Understanding TeV-band cosmic-ray anistropy

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.

Metadaten
Verfasserangaben:	Martin Pohl ORCiD GND, David Eichler
DOI:	https://doi.org/10.1088/0004-637X/766/1/4
ISSN:	0004-637X
Titel des übergeordneten Werks (Englisch):	The astrophysical journal : an international review of spectroscopy and astronomical physics
Verlag:	IOP Publ. Ltd.
Verlagsort:	Bristol
Publikationstyp:	Wissenschaftlicher Artikel
Sprache:	Englisch
Jahr der Erstveröffentlichung:	2013
Erscheinungsjahr:	2013
Datum der Freischaltung:	26.03.2017
Freies Schlagwort / Tag:	cosmic rays
Band:	766
Ausgabe:	1
Seitenanzahl:	9
Fördernde Institution:	Helmholtz Alliance for Astroparticle Physics, HAP; Initiative and Networking Fund of the Helmholtz Association; Israel-US Binational Science Foundation; Israeli Science Foundation; Joan and Robert Arnow Chair of Theoretical Astrophysics
Organisationseinheiten:	Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:	Referiert