XRISM Spectroscopy of the Stellar-Mass Black Hole 4U 1630-472 in Outburst
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Miller, Jon M. Mizumoto, Misaki Shidatsu, Megumi Ballhausen, Ralf Behar, Ehud Trigo, Maria Diaz Done, Chris Dotani, Tadayasu Garcia, Javier Kallman, Timothy Kobayashi, Shogo B. Kubota, Aya Smith, Randall Takahashi, Hiromitsu Tashiro, Makoto Ueda, Yoshihiro Vink, Jacco Yamada, Shinya Watanabe, Shin Iizuka, Ryo Terada, Yukikatsu Baluta, Chris Kanemaru, Yoshiaki Ogawa, Shoji Yoshida, Tessei Hayashi, Katsuhiro |
| author_facet | Miller, Jon M. Mizumoto, Misaki Shidatsu, Megumi Ballhausen, Ralf Behar, Ehud Trigo, Maria Diaz Done, Chris Dotani, Tadayasu Garcia, Javier Kallman, Timothy Kobayashi, Shogo B. Kubota, Aya Smith, Randall Takahashi, Hiromitsu Tashiro, Makoto Ueda, Yoshihiro Vink, Jacco Yamada, Shinya Watanabe, Shin Iizuka, Ryo Terada, Yukikatsu Baluta, Chris Kanemaru, Yoshiaki Ogawa, Shoji Yoshida, Tessei Hayashi, Katsuhiro |
| contents | We report on XRISM/Resolve spectroscopy of the recurrent transient and well-known black hole candidate 4U 1630$-$472 during its 2024 outburst. The source was captured at the end of a disk-dominated high/soft state, at an Eddington fraction of $λ_\mathrm{Edd} \sim 0.05~(10 M_{\odot}/M_\mathrm{BH})$. A variable absorption spectrum with unprecedented complexity is revealed with the Resolve calorimeter. This marks one of the lowest Eddington fractions at which highly ionized absorption has been detected in an X-ray binary. The strongest lines are fully resolved, with He-like Fe XXV separated into resonance and intercombination components, and H-like Fe XXVI seen as a spin-orbit doublet. The depth of some absorption lines varied by almost an order of magnitude, far more than expected based on a 10% variation in apparent X-ray flux and ionization parameter. The velocity of some absorption components also changed significantly. Jointly modeling two flux segments with a consistent model including four photoionization zones, the spectrum can be described in terms of highly ionized but likely failed winds that sometimes show red-shifts, variable obscuration that may signal asymmetric structures in the middle and outer accretion disk, and a tentative very fast outflow ($v = 0.026-0.033c$). We discuss the impact of these findings on our understanding of accretion and winds in stellar-mass black holes, and potential consequences for future studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_07319 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | XRISM Spectroscopy of the Stellar-Mass Black Hole 4U 1630-472 in Outburst Miller, Jon M. Mizumoto, Misaki Shidatsu, Megumi Ballhausen, Ralf Behar, Ehud Trigo, Maria Diaz Done, Chris Dotani, Tadayasu Garcia, Javier Kallman, Timothy Kobayashi, Shogo B. Kubota, Aya Smith, Randall Takahashi, Hiromitsu Tashiro, Makoto Ueda, Yoshihiro Vink, Jacco Yamada, Shinya Watanabe, Shin Iizuka, Ryo Terada, Yukikatsu Baluta, Chris Kanemaru, Yoshiaki Ogawa, Shoji Yoshida, Tessei Hayashi, Katsuhiro High Energy Astrophysical Phenomena We report on XRISM/Resolve spectroscopy of the recurrent transient and well-known black hole candidate 4U 1630$-$472 during its 2024 outburst. The source was captured at the end of a disk-dominated high/soft state, at an Eddington fraction of $λ_\mathrm{Edd} \sim 0.05~(10 M_{\odot}/M_\mathrm{BH})$. A variable absorption spectrum with unprecedented complexity is revealed with the Resolve calorimeter. This marks one of the lowest Eddington fractions at which highly ionized absorption has been detected in an X-ray binary. The strongest lines are fully resolved, with He-like Fe XXV separated into resonance and intercombination components, and H-like Fe XXVI seen as a spin-orbit doublet. The depth of some absorption lines varied by almost an order of magnitude, far more than expected based on a 10% variation in apparent X-ray flux and ionization parameter. The velocity of some absorption components also changed significantly. Jointly modeling two flux segments with a consistent model including four photoionization zones, the spectrum can be described in terms of highly ionized but likely failed winds that sometimes show red-shifts, variable obscuration that may signal asymmetric structures in the middle and outer accretion disk, and a tentative very fast outflow ($v = 0.026-0.033c$). We discuss the impact of these findings on our understanding of accretion and winds in stellar-mass black holes, and potential consequences for future studies. |
| title | XRISM Spectroscopy of the Stellar-Mass Black Hole 4U 1630-472 in Outburst |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2506.07319 |