte, Ettore Di Gesu, Laura di Lalla, Niccolò Donnarumma, Immacolata Doroshenko, Victor Dovčiak, Michal Ehlert, Steven R. Enoto, Teruaki Evangelista, Yuri Fabiani, Sergio Ferrazzoli, Riccardo Garcia, Javier A. Gunji, Shuichi Hayashida, Kiyoshi Heyl, Jeremy Iwakiri, Wataru Jorstad, Svetlana G. Karas, Vladimir Kislat, Fabian Kitaguchi, Takao Kolodziejczak, Jeffery J. Krawczynski, Henric Latronico, Luca Liodakis, Ioannis Maldera, Simone Manfreda, Alberto Marin, Frédéric Marscher, Alan P. Massaro, Francesco Matt, Giorgio Mitsuishi, Ikuyuki Mizuno, Tsunefumi Negro, Michela Ng, Chi-Yung O'Dell, Stephen L. Omodei, Nicola Oppedisano, Chiara Pavlov, George G. Peirson, Abel L. Perri, Matteo Pesce-Rollins, Melissa Petrucci, Pierre-Olivier Possenti, Andrea Puccetti, Simonetta Ramsey, Brian D. Ratheesh, Ajay Roberts, Oliver J. Romani, Roger W. Sgrò, Carmelo Slane, Patrick Soffitta, Paolo Spandre, Gloria Swartz, Douglas A. Tamagawa, Toru Tavecchio, Fabrizio Taverna, Roberto Tawara, Yuzuru Thomas, Nicholas E. Tombesi, Francesco Trois, Alessio Turolla, Roberto Vink, Jacco Xie, Fei
author_facet	Rankin, John La Monaca, Fabio Di Marco, Alessandro Poutanen, Juri Bobrikova, Anna Kravtsov, Vadim Muleri, Fabio Pilia, Maura Veledina, Alexandra Fender, Rob Kaaret, Philip Kim, Dawoon E. Marinucci, Andrea Marshall, Herman L. Papitto, Alessandro Tennant, Allyn F. Tsygankov, Sergey S. Weisskopf, Martin C. Wu, Kinwah Zane, Silvia Ambrosino, Filippo Farinelli, Ruben Gnarini, Andrea Agudo, Iván Antonelli, Lucio A. Bachetti, Matteo Baldini, Luca Baumgartner, Wayne H. Bellazzini, Ronaldo Bianchi, Stefano Bongiorno, Stephen D. Bonino, Raffaella Brez, Alessandro Bucciantini, Niccolò Capitanio, Fiamma Castellano, Simone Cavazzuti, Elisabetta Chen, Chien-Ting Ciprini, Stefano Costa, Enrico De Rosa, Alessandra Del Monte, Ettore Di Gesu, Laura di Lalla, Niccolò Donnarumma, Immacolata Doroshenko, Victor Dovčiak, Michal Ehlert, Steven R. Enoto, Teruaki Evangelista, Yuri Fabiani, Sergio Ferrazzoli, Riccardo Garcia, Javier A. Gunji, Shuichi Hayashida, Kiyoshi Heyl, Jeremy Iwakiri, Wataru Jorstad, Svetlana G. Karas, Vladimir Kislat, Fabian Kitaguchi, Takao Kolodziejczak, Jeffery J. Krawczynski, Henric Latronico, Luca Liodakis, Ioannis Maldera, Simone Manfreda, Alberto Marin, Frédéric Marscher, Alan P. Massaro, Francesco Matt, Giorgio Mitsuishi, Ikuyuki Mizuno, Tsunefumi Negro, Michela Ng, Chi-Yung O'Dell, Stephen L. Omodei, Nicola Oppedisano, Chiara Pavlov, George G. Peirson, Abel L. Perri, Matteo Pesce-Rollins, Melissa Petrucci, Pierre-Olivier Possenti, Andrea Puccetti, Simonetta Ramsey, Brian D. Ratheesh, Ajay Roberts, Oliver J. Romani, Roger W. Sgrò, Carmelo Slane, Patrick Soffitta, Paolo Spandre, Gloria Swartz, Douglas A. Tamagawa, Toru Tavecchio, Fabrizio Taverna, Roberto Tawara, Yuzuru Thomas, Nicholas E. Tombesi, Francesco Trois, Alessio Turolla, Roberto Vink, Jacco Xie, Fei
contents	Cir X-1 is a neutron star X-ray binary characterized by strong variations in flux during its eccentric $\sim$16.6 days orbit. There are also strong variations in the spectral state, and historically it has shown both atoll and Z state properties. We observed the source with the Imaging X-ray Polarimetry Explorer during two orbital segments, 6 days apart, for a total of 263~ks. We find an X-ray polarization degree in these segments of $1.6\%\pm0.3\%$ and $1.4\%\pm0.3\%$ at polarization angles of $37^\circ\pm5^\circ$ and $-12^\circ\pm7^\circ$, respectively. Thus we observed a rotation of the polarization angle by $49^\circ\pm8^\circ$ along the orbit. Because variations of accretion flow, and then of the hardness ratio, are expected during the orbit, we also studied the polarization binned in hardness ratio, and found the polarization angle differing by $67^\circ\pm11^\circ$ between the lowest and highest values of the hardness ratio. We discuss possible interpretations of this result that could indicate a possible misalignment between the symmetry axes of the accretion disk and the Comptonizing region caused by the misalignment of the neutron star's angular momentum with respect to the orbital one.
