The TeV Spectral Bump of Cosmic-Ray Protons and Helium Nuclei: The Role of Nearby Supernova Remnants
The existence of nearby discrete cosmic-ray (CR) sources can lead to many interesting effects on the observed properties of CRs. Recent measurements of CRs with the CALET and the DAMPE experiments have revealed a bump-like new feature in the proton and helium spectra in the energy range ∼(1–100) TeV...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ade796 |
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| author | Sourav Bhadra Satyendra Thoudam Biman B. Nath Prateek Sharma |
| author_facet | Sourav Bhadra Satyendra Thoudam Biman B. Nath Prateek Sharma |
| author_sort | Sourav Bhadra |
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| description | The existence of nearby discrete cosmic-ray (CR) sources can lead to many interesting effects on the observed properties of CRs. Recent measurements of CRs with the CALET and the DAMPE experiments have revealed a bump-like new feature in the proton and helium spectra in the energy range ∼(1–100) TeV n ^−1 . The origin of the feature is not clearly understood. In this paper, considering an improved and more detailed analysis than previous works, and using updated age and distance estimates of nearby supernova remnants (SNRs) along with an energy-dependent escape process for CRs from the remnants, we show that the spectral bump can be explained by the contribution of CRs from the nearby SNRs, in particular the Vela remnant. We also show that the contribution from the nearby remnants agrees well with the observed spectra of the heavier CR elements from carbon to iron, as well as with the measured all-particle CR spectrum beyond the knee region when combined with a background flux of CRs originating from distant SNRs. |
| format | Article |
| id | doaj-art-12b01f1459bd4eacabd953e9db2caefa |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-12b01f1459bd4eacabd953e9db2caefa2025-08-20T04:00:33ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198917410.3847/1538-4357/ade796The TeV Spectral Bump of Cosmic-Ray Protons and Helium Nuclei: The Role of Nearby Supernova RemnantsSourav Bhadra0https://orcid.org/0000-0002-0044-9751Satyendra Thoudam1https://orcid.org/0000-0002-7066-3614Biman B. Nath2Prateek Sharma3https://orcid.org/0000-0003-2635-4643Raman Research Institute , Sadashiva Nagar, Bangalore 560080, India ; sbhadra07@gmail.com; Department of Physics, Indian Institute of Science , Bangalore 560012, IndiaDepartment of Physics, Khalifa University of Science and Technology , PO Box 127788, Abu Dhabi, United Arab Emirates ; satyendra.thoudam@ku.ac.aeRaman Research Institute , Sadashiva Nagar, Bangalore 560080, India ; sbhadra07@gmail.comDepartment of Physics, Indian Institute of Science , Bangalore 560012, IndiaThe existence of nearby discrete cosmic-ray (CR) sources can lead to many interesting effects on the observed properties of CRs. Recent measurements of CRs with the CALET and the DAMPE experiments have revealed a bump-like new feature in the proton and helium spectra in the energy range ∼(1–100) TeV n ^−1 . The origin of the feature is not clearly understood. In this paper, considering an improved and more detailed analysis than previous works, and using updated age and distance estimates of nearby supernova remnants (SNRs) along with an energy-dependent escape process for CRs from the remnants, we show that the spectral bump can be explained by the contribution of CRs from the nearby SNRs, in particular the Vela remnant. We also show that the contribution from the nearby remnants agrees well with the observed spectra of the heavier CR elements from carbon to iron, as well as with the measured all-particle CR spectrum beyond the knee region when combined with a background flux of CRs originating from distant SNRs.https://doi.org/10.3847/1538-4357/ade796Galactic cosmic raysParticle astrophysicsShocksSupernova remnants |
| spellingShingle | Sourav Bhadra Satyendra Thoudam Biman B. Nath Prateek Sharma The TeV Spectral Bump of Cosmic-Ray Protons and Helium Nuclei: The Role of Nearby Supernova Remnants The Astrophysical Journal Galactic cosmic rays Particle astrophysics Shocks Supernova remnants |
| title | The TeV Spectral Bump of Cosmic-Ray Protons and Helium Nuclei: The Role of Nearby Supernova Remnants |
| title_full | The TeV Spectral Bump of Cosmic-Ray Protons and Helium Nuclei: The Role of Nearby Supernova Remnants |
| title_fullStr | The TeV Spectral Bump of Cosmic-Ray Protons and Helium Nuclei: The Role of Nearby Supernova Remnants |
| title_full_unstemmed | The TeV Spectral Bump of Cosmic-Ray Protons and Helium Nuclei: The Role of Nearby Supernova Remnants |
| title_short | The TeV Spectral Bump of Cosmic-Ray Protons and Helium Nuclei: The Role of Nearby Supernova Remnants |
| title_sort | tev spectral bump of cosmic ray protons and helium nuclei the role of nearby supernova remnants |
| topic | Galactic cosmic rays Particle astrophysics Shocks Supernova remnants |
| url | https://doi.org/10.3847/1538-4357/ade796 |
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