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Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescopeγ-Ray Observations of Earth’s Limb

descriptionPublicationkeyboard_double_arrow_right Article , Journal 17 Apr 2014 France, Italy, France, Italy, France, Germany, France, Italy, Italy, Italy, France, Italy, France, Italy, Italy, Italy, United States, France Publisher:American Physical Society (APS)Journal:Physical Review Letters, volume 112 (issn: 0031-9007, eissn: 1079-7114, Copyright policy )
Authors: Ackermann, Markus; Ajello, M.; Bloom, E. D.; Moskalenko, I. V.; Murgia, S.; Nemmen, R.; Nuss, E.; +146 Authors

doi: 10.1103/physrevlett.112.151103

pmid: 24785023

handle: 11368/2835913 , 11577/2828975 , 11568/504467 , 11589/656 , 11391/1224558 , 11587/516797 , 11585/595759 , 11586/126763

Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescopeγ-Ray Observations of Earth’s Limb

Abstract

Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large Area Telescope observations of the γ-ray emission from Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range ∼90 GeV-6 TeV (derived from a photon energy range 15 GeV-1 TeV). Our analysis shows that single power law and broken power law spectra fit the data equally well and yield a proton spectrum with index 2.68±0.04 and 2.61±0.08 above ∼200 GeV, respectively.

Countries
France, Italy, France, Italy, France, Germany, France, Italy, Italy, Italy, France, Italy, France, Italy, Italy, Italy, United States, France
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Keywords

General Physics, 95.85.Pw, 95.85.Ry, Composition energy spectra and interactions, gamma-ray, Neutrino muon pion and other elementary particles, cosmic rays, Cosmic rays, helium: spectrum, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], Mathematical Sciences, GLAST, 510, [PHYS] Physics [physics], 98.70.Sa, Engineering, Fermi LAT Collaboration, PAMELA, emission [gamma ray], spectrum [cosmic radiation], spectrum [helium], 96.50.sb, astro-ph.HE, [PHYS]Physics [physics], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], cosmic radiation: spectrum, p: spectrum, spectrum [p], energy [photon], photon: energy, 520, gamma ray: emission, Physical Sciences, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], CREAM, ddc: ddc:550

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
29
Top 10%
Top 10%
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