XL-Calibur Polarimetry of Cyg X-1 Further Constrains the Origin of its Hard-state X-ray Emission
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| Natura: | Preprint |
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2025
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| author | Awaki, Hisamitsu Baring, Matthew G. Bose, Richard Casey, Jacob Chun, Sohee Dasgupta, Adrika Galchenko, Pavel Gau, Ephraim Goya, Kazuho Hakamata, Tomohiro Hayashi, Takayuki Heatwole, Scott Hu, Kun Ishi, Daiki Ishida, Manabu Kislat, Fabian Kiss, Mózsi Klepper, Kassi Krawczynski, Henric Kuramoto, Haruki Lisalda, Lindsey Maeda, Yoshitomo Matsumoto, Hironori Menon, Shravan Vengalil Miyamoto, Aiko Miyamoto, Asca Murakami, Kaito Okajima, Takashi Pearce, Mark Rauch, Brian Cavero, Nicole Rodriguez Shirahama, Kentaro Spooner, Sean Takahashi, Hiromitsu Tamura, Keisuke Uchida, Yuusuke Wimalasena, Kasun Yokota, Masato Yoshimoto, Marina |
| author_facet | Awaki, Hisamitsu Baring, Matthew G. Bose, Richard Casey, Jacob Chun, Sohee Dasgupta, Adrika Galchenko, Pavel Gau, Ephraim Goya, Kazuho Hakamata, Tomohiro Hayashi, Takayuki Heatwole, Scott Hu, Kun Ishi, Daiki Ishida, Manabu Kislat, Fabian Kiss, Mózsi Klepper, Kassi Krawczynski, Henric Kuramoto, Haruki Lisalda, Lindsey Maeda, Yoshitomo Matsumoto, Hironori Menon, Shravan Vengalil Miyamoto, Aiko Miyamoto, Asca Murakami, Kaito Okajima, Takashi Pearce, Mark Rauch, Brian Cavero, Nicole Rodriguez Shirahama, Kentaro Spooner, Sean Takahashi, Hiromitsu Tamura, Keisuke Uchida, Yuusuke Wimalasena, Kasun Yokota, Masato Yoshimoto, Marina |
| contents | The balloon-borne hard X-ray polarimetry mission XL-Calibur observed the Black Hole X-ray Binary (BHXRB) Cygnus X-1 (Cyg X-1) during its nearly six-day Long Duration Balloon (LDB) flight from Sweden to Canada in July 2024. The XL-Calibur observations allowed us to derive the most precise constraints to date of the Polarization Degree (PD) and Polarization Angle (PA) of the hard X-ray emission from a BHXRB. XL-Calibur observed Cyg X-1 in the hard state and measured a $\sim$19-64 keV PD of ($5.0^{+2.7}_{-3.0}$)% at a PA of $-28^{\circ}\pm 17^{\circ}$, with an 8.7% chance probability of detecting larger PDs than the one observed, given an unpolarized signal. The XL-Calibur results are thus comparable to the 2-8 keV PD and PA found by IXPE, with a similar agreement between the hard X-ray PA and the radio jet direction. We also discuss the implications of our polarization measurements in the context of models describing the origin of the broadband X-ray and $γ$-ray emission, to which XL-Calibur provides independent constraints on any proposed emission modeling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_23126 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | XL-Calibur Polarimetry of Cyg X-1 Further Constrains the Origin of its Hard-state X-ray Emission Awaki, Hisamitsu Baring, Matthew G. Bose, Richard Casey, Jacob Chun, Sohee Dasgupta, Adrika Galchenko, Pavel Gau, Ephraim Goya, Kazuho Hakamata, Tomohiro Hayashi, Takayuki Heatwole, Scott Hu, Kun Ishi, Daiki Ishida, Manabu Kislat, Fabian Kiss, Mózsi Klepper, Kassi Krawczynski, Henric Kuramoto, Haruki Lisalda, Lindsey Maeda, Yoshitomo Matsumoto, Hironori Menon, Shravan Vengalil Miyamoto, Aiko Miyamoto, Asca Murakami, Kaito Okajima, Takashi Pearce, Mark Rauch, Brian Cavero, Nicole Rodriguez Shirahama, Kentaro Spooner, Sean Takahashi, Hiromitsu Tamura, Keisuke Uchida, Yuusuke Wimalasena, Kasun Yokota, Masato Yoshimoto, Marina High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics The balloon-borne hard X-ray polarimetry mission XL-Calibur observed the Black Hole X-ray Binary (BHXRB) Cygnus X-1 (Cyg X-1) during its nearly six-day Long Duration Balloon (LDB) flight from Sweden to Canada in July 2024. The XL-Calibur observations allowed us to derive the most precise constraints to date of the Polarization Degree (PD) and Polarization Angle (PA) of the hard X-ray emission from a BHXRB. XL-Calibur observed Cyg X-1 in the hard state and measured a $\sim$19-64 keV PD of ($5.0^{+2.7}_{-3.0}$)% at a PA of $-28^{\circ}\pm 17^{\circ}$, with an 8.7% chance probability of detecting larger PDs than the one observed, given an unpolarized signal. The XL-Calibur results are thus comparable to the 2-8 keV PD and PA found by IXPE, with a similar agreement between the hard X-ray PA and the radio jet direction. We also discuss the implications of our polarization measurements in the context of models describing the origin of the broadband X-ray and $γ$-ray emission, to which XL-Calibur provides independent constraints on any proposed emission modeling. |
| title | XL-Calibur Polarimetry of Cyg X-1 Further Constrains the Origin of its Hard-state X-ray Emission |
| topic | High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2507.23126 |