Journal
ASTROPHYSICAL JOURNAL
Volume 698, Issue 2, Pages 2121-2130Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/698/2/2121
Keywords
cosmic rays; Galaxy: halo; ISM: magnetic fields; solar neighborhood; Sun: activity; supernova remnants
Categories
Funding
- National Science Foundation [PHY-0245234, PHY-0302000, PHY-0400424, PHY-0504201, PHY-0601080, ATM-0002744]
- US Department of Energy
- Los Alamos National Laboratory
- University of California
- Institute of Geophysics and Planetary Physics
Ask authors/readers for more resources
Results are presented of a harmonic analysis of the large-scale cosmic-ray (CR) anisotropy as observed by the Milagro observatory. We show a two-dimensional display of the sidereal anisotropy projections in right ascension (R.A.) generated by the fitting of three harmonics to 18 separate declination bands. The Milagro observatory is a water Cherenkov detector located in the Jemez mountains near Los Alamos, New Mexico. With a high duty cycle and large field of view, Milagro is an excellent instrument for measuring this anisotropy with high sensitivity at TeV energies. The analysis is conducted using a seven-year data sample consisting of more than 95 billion events, the largest such data set in existence. We observe an anisotropy with a magnitude around 0.1% for CRs with a median energy of 6 TeV. The dominant feature is a deficit region of depth (2.49 +/- 0.02 stat. +/- 0.09 sys.) x 10(-3) in the direction of the Galactic north pole centered at 189 deg R.A. We observe a steady increase in the magnitude of the signal over seven years.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available