THE LARGE-SCALE COSMIC-RAY ANISOTROPY AS OBSERVED WITH MILAGRO

被引：162

作者：

Abdo, A. A. ^{[1
,2
]}

Allen, B. T. ^{[3
]}

Aune, T. ^{[4
]}

Berley, D. ^{[5
]}

Casanova, S. ^{[6
]}

Chen, C. ^{[3
]}

Dingus, B. L. ^{[6
]}

Ellsworth, R. W. ^{[7
]}

Fleysher, L. ^{[8
]}

Fleysher, R. ^{[8
]}

Gonzalez, M. M. ^{[9
]}

Goodman, J. A. ^{[5
]}

Hoffman, C. M. ^{[6
]}

Hopper, B. ^{[5
]}

Huentemeyer, P. H. ^{[6
]}

Kolterman, B. E. ^{[8
]}

Lansdell, C. P. ^{[5
]}

Linnemann, J. T. ^{[10
]}

McEnery, J. E. ^{[11
]}

Mincer, A. I. ^{[8
]}

Nemethy, P. ^{[8
]}

Noyes, D. ^{[5
]}

Pretz, J. ^{[6
]}

Ryan, J. M. ^{[12
]}

Parkinson, P. M. Saz ^{[4
]}

Shoup, A. ^{[13
]}

Sinnis, G. ^{[6
]}

Smith, A. J. ^{[5
]}

Sullivan, G. W. ^{[5
]}

Vasileiou, V. ^{[5
]}

Walker, G. P. ^{[6
]}

Williams, D. A. ^{[4
]}

Yodh, G. B. ^{[3
]}

机构：

[1] Natl Acad Sci, Natl Res Council Res Associate, Washington, DC 20001 USA

[2] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA

[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[4] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

[5] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[6] Los Alamos Natl Lab, Grp P 23, Los Alamos, NM 87545 USA

[7] George Mason Univ, Dept Phys & Astron, Fairfax, VA 22030 USA

[8] NYU, Dept Phys, New York, NY 10003 USA

[9] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico

[10] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[11] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[12] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA

[13] Ohio State Univ, Lima, OH 45804 USA

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 698卷 / 02期

基金：

美国国家科学基金会;

关键词：

cosmic rays; Galaxy: halo; ISM: magnetic fields; solar neighborhood; Sun: activity; supernova remnants; GALACTIC PLANE; INTENSITY;

D O I：

10.1088/0004-637X/698/2/2121

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：2121 / 2130

页数：10

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