Cosmic-ray hardenings in light of AMS-02 data

Recent precise observations of cosmic rays (CRs) by AMS-02 experiment clearly show (1) harder spectra of helium and carbon compared to protons by [is proportional to] R super(0.08), and (2) concave breaks in proton and helium spectra at a rigidity R ~ 300GV. In particular the helium and carbon spect...

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Bibliographic Details
Published in:Physical review. D 2016-04, Vol.93 (8), Article 083001
Main Authors: Ohira, Yutaka, Kawanaka, Norita, Ioka, Kunihito
Format: Article
Language:English
Subjects:
Alpha Magnetic Spectrometer
Carbon
Cosmic rays
Cosmology
Helium
Interstellar matter
Rigidity
Spectra
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Summary:Recent precise observations of cosmic rays (CRs) by AMS-02 experiment clearly show (1) harder spectra of helium and carbon compared to protons by [is proportional to] R super(0.08), and (2) concave breaks in proton and helium spectra at a rigidity R ~ 300GV. In particular the helium and carbon spectra are exactly similar, pointing to the same acceleration site. We examine possible interpretations of these features and identify a chemically enriched region, that is, superbubbles as the most probable origin of Galactic CRs in high rigidity R > 30 GV. The similar spectra of CR carbon and helium further suggest that the CRs with R > 30 GV originate from the supernova ejecta in the superbubble core, mixed with comparable or less amount of interstellar medium. We predict similar spectra for heavy nuclei.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.93.083001