Mapping Cassiopeia A's silicon/sulfur Doppler velocities with XRISM-Resolve
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916725884190720 |
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| author | Vink, Jacco Agarwal, Manan Bamba, Aya Gu, Liyi Plucinsky, Paul Behar, Ehud Corrales, Lia Foster, Adam Fujimoto, Shin-ichiro Ichihashi, Masahiro Ichikawa, Kazuhiro Katsuda, Satoru Matsumoto, Hironori Matsunaga, Kai Mizuno, Tsunefumi Mori, Koji Murakami, Hiroshi Nakajima, Hiroshi Sato, Toshiki Sawada, Makoto Sonoda, Haruto Suzuki, Shunsuke Tateishi, Dai Terada, Yukikatsu Uchida, Hiroyuki |
| author_facet | Vink, Jacco Agarwal, Manan Bamba, Aya Gu, Liyi Plucinsky, Paul Behar, Ehud Corrales, Lia Foster, Adam Fujimoto, Shin-ichiro Ichihashi, Masahiro Ichikawa, Kazuhiro Katsuda, Satoru Matsumoto, Hironori Matsunaga, Kai Mizuno, Tsunefumi Mori, Koji Murakami, Hiroshi Nakajima, Hiroshi Sato, Toshiki Sawada, Makoto Sonoda, Haruto Suzuki, Shunsuke Tateishi, Dai Terada, Yukikatsu Uchida, Hiroyuki |
| contents | Young supernova remnants (SNRs) provide crucial insights into explosive nucleosynthesis products and their velocity distribution soon after the explosion. However, these velocities are influenced by the dynamics of the circumstellar medium (CSM), which originates from the progenitor's late-phase mass loss. Cas A, the youngest known Galactic core-collapse SNR, was studied to analyze the spatial distribution of Si and S radial velocities using two high-spectral resolution observations from the XRISM-Resolve imaging spectrometer.Resolve's capabilities enabled the detailed characterization of Si XIII, Si XIV, S XV, and S XVI lines, whose line shapes can be resolved and modeled using Gaussian radial-velocity components. The radial velocities measured generally align with previous CCD-based results, confirming that they were not artifacts caused by blended lines or ionization variations. Modeling line profiles with two-component Gaussians improved fits in some regions, revealing distinct redshifted (backside) and blueshifted (frontside) components only in a few specific areas. In most regions, however, both components were either both redshifted (northwest) or both blueshifted (southeast), consistent with the patchy ejecta shell morphology seen in optically emitting fast-moving knots. The individual line components revealed a line broadening ranging from $σ_v \approx 200$ to $σ_v \approx 2000$ km/s. Components with $1000 \lesssim σ_v \lesssim 2000$km/s are consistent with previously determined reverse shock velocities, suggesting non-equilibrated or partially equilibrated ion temperatures. Narrow components with small radial velocities found near Cas A's projected center likely originate from shocked CSM plasma. But the low radial velocity and small $σ_v$ defies identifying these components with either the frontside or backside of the SNR, or both. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_04691 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mapping Cassiopeia A's silicon/sulfur Doppler velocities with XRISM-Resolve Vink, Jacco Agarwal, Manan Bamba, Aya Gu, Liyi Plucinsky, Paul Behar, Ehud Corrales, Lia Foster, Adam Fujimoto, Shin-ichiro Ichihashi, Masahiro Ichikawa, Kazuhiro Katsuda, Satoru Matsumoto, Hironori Matsunaga, Kai Mizuno, Tsunefumi Mori, Koji Murakami, Hiroshi Nakajima, Hiroshi Sato, Toshiki Sawada, Makoto Sonoda, Haruto Suzuki, Shunsuke Tateishi, Dai Terada, Yukikatsu Uchida, Hiroyuki High Energy Astrophysical Phenomena Young supernova remnants (SNRs) provide crucial insights into explosive nucleosynthesis products and their velocity distribution soon after the explosion. However, these velocities are influenced by the dynamics of the circumstellar medium (CSM), which originates from the progenitor's late-phase mass loss. Cas A, the youngest known Galactic core-collapse SNR, was studied to analyze the spatial distribution of Si and S radial velocities using two high-spectral resolution observations from the XRISM-Resolve imaging spectrometer.Resolve's capabilities enabled the detailed characterization of Si XIII, Si XIV, S XV, and S XVI lines, whose line shapes can be resolved and modeled using Gaussian radial-velocity components. The radial velocities measured generally align with previous CCD-based results, confirming that they were not artifacts caused by blended lines or ionization variations. Modeling line profiles with two-component Gaussians improved fits in some regions, revealing distinct redshifted (backside) and blueshifted (frontside) components only in a few specific areas. In most regions, however, both components were either both redshifted (northwest) or both blueshifted (southeast), consistent with the patchy ejecta shell morphology seen in optically emitting fast-moving knots. The individual line components revealed a line broadening ranging from $σ_v \approx 200$ to $σ_v \approx 2000$ km/s. Components with $1000 \lesssim σ_v \lesssim 2000$km/s are consistent with previously determined reverse shock velocities, suggesting non-equilibrated or partially equilibrated ion temperatures. Narrow components with small radial velocities found near Cas A's projected center likely originate from shocked CSM plasma. But the low radial velocity and small $σ_v$ defies identifying these components with either the frontside or backside of the SNR, or both. |
| title | Mapping Cassiopeia A's silicon/sulfur Doppler velocities with XRISM-Resolve |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2505.04691 |