format	Preprint
id	arxiv_https___arxiv_org_abs_2311_04632
institution	arXiv
publishDate	2023
record_format	arxiv
spellingShingle	X-Ray Polarized View on the Accretion Geometry in the X-Ray Binary Circinus X-1 Rankin, John La Monaca, Fabio Di Marco, Alessandro Poutanen, Juri Bobrikova, Anna Kravtsov, Vadim Muleri, Fabio Pilia, Maura Veledina, Alexandra Fender, Rob Kaaret, Philip Kim, Dawoon E. Marinucci, Andrea Marshall, Herman L. Papitto, Alessandro Tennant, Allyn F. Tsygankov, Sergey S. Weisskopf, Martin C. Wu, Kinwah Zane, Silvia Ambrosino, Filippo Farinelli, Ruben Gnarini, Andrea Agudo, Iván Antonelli, Lucio A. Bachetti, Matteo Baldini, Luca Baumgartner, Wayne H. Bellazzini, Ronaldo Bianchi, Stefano Bongiorno, Stephen D. Bonino, Raffaella Brez, Alessandro Bucciantini, Niccolò Capitanio, Fiamma Castellano, Simone Cavazzuti, Elisabetta Chen, Chien-Ting Ciprini, Stefano Costa, Enrico De Rosa, Alessandra Del Monte, Ettore Di Gesu, Laura di Lalla, Niccolò Donnarumma, Immacolata Doroshenko, Victor Dovčiak, Michal Ehlert, Steven R. Enoto, Teruaki Evangelista, Yuri Fabiani, Sergio Ferrazzoli, Riccardo Garcia, Javier A. Gunji, Shuichi Hayashida, Kiyoshi Heyl, Jeremy Iwakiri, Wataru Jorstad, Svetlana G. Karas, Vladimir Kislat, Fabian Kitaguchi, Takao Kolodziejczak, Jeffery J. Krawczynski, Henric Latronico, Luca Liodakis, Ioannis Maldera, Simone Manfreda, Alberto Marin, Frédéric Marscher, Alan P. Massaro, Francesco Matt, Giorgio Mitsuishi, Ikuyuki Mizuno, Tsunefumi Negro, Michela Ng, Chi-Yung O'Dell, Stephen L. Omodei, Nicola Oppedisano, Chiara Pavlov, George G. Peirson, Abel L. Perri, Matteo Pesce-Rollins, Melissa Petrucci, Pierre-Olivier Possenti, Andrea Puccetti, Simonetta Ramsey, Brian D. Ratheesh, Ajay Roberts, Oliver J. Romani, Roger W. Sgrò, Carmelo Slane, Patrick Soffitta, Paolo Spandre, Gloria Swartz, Douglas A. Tamagawa, Toru Tavecchio, Fabrizio Taverna, Roberto Tawara, Yuzuru Thomas, Nicholas E. Tombesi, Francesco Trois, Alessio Turolla, Roberto Vink, Jacco Xie, Fei High Energy Astrophysical Phenomena Cir X-1 is a neutron star X-ray binary characterized by strong variations in flux during its eccentric $\sim$16.6 days orbit. There are also strong variations in the spectral state, and historically it has shown both atoll and Z state properties. We observed the source with the Imaging X-ray Polarimetry Explorer during two orbital segments, 6 days apart, for a total of 263~ks. We find an X-ray polarization degree in these segments of $1.6\%\pm0.3\%$ and $1.4\%\pm0.3\%$ at polarization angles of $37^\circ\pm5^\circ$ and $-12^\circ\pm7^\circ$, respectively. Thus we observed a rotation of the polarization angle by $49^\circ\pm8^\circ$ along the orbit. Because variations of accretion flow, and then of the hardness ratio, are expected during the orbit, we also studied the polarization binned in hardness ratio, and found the polarization angle differing by $67^\circ\pm11^\circ$ between the lowest and highest values of the hardness ratio. We discuss possible interpretations of this result that could indicate a possible misalignment between the symmetry axes of the accretion disk and the Comptonizing region caused by the misalignment of the neutron star's angular momentum with respect to the orbital one.
title	X-Ray Polarized View on the Accretion Geometry in the X-Ray Binary Circinus X-1
topic	High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2311.04632