Measurement of the iron spectrum in cosmic rays by VERITAS

(VERITAS Collaboration)

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present a new measurement of the energy spectrum of iron nuclei in cosmic rays from 20 TeV to 500 TeV. The measurement makes use of a template-based analysis method, which, for the first time, is applied to the energy reconstruction of iron-induced air showers recorded by the VERITAS array of imaging atmospheric Cherenkov telescopes. The event selection makes use of the direct Cherenkov light which is emitted by charged particles before the first interaction, as well as other parameters related to the shape of the recorded air shower images. The measured spectrum is well described by a power law dFdE=f0·(EE0)-γ over the full energy range, with γ=2.82±0.30(stat)-0.27+0.24(syst) and f0=(4.82±0.98(stat)-2.70+2.12(syst))×10-7 m-2 s-1 TeV-1 sr-1 at E0=50 TeV, with no indication of a cutoff or spectral break. The measured differential flux is compatible with previous results, with improved statistical uncertainty at the highest energies.

Original languageEnglish (US)
Article number022009
JournalPhysical Review D
Volume98
Issue number2
DOIs
StatePublished - Jul 15 2018

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cosmic rays
cosmic ray showers
iron
energy
charged particles
indication
energy spectra
cut-off
templates
telescopes
nuclei
interactions

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Measurement of the iron spectrum in cosmic rays by VERITAS. / (VERITAS Collaboration).

In: Physical Review D, Vol. 98, No. 2, 022009, 15.07.2018.

Research output: Contribution to journalArticle

(VERITAS Collaboration). / Measurement of the iron spectrum in cosmic rays by VERITAS. In: Physical Review D. 2018 ; Vol. 98, No. 2.
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abstract = "We present a new measurement of the energy spectrum of iron nuclei in cosmic rays from 20 TeV to 500 TeV. The measurement makes use of a template-based analysis method, which, for the first time, is applied to the energy reconstruction of iron-induced air showers recorded by the VERITAS array of imaging atmospheric Cherenkov telescopes. The event selection makes use of the direct Cherenkov light which is emitted by charged particles before the first interaction, as well as other parameters related to the shape of the recorded air shower images. The measured spectrum is well described by a power law dFdE=f0·(EE0)-γ over the full energy range, with γ=2.82±0.30(stat)-0.27+0.24(syst) and f0=(4.82±0.98(stat)-2.70+2.12(syst))×10-7 m-2 s-1 TeV-1 sr-1 at E0=50 TeV, with no indication of a cutoff or spectral break. The measured differential flux is compatible with previous results, with improved statistical uncertainty at the highest energies.",
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N2 - We present a new measurement of the energy spectrum of iron nuclei in cosmic rays from 20 TeV to 500 TeV. The measurement makes use of a template-based analysis method, which, for the first time, is applied to the energy reconstruction of iron-induced air showers recorded by the VERITAS array of imaging atmospheric Cherenkov telescopes. The event selection makes use of the direct Cherenkov light which is emitted by charged particles before the first interaction, as well as other parameters related to the shape of the recorded air shower images. The measured spectrum is well described by a power law dFdE=f0·(EE0)-γ over the full energy range, with γ=2.82±0.30(stat)-0.27+0.24(syst) and f0=(4.82±0.98(stat)-2.70+2.12(syst))×10-7 m-2 s-1 TeV-1 sr-1 at E0=50 TeV, with no indication of a cutoff or spectral break. The measured differential flux is compatible with previous results, with improved statistical uncertainty at the highest energies.

AB - We present a new measurement of the energy spectrum of iron nuclei in cosmic rays from 20 TeV to 500 TeV. The measurement makes use of a template-based analysis method, which, for the first time, is applied to the energy reconstruction of iron-induced air showers recorded by the VERITAS array of imaging atmospheric Cherenkov telescopes. The event selection makes use of the direct Cherenkov light which is emitted by charged particles before the first interaction, as well as other parameters related to the shape of the recorded air shower images. The measured spectrum is well described by a power law dFdE=f0·(EE0)-γ over the full energy range, with γ=2.82±0.30(stat)-0.27+0.24(syst) and f0=(4.82±0.98(stat)-2.70+2.12(syst))×10-7 m-2 s-1 TeV-1 sr-1 at E0=50 TeV, with no indication of a cutoff or spectral break. The measured differential flux is compatible with previous results, with improved statistical uncertainty at the highest energies.

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