@article{6bc7ec7b2eb34e249c164a2a20179772,
title = "The large-scale cosmic-ray anisotropy as observed with milagro",
abstract = "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.) ×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.",
keywords = "Cosmic rays, Galaxy: halo, ISM: magnetic fields, Solar neighborhood, Sun: activity, Supernova remnants",
author = "Abdo, {A. A.} and Allen, {B. T.} and T. Aune and D. Berley and S. Casanova and C. Chen and Dingus, {B. L.} and Ellsworth, {R. W.} and L. Fleysher and R. Fleysher and Gonzalez, {M. M.} and Goodman, {J. A.} and Hoffman, {C. M.} and B. Hopper and H{\"u}ntemeyer, {P. H.} and Kolterman, {B. E.} and Lansdell, {C. P.} and Linnemann, {J. T.} and McEnery, {J. E.} and Mincer, {A. I.} and P. Nemethy and D. Noyes and J. Pretz and Ryan, {J. M.} and {Saz Parkinson}, {P. M.} and A. Shoup and G. Sinnis and Smith, {A. J.} and Sullivan, {G. W.} and V. Vasileiou and Walker, {G. P.} and Williams, {D. A.} and Yodh, {G. B.}",
note = "Funding Information: We acknowledge Scott Delay and Michael Schneider for their dedicated efforts in the construction and maintenance of the Milagro experiment. This work has been supported by the National Science Foundation (under grants PHY-0245234, −0302000, −0400424, −0504201, −0601080, and ATM-0002744) the US Department of Energy (Office of High-Energy Physics and Office of Nuclear Physics), Los Alamos National Laboratory, the University of California, and the Institute of Geophysics and Planetary Physics. Funding Information: We acknowledge Scott Delay and Michael Schneider for their dedicated efforts in the construction and maintenance of the Milagro experiment. This work has been supported by the National Science Foundation (under grants PHY-0245234, -0302000, -0400424, -0504201, -0601080, and ATM- 0002744) the US Department of Energy (Office of High-Energy Physics and Office of Nuclear Physics), Los Alamos National Laboratory, the University of California, and the Institute of Geophysics and Planetary Physics. Publisher Copyright: {\textcopyright} 2009. The American Astronomical Society. All rights reserved. Printed in the U.S.A.",
year = "2009",
month = jun,
doi = "10.1088/0004-637X/698/2/2121",
language = "English (US)",
volume = "68",
pages = "2121--2130",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",
}