Interpretation of the CALET Electron+Positron Spectrum concerning Dark Matter Signatures

Motz, H.; Asaoka, Y.; Bhattacharyya, Saptashwa

doi:10.22323/1.358.0533

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…There are quite a number of publications discussing the contributions to the all-electron spectrum from local sources. Such multi-component models include the average electron spectrum from distant Galactic sources, parametrized contributions from local catalog sources (SNRs, PWNe), and may utilize the observed radio spectral indices of local SNRs, see examples in [122,123].…”

Section: Pos(icrc2023)020mentioning

confidence: 99%

Direct measurements of cosmic rays and their possible interpretations

Moskalenko

2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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The last two decades have brought spectacular advances in astrophysics of cosmic rays (CRs) and space-and ground-based astronomy. Launches of missions that employ forefront detector technologies enabled measurements with large effective areas, wide fields of view, and precision that we recently could not even dream of. Meanwhile, interpretation of the individual slices of information about the internal working of the Milky Way provided by such experiments poses challenges to the traditional astrophysical models. New mysteries arise in the composition and spectra of CR species at low and high energies, in the energy range where we thought the main features were already understood fairly well. This accumulation of unsolved puzzles highlights the peculiarity of the current epoch and means that major breakthroughs are still ahead. In my talk, I review the current state of direct measurements of CRs and discuss their possible interpretations. Unfortunately, many important ideas and publications are not discussed here due to the space limitations.

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Section: Pos(icrc2023)020mentioning

confidence: 99%

Direct measurements of cosmic rays and their possible interpretations

Moskalenko

2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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“…The parameters of the model were determined by comparing nuclei spectra calculated with DRAGON [7] to experimental proton [8][9][10], helium [11][12][13] (including low-energy Voyager data [14]), carbon, oxygen spectra [15], and B/C [16, 17], 3 He/ 4 He [18] ratios. By a random walk scan of the parameter space, the parameters listed in table 1, which fit the combined nuclei spectra data with χ 2 /ndof < 1, were found.…”

Section: Propagation Model and Calculation Of Dark Matter Signalmentioning

confidence: 99%

“…The astrophysical background for the positron spectrum is limited to pulsars and secondary particles, but it reaches only up to 1 TeV, while the background for the all-electron spectrum which extends up to 4.8 TeV includes also SNRs. Based on previously established methods [3][4][5], this study focuses on TeV-mass-range DM, with an improved background model treating the nearby SNRs Vela, Monogem and Cygnus Loop, which dominate the TeV-region [6], as individual sources.…”

Section: Introductionmentioning

confidence: 99%

Constraints on heavy dark matter annihilation and decay from electron and positron cosmic ray spectra

Motz

2023

SciPost Phys. Proc.

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Annihilation or decay of dark matter (DM) could contribute to the electron and positron cosmic-ray flux, allowing for constraints on DM parameters from its measurement. CALET is directly measuring the energy spectrum of electron+positron cosmic rays up into the TeV region most important for studying heavy DM, while AMS-02 provides a positron-only spectrum below the TeV range. Limits on DM annihilation and decay well into the TeV mass range have been derived from a combined analysis of both data-sets with an astrophysical background model including pulsars as the origin of the positron excess and individual nearby supernova remnant sources.

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“…The spectrum injected by each pulsar is propagated using the analytic solution of the propagation equation for a point source as explained in Ref. [16]. The diffusion coefficient is approximated by the rigidity dependent function at the position solar system with normalization 0( ) listed in Table 1.…”

Section: Pos(icrc2021)100mentioning

confidence: 99%

“…A shift by Δ( ) is performed as part of the fit function with the weight for each systematic uncertainty source as a free parameter and each squared weight added to the total 2 of the fit as explained in Ref. [16]. With this method, the known energy dependence of the systematic uncertainty connects the high energy range relevant for nearby SNR signatures to lower energy data-points, improving the constraint on the model over quadratic addition of statistical and systematic error.…”

Section: Fitting and Limit Calculationmentioning

confidence: 99%

Investigating the Vela SNR's Emission of Electron Cosmic Rays with CALET at the International Space Station

Motz¹,

Адриани²,

Akaike³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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The ISS-based Calorimetric Electron Telescope (CALET) is directly measuring the energy spectrum of electron+positron cosmic rays up to 20 TeV. Cosmic-ray electrons of TeV region energy are limited by energy loss to a propagation range of about 1 kpc, therefore the expected sources are a few nearby supernova remnants (SNR), with the Vela SNR dominating the spectrum [1]. The latest spectrum measured by CALET [2] in combination with the positron-only flux published by AMS-02 [3] is fitted with a comprehensive model including nearby pulsars as the source of the positron excess. This model is extended to the TeV region by addition of the flux from the Vela SNR as calculated with DRAGON, with the integrated energy emitted in electron cosmic rays by the SNR as a variable scale factor. Exploring various scenarios for the time and energy dependence of the cosmic-ray release from Vela, under varied propagation conditions, best-fitting interpretations of the spectrum and upper limits on the emission of cosmic-ray electrons by Vela have been derived.

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Interpretation of the CALET Electron+Positron Spectrum concerning Dark Matter Signatures

Cited by 3 publications

References 7 publications

Direct measurements of cosmic rays and their possible interpretations

Direct measurements of cosmic rays and their possible interpretations

Constraints on heavy dark matter annihilation and decay from electron and positron cosmic ray spectra

Investigating the Vela SNR's Emission of Electron Cosmic Rays with CALET at the International Space Station

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