A XRISM View of Relativistic Reflection in Cygnus X-1
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918213484281856 |
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| author | Draghis, Paul A. Miller, Jon M. Kara, Erin Costantini, Elisa Adegoke, Oluwashina Garcia, Javier A. |
| author_facet | Draghis, Paul A. Miller, Jon M. Kara, Erin Costantini, Elisa Adegoke, Oluwashina Garcia, Javier A. |
| contents | We present the first high-resolution XRISM/Resolve view of the relativistically broadened Fe K line in Cygnus X-1. The data clearly separate the relativistic broad line from the underlying continuum and from narrow emission and absorption features in the Fe band. The unprecedented spectral resolution in the Fe K band clearly demonstrates that the flux excess can be attributed to a single, broad feature, as opposed to a superposition of previously unresolved narrow features. This broad feature can be best interpreted as emission consistent with an origin near the innermost stable circular orbit around a rapidly rotating black hole. By modeling the shape of the broad line, we find a black hole spin of $a\simeq0.98$ and an inclination of the inner accretion disk of $θ\simeq63^\circ$. The spin is consistent with prior reflection studies, reaffirming the robustness of past spin measurements using the relativistic reflection method. The measured inclination provides reinforcing evidence of a disk-orbit misalignment in Cygnus X-1. These results highlight the unique abilities of XRISM in separating overlapping spectral features and providing constraints on the geometry of accretion in X-ray binaries. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_17338 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A XRISM View of Relativistic Reflection in Cygnus X-1 Draghis, Paul A. Miller, Jon M. Kara, Erin Costantini, Elisa Adegoke, Oluwashina Garcia, Javier A. High Energy Astrophysical Phenomena We present the first high-resolution XRISM/Resolve view of the relativistically broadened Fe K line in Cygnus X-1. The data clearly separate the relativistic broad line from the underlying continuum and from narrow emission and absorption features in the Fe band. The unprecedented spectral resolution in the Fe K band clearly demonstrates that the flux excess can be attributed to a single, broad feature, as opposed to a superposition of previously unresolved narrow features. This broad feature can be best interpreted as emission consistent with an origin near the innermost stable circular orbit around a rapidly rotating black hole. By modeling the shape of the broad line, we find a black hole spin of $a\simeq0.98$ and an inclination of the inner accretion disk of $θ\simeq63^\circ$. The spin is consistent with prior reflection studies, reaffirming the robustness of past spin measurements using the relativistic reflection method. The measured inclination provides reinforcing evidence of a disk-orbit misalignment in Cygnus X-1. These results highlight the unique abilities of XRISM in separating overlapping spectral features and providing constraints on the geometry of accretion in X-ray binaries. |
| title | A XRISM View of Relativistic Reflection in Cygnus X-1 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2511.17338 |