Anisotropies at Ultra High Energies and the Galactic Halo

Details Anisotropies at Ultra High Energies and the Galactic Halo Anisotropies at Ultra High Energies and the Galactic Halo

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3..272w&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

A measure of consistency is appearing in measurements of the anisotropy of arrival directions above 1017 eV and these show a Galactic Plane Enhancement and a S-N excess, to about 3.1018 eV. The implication is that Galactic particles predominate here. At higher energies, where an Extragalactic origin is preferred, a contender for the `sources' is exotic dark matter particles. However, an analysis of the anisotropy at the highest energies, or, rather, the lack of it, makes this interpretation highly unlikely. Instead, `bottom-up' acceleration, in galaxy-systems is preferred; the likely mass mixture of the primaries, above 1018 eV, helps to explain why strong clustering of arrival is not observed.

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