Physics
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..apr.t8002k&link_type=abstract
American Physical Society, 2008 APS April Meeting and HEDP/HEDLA Meeting, April 11-15, 2008, abstract #T8.002
Physics
Scientific paper
The Milagro observatory is a water Cherenkov detector located in the Jemez mountains outside of Los Alamos, New Mexico. With a high duty cycle and large field-of-view, Milagro has high sensitivity for measuring the large scale cosmic-ray anisotropy at TeV energies. We present a two-dimensional map of the sidereal anisotropy generated by a harmonic analysis of the data collected over a seven year period consisting of more than 160 billion events. We observe an anisotropy with a magnitude on the order of 0.1% for cosmic rays with a median energy of 3 TeV. The dominant feature is a deficit region of mean depth (-2.5 ±0.046 stat. ±0.19 syst.)x10-3 in the direction of the Galactic North Pole with a range in declination of -10 to 45 degrees and 150 to 225 degrees in right ascension. We also present evidence of an increase in the magnitude of this deficit region over time as well as a weakening of the signal for energies above 20 TeV.
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