| Project/Area Number |
21K03604
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | Waseda University |
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Principal Investigator |
Motz Holger 早稲田大学, 理工学術院, 教授(任期付) (30647904)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | Cosmic rays / Supernova remnants / CALET / cosmic rays / anisotropy / Vela SNR / High Energy Cosmic Rays / Vela Supernova Remnant / Cosmic Ray Anisotropy / Cosmic Ray Propagation / Cosmic Rays |
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| Outline of Research at the Start |
This project looks for signatures of cosmic-ray acceleration by the Vela supernova remnant in electron and positron cosmic data of the ISS based CALET (Calorimetric Electron Telescope) detector. Finding a signature would be direct evidence for SNRs being the source of electron cosmic rays. Concretely, specific model hypotheses based on simulations are compared to spectral and anisotropy data to narrow down the possible properties of the Vela SNR.
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| Outline of Final Research Achievements |
Galactic cosmic rays (CR) are expected to originate from supernova remnants (SNR), but as charged particles, the magnetic fields scramble their arrival direction which thus does not reveal their sources. But very high energy (TeV-range) electron CR could only arrive at Earth from a few nearby SNR (distance < 1 kpc), since they quickly loose energy.
The ISS-based CALET detector measures the spectrum of all-electron CR up into the TeV region to find signatures of these nearby SNR, specifically the Vela SNR. The theoretical spectral shape in the TeV region was studied and compared to latest results by CALET, revealing a hint for a signature from this nearby SNR.
Towards a significant discovery, improved analysis methods for the spectral and anisotropy signatures (at close distance, the CR directional information may be not completely lost, causing an increased flux from the direction of Vela) have been developed and tested with simulations, confirming that detection is likely by 2030.
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| Academic Significance and Societal Importance of the Research Achievements |
This project paves the road for detecting the first direct observation of cosmic rays from an individual source, the Vela SNR, which would confirm and refine our theoretical understanding of the cosmic rays' origin, leading to a more comprehensive understanding of the universe.
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