CALET's sensitivity to electron cosmic-ray spectral and anisotropy signatures of the Vela SNR
The ISS-based Calorimetric Electron Telescope (CALET) is directly measuring energy and arrival direction of electron+positron cosmic rays (CR) well into the TeV region. Due to energy loss in propagation, TeV-range CR electrons are expected to originate from only a few nearby and young supernova remnants (SNRs), foremost the Vela SNR, potentially giving rise to spectral features and flux anisotropy as signatures. To further CALET's goal of finding a signature of Vela, a novel non-binned analysis algorithm quantifying the significance of a potential spectral hardening in the TeV region from the near-SNR contribution was developed, as well as an analysis method for anisotropy which enhances the signature significance by fixing the dipole axis towards the Vela SNR. The sensitivity of CALET to these spectral and anisotropy signatures was evaluated by using the new analysis methods on simulated event samples based on an interpretation model fitted to the currently measured electron and positron spectra. In addition to an explanation of the analysis methods, the expected significance of the spectral and anisotropy signatures as well as their combination are presented for a selection of representative conditions for the emission of electron CR by the nearby SNRs.
Authors
- G. A. de Nolfo (ORCID: https://orcid.org/0000-0002-3677-074X)
- M. Mori (ORCID: https://orcid.org/0000-0003-2921-1592)
- S. Ricciarini (ORCID: https://orcid.org/0000-0001-6176-3368)
- E. Berti
- Wolfgang V Zober (ORCID: https://orcid.org/0000-0003-2961-8894)
- John Krizmanic (ORCID: https://orcid.org/0000-0002-9690-9352)
- Y. Katayose (ORCID: https://orcid.org/0000-0003-4836-7621)
- C. Kato
- Kazunori Kohri (ORCID: https://orcid.org/0000-0003-3764-8612)
- C. Checchia (ORCID: https://orcid.org/0000-0003-1241-0413)
- N. Mori
- S. Yanagita (ORCID: https://orcid.org/0000-0002-5837-8511)
- K. Kasahara (ORCID: https://orcid.org/0000-0001-5611-3301)
- J. F. Ormes (ORCID: https://orcid.org/0000-0002-7220-6409)
- Kenji Yoshida (ORCID: https://orcid.org/0000-0001-6813-2665)
- M. Mattiazzi (ORCID: https://orcid.org/0000-0003-3900-6816)
- T. Hams
- M. Bongi (ORCID: https://orcid.org/0000-0002-6050-1937)
- K. Hibino (ORCID: https://orcid.org/0000-0001-9259-6371)
- Y. Asaoka (ORCID: https://orcid.org/0000-0001-6440-933X)
- P. Papini (ORCID: https://orcid.org/0000-0003-4718-2895)
- Shoko Miyake (ORCID: https://orcid.org/0000-0002-3067-655X)
- L. Pacini (ORCID: https://orcid.org/0000-0001-6808-9396)
- K. Yamaoka (ORCID: https://orcid.org/0000-0003-3841-0980)
- S. Torii
- A. Shiomi (ORCID: https://orcid.org/0000-0002-2616-0059)
- M. H. Israel (ORCID: https://orcid.org/0000-0002-8104-208X)
- T. G. Guzik (ORCID: https://orcid.org/0000-0001-6339-8261)
- G. Bigongiari (ORCID: https://orcid.org/0000-0003-3691-0826)
- P. Betti (ORCID: https://orcid.org/0000-0002-7097-165X)
- Y. Shimizu (ORCID: https://orcid.org/0000-0001-5473-5684)
- A. Yoshida (ORCID: https://orcid.org/0000-0003-4049-137X)
- Holger Motz (ORCID: https://orcid.org/0000-0003-1918-2177)
- H. Fuke (ORCID: https://orcid.org/0000-0002-8071-3398)
- G. Castellini (ORCID: https://orcid.org/0000-0002-0177-0643)
- Ken Ebisawa (ORCID: https://orcid.org/0000-0002-5352-7178)
- J. P. Wefel
- P. Brogi (ORCID: https://orcid.org/0000-0001-7953-0271)
- T. Terasawa (ORCID: https://orcid.org/0000-0003-2507-9803)
- T. Sakamoto (ORCID: https://orcid.org/0000-0001-6276-6616)
- Norita Kawanaka (ORCID: https://orcid.org/0000-0001-8181-7511)
- B. F. Rauch (ORCID: https://orcid.org/0000-0002-1452-4142)
- H. Krawczynski (ORCID: https://orcid.org/0000-0002-1084-6507)
- Katsuaki Asano (ORCID: https://orcid.org/0000-0001-9064-160X)
- Michela Negro (ORCID: https://orcid.org/0000-0002-6548-5622)
- F. Stolzi (ORCID: https://orcid.org/0000-0001-9266-8742)
- Anthony W. Ficklin
- K. Munakata (ORCID: https://orcid.org/0000-0002-2131-4100)
- Yosui Akaike (ORCID: https://orcid.org/0000-0002-9489-1515)
- M. Ichimura (ORCID: https://orcid.org/0000-0002-0052-4985)
- A. Bruno (ORCID: https://orcid.org/0000-0001-5191-1662)
- S. Ozawa
- S. Sugita (ORCID: https://orcid.org/0000-0002-3634-7095)
- А.А. Моисеев
- J. Kataoka (ORCID: https://orcid.org/0000-0003-2819-6415)
- W. R. Binns (ORCID: https://orcid.org/0000-0001-6110-3407)
- M. L. Cherry (ORCID: https://orcid.org/0000-0003-2808-312X)
- Y. Kawakubo (ORCID: https://orcid.org/0000-0002-2064-3164)
- E. Vannuccini
- Ryuho Kataoka (ORCID: https://orcid.org/0000-0001-9400-1765)
- O. Adriani (ORCID: https://orcid.org/0000-0002-3592-0654)
- Jun Nishimura (ORCID: https://orcid.org/0000-0003-3232-538X)
- Kenichi Sakai (ORCID: https://orcid.org/0000-0003-4038-8954)
- S. Nakahira (ORCID: https://orcid.org/0000-0001-9307-046X)
- P. Maestro (ORCID: https://orcid.org/0000-0002-4193-1288)
- A. Messineo (ORCID: https://orcid.org/0000-0001-7551-5613)
- S. Gonzi (ORCID: https://orcid.org/0000-0003-4754-645X)
- M. Sasaki (ORCID: https://orcid.org/0000-0003-1093-9655)
- G. Collazuol (ORCID: https://orcid.org/0000-0002-7876-6124)
- N. Cannady (ORCID: https://orcid.org/0000-0003-2916-6955)
- Kazuyoshi Kobayashi (ORCID: https://orcid.org/0000-0003-1721-9626)
- J. W. Mitchell
- Y. Tsunesada (ORCID: https://orcid.org/0000-0001-9238-6817)
- M. Takita (ORCID: https://orcid.org/0000-0003-0435-5362)
- Y. Uchihori
- П. Спиллантини
- P.S. Marrocchesi
- A. Sulaj
- S. Okuno
- T. Tamura (ORCID: https://orcid.org/0009-0005-9123-8085)
Publication Details
- Published
- 2025-09-23
- DOI
- https://doi.org/10.22323/1.501.0099
- Primary Topic
- Dark Matter and Cosmic Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Aeronautics and Space Administration
- Ministry of Education, Culture, Sports, Science and Technology
- Waseda University
- Japan Society for the Promotion of Science
- Japan Aerospace Exploration Agency