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Inferred cosmic-ray spectrum from \({\it Fermi}\)-LAT \(\gamma\)-ray observations of the Earth's limb

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 ne... Full description

Journal Title: arXiv.org Mar 21, 2014
Main Author: Ackermann, M
Other Authors: Ajello, M , Albert, A , Allafort, A , Baldini, L , Barbiellini, G , Bastieri, D , Bechtol, K , Bellazzini, R , Blandford, R , Bloom, E , Bonamente, E , Bottacini, E , Bouvier, A , Brandt, T , Brigida, M , Bruel, P , Buehler, R , Buson, S , Caliandro
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Language: English
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title: Inferred cosmic-ray spectrum from \({\it Fermi}\)-LAT \(\gamma\)-ray observations of the Earth's limb
format: Article
creator:
  • Ackermann, M
  • Ajello, M
  • Albert, A
  • Allafort, A
  • Baldini, L
  • Barbiellini, G
  • Bastieri, D
  • Bechtol, K
  • Bellazzini, R
  • Blandford, R
  • Bloom, E
  • Bonamente, E
  • Bottacini, E
  • Bouvier, A
  • Brandt, T
  • Brigida, M
  • Bruel, P
  • Buehler, R
  • Buson, S
  • Caliandro
subjects:
  • Spectra
  • Power Law
  • Cosmic Rays
  • Gamma Rays
  • Earth Limb
ispartof: arXiv.org, Mar 21, 2014
description: 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 \({\it Fermi}\) Large Area Telescope observations of the \(\gamma\)-ray emission from the Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range \(\sim 90~\)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 \(2.68 \pm 0.04\) and \(2.61 \pm 0.08\) above \(\sim 200~\)GeV, respectively.
language: eng
source: © ProQuest LLC All rights reserved
identifier:
fulltext: fulltext_linktorsrc
url: Link


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titleInferred cosmic-ray spectrum from \({\it Fermi}\)-LAT \(\gamma\)-ray observations of the Earth's limb
creatorAckermann, M ; Ajello, M ; Albert, A ; Allafort, A ; Baldini, L ; Barbiellini, G ; Bastieri, D ; Bechtol, K ; Bellazzini, R ; Blandford, R ; Bloom, E ; Bonamente, E ; Bottacini, E ; Bouvier, A ; Brandt, T ; Brigida, M ; Bruel, P ; Buehler, R ; Buson, S ; Caliandro
contributorYang, Z (pacrepositoryorg)
ispartofarXiv.org, Mar 21, 2014
subjectSpectra ; Power Law ; Cosmic Rays ; Gamma Rays ; Earth Limb
descriptionRecent 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 \({\it Fermi}\) Large Area Telescope observations of the \(\gamma\)-ray emission from the Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range \(\sim 90~\)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 \(2.68 \pm 0.04\) and \(2.61 \pm 0.08\) above \(\sim 200~\)GeV, respectively.
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10Bloom, E
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15Brigida, M
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17Buehler, R
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20Cameron, R
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23Charles, E
24Chaves, R
25Chekhtman, A
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30Cohen-Tanugi, J
31Conrad, J
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37Dermer, C
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53Giordano, F
54Giroletti, M
55Glanzman, T
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titleInferred cosmic-ray spectrum from \({\it Fermi}\)-LAT \(\gamma\)-ray observations of the Earth's limb
descriptionRecent 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 \({\it Fermi}\) Large Area Telescope observations of the \(\gamma\)-ray emission from the Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range \(\sim 90~\)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 \(2.68 \pm 0.04\) and \(2.61 \pm 0.08\) above \(\sim 200~\)GeV, respectively.
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titleInferred cosmic-ray spectrum from \({\it Fermi}\)-LAT \(\gamma\)-ray observations of the Earth's limb
authorAckermann, M ; Ajello, M ; Albert, A ; Allafort, A ; Baldini, L ; Barbiellini, G ; Bastieri, D ; Bechtol, K ; Bellazzini, R ; Blandford, R ; Bloom, E ; Bonamente, E ; Bottacini, E ; Bouvier, A ; Brandt, T ; Brigida, M ; Bruel, P ; Buehler, R ; Buson, S ; Caliandro
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8Bellazzini, R
9Blandford, R
10Bloom, E
11Bonamente, E
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13Bouvier, A
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19Caliandro, G
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22Cecchi, C
23Charles, E
24Chaves, R
25Chekhtman, A
26Chiang, J
27Chiaro, G
28Ciprini, S
29Claus, R
30Cohen-Tanugi, J
31Conrad, J
32Cutini, S
33Dalton, M
34D'Ammando, F
35de Angelis, A
36de Palma, F
37Dermer, C
38Digel, S
39Drell, P
40Drlica-Wagner, A
41Favuzzi, C
42Fegan, S
43Ferrara, E
44Focke, W
45Franckowiak, A
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47Funk, S
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97Morselli, A
98Moskalenko, I
99Murgia, S
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atitleInferred cosmic-ray spectrum from \({\it Fermi}\)-LAT \(\gamma\)-ray observations of the Earth's limb
jtitlearXiv.org
risdate20140321
formatjournal
genrearticle
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abstractRecent 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 \({\it Fermi}\) Large Area Telescope observations of the \(\gamma\)-ray emission from the Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range \(\sim 90~\)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 \(2.68 \pm 0.04\) and \(2.61 \pm 0.08\) above \(\sim 200~\)GeV, respectively.
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pubCornell University Library, arXiv.org
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date2014-03-21