Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC

被引：37

作者：

Abeysekara, A. U. ^{[1
]}

Alfaro, R. ^{[2
]}

Alvarez, C. ^{[3
]}

Alvarez, J. D. ^{[4
]}

Arceo, R. ^{[3
]}

Arteaga-Velazquez, J. C. ^{[4
]}

Avila Rojas, D. ^{[2
]}

Ayala Solares, H. A. ^{[5
]}

Becerril, A. ^{[2
]}

Belmont-Moreno, E. ^{[2
]}

BenZvi, S. Y. ^{[6
]}

Bernal, A. ^{[7
]}

Braun, J. ^{[8
]}

Caballero-Mora, K. S. ^{[3
]}

Capistran, T. ^{[9
]}

Carraminana, A. ^{[9
]}

Casanova, S. ^{[10
,11
]}

Castillo, M. ^{[4
]}

Cotti, U. ^{[4
]}

Cotzomi, J. ^{[12
]}

De Leon, C. ^{[12
]}

De la Fuente, E. ^{[13
]}

Diaz Hernandez, R. ^{[9
]}

Dichiara, S. ^{[7
]}

Dingus, B. L. ^{[14
]}

DuVernois, M. A. ^{[8
]}

Diaz-Velez, J. C. ^{[13
]}

Engel, K. ^{[15
]}

Fiorino, D. W. ^{[15
]}

Fraija, N. ^{[7
]}

Garcia-Gonzalez, J. A. ^{[2
]}

Garfias, F. ^{[7
]}

Gonzalez Munoz, A. ^{[2
]}

Gonzalez, M. M. ^{[7
]}

Goodman, J. A. ^{[15
]}

Hampel-Arias, Z. ^{[8
,16
]}

Harding, J. P. ^{[14
]}

Hernandez, S. ^{[2
]}

Hona, B. ^{[17
]}

Hueyotl-Zahuantitla, F. ^{[3
]}

Hui, C. M. ^{[18
]}

Huntemeyer, P. ^{[17
]}

Iriarte, A. ^{[7
]}

Jardin-Blicq, A. ^{[11
]}

Joshi, V ^{[11
]}

Kaufmann, S. ^{[3
]}

Lara, A. ^{[19
]}

Lauer, R. J. ^{[20
]}

Lee, W. H. ^{[7
]}

Leon Vargas, H. ^{[2
]}

机构：

[1] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

[2] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

[3] Univ Autonoma Chiapas, Chiapas, Tuxtla Gutierre, Mexico

[4] Univ Michoacana, Morelia, Michoacan, Mexico

[5] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

[6] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

[7] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

[8] Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

[9] Inst Nacl Astrofis Ptica & Elect, Puebla, Mexico

[10] Polish Acad Sci, Inst Nucl Phys, IFJ PAN, PL-31342 Krakow, Poland

[11] Max Planck Inst Nucl Phys, Heidelberg, Germany

[12] Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Puebla, Mexico

[13] Univ Guadalajara, Ctr Univ Ciencias Exactase Ingn, Dept Fis, Guadalajara, Jalisco, Mexico

[14] Los Alamos Natl Lab, Div Phys, Los Alamos, NM USA

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

[16] Univ Libre Bruxelles, Interuniv Inst High Energies, Brussels, Belgium

[17] Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA

[18] NASA, Marshall Space Flight Ctr, Astrophys Off, Huntsville, AL USA

[19] Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City, DF, Mexico

[20] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

[21] Univ Politecn Pachuca, Pachuca, Hidalgo, Mexico

[22] Inst Politecn Nacl, Ctr Invest Comp, Mexico City, DF, Mexico

[23] Univ Nacl Autonoma Mexico, Inst Astron, Catedras Conacyt, Mexico City, DF, Mexico

[24] INFN, Via Marzolo 8, I-35131 Padua, Italy

[25] Univ Padua, Via Marzolo 8, I-35131 Padua, Italy

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

[27] IPN, Ctr Invest & Estudios Avanzados, Phys Dept, Mexico City, DF, Mexico

[28] Univ Autonoma Estado Hidalgo Pachuca, Pachuca, Mexico

[29] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City, DF, Mexico

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

[31] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

[32] Georgia Inst Technol, Ctr Relativist Astrophys, Atlanta, GA 30332 USA

[33] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 865卷 / 01期

基金：

美国国家科学基金会;

关键词：

astroparticle physics; cosmic rays; AIR-SHOWER ARRAY; ARRIVAL DIRECTIONS; INTENSITY; MILAGRO;

D O I：

10.3847/1538-4357/aad90c

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

After two years of operation, the High-Altitude Water Cherenkov (HAWC) Observatory has analyzed the TeV cosmic-ray sky over an energy range between 2.0 and 72.8 TeV. Like other detectors in the northern and southern hemispheres, HAWC observes an energy-dependent anisotropy in the arrival direction distribution of cosmic rays. This anisotropy is dominated by a dipole moment with phase in R.A. alpha approximate to 40 degrees and amplitude that slowly rises in relative intensity from 8 x 10(-4) at 2 TeV to 14 x 10(-4) around 30 TeV, above which the dipole decreases in strength. A significant large-scale (>60 degrees in angular extent) signal is also observed in the quadrupole and octupole moments, and significant small-scale features are also present, with locations and shapes consistent with previous observations. Compared to previous measurements in this energy range, the HAWC cosmic-ray sky maps improve on the energy resolution and fit precision of the anisotropy. These data can be used in an effort to better constrain local cosmic-ray accelerators and the intervening magnetic fields.

引用

页数：15

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