Interpretation of the CALET Electron+Positron Spectrum by Astrophysical Sources

Thumbnail Image

Files

ICRC2023_067.pdf (5.67 MB)

Links to Files

https://pos.sissa.it/444/067/

Permanent Link

https://doi.org/10.22323/1.444.0067
 http://hdl.handle.net/11603/36422

Collections

UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection

Author/Creator

Author/Creator ORCID

https://orcid.org/0000-0003-2916-6955
 https://orcid.org/0000-0002-9247-3010

Date

2023-08-14

Type of Work

conference papers and proceedings
Text

Department

Program

Citation of Original Publication

Motz, Holger, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, et al. “Interpretation of the CALET Electron+Positron Spectrum by Astrophysical Sources.” In Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023), 444:067. SISSA Medialab, 2023. https://doi.org/10.22323/1.444.0067.

Rights

This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain

Subjects

Abstract

The ISS-based Calorimetric Electron Telescope (CALET) is directly measuring the energy spectrum of electron+positron cosmic rays up to 20 TeV. Supernova remnants (SNR) are the most likely astrophysical sources to provide the majority of the electron flux, out of which a few nearby young SNR like Vela are expected to dominate in the TeV-region with potentially detectable spectral signatures. Another expected contribution to the spectrum is from pulsars as a primary positron-electron pair source for explanation of the positron excess. Complementary to the CALET all-electron spectrum, the positron-only spectrum measured by the magnet spectrometer AMS-02 below the TeV range provides detailed information on this component. An interpretation of the CALET and AMS-02 data by overlapping spectra from individual pulsar and SNR point sources is presented, combining sources known from electromagnetic wave observations with further randomly generated ones spread throughout the galaxy. Based on the study of a large number of samples with randomized source locations and emission spectra parameters, best fitting ranges and constraints for these parameters, as well as predictions for the spectrum beyond the so far measured energy range have been derived.