Possible bump structure of cosmic ray electrons unveiled by AMS-02 data and its common origin along with the nuclei and positron

2021/01/31 by Pei-pei Zhang, Bing-qiang Qiao, Wei Liu +3
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #COSMIC cancer database #Cosmic ray #Dark Matter and Cosmic Phenomena #Earth Systems and Cosmic Evolution #Electron #Positron #Primary (astronomy) #Pulsar #astro-ph.HE

paper · pdf · doi:10.1088/1475-7516/2021/05/012

15 pages, 4 figures published by JCAP

openalex publication_date 2021/05/01 · arxiv created 2021/07/11 · arxiv updated 2021/07/13 · openalex created_date 2021/10/11 · openalex updated_date 2026/08/05

Abstract

Abstract The local pulsar and its progenitor, SNR, can together accelerate the positron, electron and nuclei to very high energy. The famous excesses of positron(nuclei) above 20(200) GeV possibly come from such kind of local source. This hints that the primary electron should also hold “excess” above 200 GeV, synchronously accelerated along with the nuclei. The recent precise measurement of sharp dropoff at 284 GeV of positron by AMS-02 experiment takes chance to study this expected electron excess. In this work, the spatially-dependent propagation with a local source is used to reproduce the spectrum of positron, electron and proton. When considering the dropoff at 284 GeV of positron, a sharp bump structure for primary electron above 284 GeV is required to fit the total spectrum of positron and electron. Then we systematically study the common origin of the excesses of positron, electron and nuclei from Geminga pulsar and SNR. Those excesses can be reproduced under this unified single-source model. Lastly, we hope that the fine bump structure can be observed to support our model by AMS-02 experiment in future.

Citations

• PAMELA Measurements of Cosmic-Ray Proton and Helium Spectra
• ORIGIN OF THE COSMIC-RAY SPECTRAL HARDENING
• PAMELA data and leptonically decaying dark matter
• TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess
• ON THE ENERGY SPECTRA OF GeV/TeV COSMIC RAY LEPTONS
• Is the PAMELA anomaly caused by supernova explosions near the Earth?
• High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–500 GeV with the Alpha Magnetic Spectrometer on the International Space Station
• An anomalous positron abundance in cosmic rays with energies 1.5–100 GeV
• Energy Spectrum of Cosmic-Ray Electrons at TeV Energies
• Astrophysical models for the origin of the positron “excess”
• IS COSMIC RAY ELECTRON EXCESS FROM PULSARS SPIKY OR SMOOTH?: CONTINUOUS AND MULTIPLE ELECTRON/POSITRON INJECTIONS
• Diffusive shock acceleration in radiation-dominated environments
• Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients
• Excesses of cosmic ray spectra from a single nearby source
• Klein-Nishina effect and the cosmic ray electron spectrum