Understanding tev-band cosmic-ray anisotropy

Martin Pohl, David Eichler

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

We investigate the temporal and spectral correlations between flux and anisotropy fluctuations of TeV-band cosmic rays in light of recent data taken with IceCube. We find that for a conventional distribution of cosmic-ray sources, the dipole anisotropy is higher than observed, even if source discreteness is taken into account. Moreover, even for a shallow distribution of galactic cosmic-ray sources and a reacceleration model, fluctuations arising from source discreteness provide a probability only of the order of 10% that the cosmic-ray anisotropy limits of the recent IceCube analysis are met. This probability estimate is nearly independent of the exact choice of source rate, but generous for a large halo size. The location of the intensity maximum far from the Galactic Center is naturally reproduced.

Original languageEnglish
Article number4
JournalAstrophysical Journal
Volume766
Issue number1
DOIs
StatePublished - 20 Mar 2013

Keywords

  • cosmic rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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