Dynamics of the intermediate-mass-element ejecta in the supernova remnant Cassiopeia A studied with XRISM Article Swipe
Shunsuke Suzuki
,
Hidetaka Sonoda
,
Yusuke Sakai
,
Yuken Ohshiro
,
S. Yamada
,
Manan Agarwal
,
Satoru Katsuda
,
Hiroya Yamaguchi
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1093/pasj/psaf040
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1093/pasj/psaf040
Supernova remnants (SNRs) provide crucial information on the still poorly understood mechanism of supernova explosion. Here we present XRISM high-resolution spectroscopy of the intermediate-mass-element (IME) ejecta in the SNR Cas A to determine their velocity distribution and thermal properties. The XRISM/Resolve spectrum in the 1.75–2.95 keV band extracted from each $1^{\prime } \times 1^{\prime }$ region in the south-east and north-west rims is fitted with a model consisting of two-component plasmas in non-equilibrium ionization with different radial velocities and ionization timescales. It is found that the more highly ionized component has a larger radial velocity, suggesting that this component is distributed in the outer layer and thus has been heated by the SNR reverse shock earlier. We also perform proper motion measurement of the highly ionized component (represented by the Si xiv Ly$\alpha$ emission), using archival Chandra data, to reconstruct the three-dimensional velocity of the outermost IME ejecta. The pre-shock (free expansion) velocity of these ejecta is estimated to range from 2400 to 7100 km s$^{-1}$, based on the thermal properties and the bulk velocity of the shocked ejecta. These velocities are consistent with theoretical predictions for a Type IIb supernova, in which the progenitor’s hydrogen envelope is largely stripped before the explosion. Furthermore, we find a substantial asymmetry in the distribution of the free expansion velocities, with the highest value toward the direction opposite to the proper motion of the neutron star (NS). This indicates a physical association between the asymmetric supernova explosion and NS kick.
Related Topics
Concepts
Cassiopeia A
Physics
Ejecta
Supernova
Supernova remnant
Astrophysics
Astronomy
Dynamics (music)
Near-Earth supernova
Element (criminal law)
Law
Political science
Acoustics
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/pasj/psaf040
- https://academic.oup.com/pasj/advance-article-pdf/doi/10.1093/pasj/psaf040/63393996/psaf040.pdf
- OA Status
- hybrid
- Cited By
- 1
- References
- 61
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4410795803
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4410795803Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1093/pasj/psaf040Digital Object Identifier
- Title
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Dynamics of the intermediate-mass-element ejecta in the supernova remnant Cassiopeia A studied with XRISMWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
-
2025Year of publication
- Publication date
-
2025-04-07Full publication date if available
- Authors
-
Shunsuke Suzuki, Hidetaka Sonoda, Yusuke Sakai, Yuken Ohshiro, S. Yamada, Manan Agarwal, Satoru Katsuda, Hiroya YamaguchiList of authors in order
- Landing page
-
https://doi.org/10.1093/pasj/psaf040Publisher landing page
- PDF URL
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https://academic.oup.com/pasj/advance-article-pdf/doi/10.1093/pasj/psaf040/63393996/psaf040.pdfDirect link to full text PDF
- Open access
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YesWhether a free full text is available
- OA status
-
hybridOpen access status per OpenAlex
- OA URL
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https://academic.oup.com/pasj/advance-article-pdf/doi/10.1093/pasj/psaf040/63393996/psaf040.pdfDirect OA link when available
- Concepts
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Cassiopeia A, Physics, Ejecta, Supernova, Supernova remnant, Astrophysics, Astronomy, Dynamics (music), Near-Earth supernova, Element (criminal law), Law, Political science, AcousticsTop concepts (fields/topics) attached by OpenAlex
- Cited by
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1Total citation count in OpenAlex
- Citations by year (recent)
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2025: 1Per-year citation counts (last 5 years)
- References (count)
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61Number of works referenced by this work
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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