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
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.
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页数:15
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