Towards Understanding the Origin of Cosmic-Ray Electrons

AMS Collaboration

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Precision results on cosmic-ray electrons are presented in the energy range from 0.5 GeV to 1.4 TeV based on 28.1×106 electrons collected by the Alpha Magnetic Spectrometer on the International Space Station. In the entire energy range the electron and positron spectra have distinctly different magnitudes and energy dependences. The electron flux exhibits a significant excess starting from 42.1-5.2+5.4 GeV compared to the lower energy trends, but the nature of this excess is different from the positron flux excess above 25.2±1.8 GeV. Contrary to the positron flux, which has an exponential energy cutoff of 810-180+310 GeV, at the 5σ level the electron flux does not have an energy cutoff below 1.9 TeV. In the entire energy range the electron flux is well described by the sum of two power law components. The different behavior of the cosmic-ray electrons and positrons measured by the Alpha Magnetic Spectrometer is clear evidence that most high energy electrons originate from different sources than high energy positrons.

Original languageEnglish
Article number101101
JournalPhysical review letters
Volume122
Issue number10
DOIs
Publication statusPublished - 2019 Mar 13

Fingerprint

cosmic rays
positrons
electron flux
electrons
Alpha Magnetic Spectrometer
energy
cut-off
International Space Station
high energy electrons
trends

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

AMS Collaboration. / Towards Understanding the Origin of Cosmic-Ray Electrons. In: Physical review letters. 2019 ; Vol. 122, No. 10.
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title = "Towards Understanding the Origin of Cosmic-Ray Electrons",
abstract = "Precision results on cosmic-ray electrons are presented in the energy range from 0.5 GeV to 1.4 TeV based on 28.1×106 electrons collected by the Alpha Magnetic Spectrometer on the International Space Station. In the entire energy range the electron and positron spectra have distinctly different magnitudes and energy dependences. The electron flux exhibits a significant excess starting from 42.1-5.2+5.4 GeV compared to the lower energy trends, but the nature of this excess is different from the positron flux excess above 25.2±1.8 GeV. Contrary to the positron flux, which has an exponential energy cutoff of 810-180+310 GeV, at the 5σ level the electron flux does not have an energy cutoff below 1.9 TeV. In the entire energy range the electron flux is well described by the sum of two power law components. The different behavior of the cosmic-ray electrons and positrons measured by the Alpha Magnetic Spectrometer is clear evidence that most high energy electrons originate from different sources than high energy positrons.",
author = "{AMS Collaboration} and M. Aguilar and {Ali Cavasonza}, L. and B. Alpat and G. Ambrosi and L. Arruda and N. Attig and P. Azzarello and A. Bachlechner and F. Barao and A. Barrau and L. Barrin and A. Bartoloni and L. Basara and {Başeǧmez-Du Pree}, S. and R. Battiston and U. Becker and M. Behlmann and B. Beischer and J. Berdugo and B. Bertucci and V. Bindi and {De Boer}, W. and K. Bollweg and B. Borgia and Boschini, {M. J.} and M. Bourquin and Bueno, {E. F.} and J. Burger and Burger, {W. J.} and Cai, {X. D.} and M. Capell and S. Caroff and J. Casaus and G. Castellini and F. Cervelli and Chang, {Y. H.} and Chen, {G. M.} and Chen, {H. S.} and Y. Chen and L. Cheng and Chou, {H. Y.} and V. Choutko and Chung, {C. H.} and C. Clark and G. Coignet and C. Consolandi and A. Contin and C. Corti and M. Crispoltoni and Yi Yang",
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Towards Understanding the Origin of Cosmic-Ray Electrons. / AMS Collaboration.

In: Physical review letters, Vol. 122, No. 10, 101101, 13.03.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Towards Understanding the Origin of Cosmic-Ray Electrons

AU - AMS Collaboration

AU - Aguilar, M.

AU - Ali Cavasonza, L.

AU - Alpat, B.

AU - Ambrosi, G.

AU - Arruda, L.

AU - Attig, N.

AU - Azzarello, P.

AU - Bachlechner, A.

AU - Barao, F.

AU - Barrau, A.

AU - Barrin, L.

AU - Bartoloni, A.

AU - Basara, L.

AU - Başeǧmez-Du Pree, S.

AU - Battiston, R.

AU - Becker, U.

AU - Behlmann, M.

AU - Beischer, B.

AU - Berdugo, J.

AU - Bertucci, B.

AU - Bindi, V.

AU - De Boer, W.

AU - Bollweg, K.

AU - Borgia, B.

AU - Boschini, M. J.

AU - Bourquin, M.

AU - Bueno, E. F.

AU - Burger, J.

AU - Burger, W. J.

AU - Cai, X. D.

AU - Capell, M.

AU - Caroff, S.

AU - Casaus, J.

AU - Castellini, G.

AU - Cervelli, F.

AU - Chang, Y. H.

AU - Chen, G. M.

AU - Chen, H. S.

AU - Chen, Y.

AU - Cheng, L.

AU - Chou, H. Y.

AU - Choutko, V.

AU - Chung, C. H.

AU - Clark, C.

AU - Coignet, G.

AU - Consolandi, C.

AU - Contin, A.

AU - Corti, C.

AU - Crispoltoni, M.

AU - Yang, Yi

PY - 2019/3/13

Y1 - 2019/3/13

N2 - Precision results on cosmic-ray electrons are presented in the energy range from 0.5 GeV to 1.4 TeV based on 28.1×106 electrons collected by the Alpha Magnetic Spectrometer on the International Space Station. In the entire energy range the electron and positron spectra have distinctly different magnitudes and energy dependences. The electron flux exhibits a significant excess starting from 42.1-5.2+5.4 GeV compared to the lower energy trends, but the nature of this excess is different from the positron flux excess above 25.2±1.8 GeV. Contrary to the positron flux, which has an exponential energy cutoff of 810-180+310 GeV, at the 5σ level the electron flux does not have an energy cutoff below 1.9 TeV. In the entire energy range the electron flux is well described by the sum of two power law components. The different behavior of the cosmic-ray electrons and positrons measured by the Alpha Magnetic Spectrometer is clear evidence that most high energy electrons originate from different sources than high energy positrons.

AB - Precision results on cosmic-ray electrons are presented in the energy range from 0.5 GeV to 1.4 TeV based on 28.1×106 electrons collected by the Alpha Magnetic Spectrometer on the International Space Station. In the entire energy range the electron and positron spectra have distinctly different magnitudes and energy dependences. The electron flux exhibits a significant excess starting from 42.1-5.2+5.4 GeV compared to the lower energy trends, but the nature of this excess is different from the positron flux excess above 25.2±1.8 GeV. Contrary to the positron flux, which has an exponential energy cutoff of 810-180+310 GeV, at the 5σ level the electron flux does not have an energy cutoff below 1.9 TeV. In the entire energy range the electron flux is well described by the sum of two power law components. The different behavior of the cosmic-ray electrons and positrons measured by the Alpha Magnetic Spectrometer is clear evidence that most high energy electrons originate from different sources than high energy positrons.

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U2 - 10.1103/PhysRevLett.122.101101

DO - 10.1103/PhysRevLett.122.101101

M3 - Article

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JO - Physical Review Letters

JF - Physical Review Letters

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ER -