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

A. U. Abeysekara; R. Alfaro; C. Alvarez; J. D. Alvarez; R. Arceo; J. C. Arteaga-Velázquez; D. Avila Rojas; H. A.Ayala Solares; A. Becerril; E. Belmont-Moreno; S. Y. Benzvi; A. Bernal; J. Braun; K. S. Caballero-Mora; T. Capistrán; A. Carraminana; S. Casanova; M. Castillo; U. Cotti; J. Cotzomi; C. De León; E. De La Fuente; R. Diaz Hernandez; S. Dichiara; B. L. Dingus; M. A. Duvernois; J. C. Diaz-Vélez; K. Engel; D. W. Fiorino; N. Fraija; J. A. Garcia-González; F. Garfias; A. González Munoz; M. M. González; J. A. Goodman; Z. Hampel-Arias; J. P. Harding; S. Hernandez; B. Hona; F. Hueyotl-Zahuantitla; C. M. Hui; P. Hüntemeyer; A. Iriarte; A. Jardin-Blicq; V. Joshi; S. Kaufmann; A. Lara; R. J. Lauer; W. H. Lee; H. León Vargas; A. L. Longinotti; G. Luis-Raya; R. Luna-Garcia; D. López-Cámara; R. López-Coto; D. López-Cámara; K. Malone; S. S. Marinelli; O. Martinez; I. Martinez-Castellanos; J. Martinez-Castro; H. Martinez-Huerta; J. A. Matthews; P. Miranda-Romagnoli; E. Moreno; M. Mostafá; A. Nayerhoda; L. Nellen; M. Newbold; M. U. Nisa; R. Noriega-Papaqui; R. Pelayo; J. Pretz; E. G. Pérez-Pérez; Z. Ren; C. D. Rho; C. Riviere; D. Rosa-González; M. Rosenberg; E. Ruiz-Velasco; F. Salesa Greus; A. Sandoval; M. Schneider; H. Schoorlemmer; M. Seglar Arroyo; G. Sinnis; A. J. Smith; R. W. Springer; P. Surajbali; I. Taboada; O. Tibolla; K. Tollefson; I. Torres; G. Vianello; L. Villasenor; T. Weisgarber; F. Werner; S. Westerhoff; J. Wood; T. Yapici; A. Zepeda; H. Zhou

doi:10.3847/1538-4357/aad90c

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

A. U. Abeysekara, R. Alfaro, C. Alvarez, J. D. Alvarez, R. Arceo, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A.Ayala Solares, A. Becerril, E. Belmont-Moreno, S. Y. Benzvi, A. Bernal, J. Braun, K. S. Caballero-Mora, T. Capistrán, A. Carraminana, S. Casanova, M. Castillo, U. Cotti, J. CotzomiC. De León, E. De La Fuente, R. Diaz Hernandez, S. Dichiara, B. L. Dingus, M. A. Duvernois, J. C. Diaz-Vélez, K. Engel, D. W. Fiorino, N. Fraija, J. A. Garcia-González, F. Garfias, A. González Munoz, M. M. González, J. A. Goodman, Z. Hampel-Arias, J. P. Harding, S. Hernandez, B. Hona, F. Hueyotl-Zahuantitla, C. M. Hui, P. Hüntemeyer, A. Iriarte, A. Jardin-Blicq, V. Joshi, S. Kaufmann, A. Lara, R. J. Lauer, W. H. Lee, H. León Vargas, A. L. Longinotti, G. Luis-Raya, R. Luna-Garcia, D. López-Cámara, R. López-Coto, D. López-Cámara, K. Malone, S. S. Marinelli, O. Martinez, I. Martinez-Castellanos, J. Martinez-Castro, H. Martinez-Huerta, J. A. Matthews, P. Miranda-Romagnoli, E. Moreno, M. Mostafá, A. Nayerhoda, L. Nellen, M. Newbold, M. U. Nisa, R. Noriega-Papaqui, R. Pelayo, J. Pretz, E. G. Pérez-Pérez, Z. Ren, C. D. Rho, C. Riviere, D. Rosa-González, M. Rosenberg, E. Ruiz-Velasco, F. Salesa Greus, A. Sandoval, M. Schneider, H. Schoorlemmer, M. Seglar Arroyo, G. Sinnis, A. J. Smith, R. W. Springer, P. Surajbali, I. Taboada, O. Tibolla, K. Tollefson, I. Torres, G. Vianello, L. Villasenor, T. Weisgarber, F. Werner, S. Westerhoff, J. Wood, T. Yapici, A. Zepeda, H. Zhou

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Abstract

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. α ≈ 40° and amplitude that slowly rises in relative intensity from 8 ×10^-4 at 2 TeV to 14 ×10^-4 around 30 TeV, above which the dipole decreases in strength. A significant large-scale (>60° 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.

Original language	English
Article number	57
Pages (from-to)	57
Journal	Astrophysical Journal
Volume	865
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aad90c
Publication status	Published - 20 Sept 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/aad90c

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Abeysekara, A. U., Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., Rojas, D. A., Solares, H. A. A., Becerril, A., Belmont-Moreno, E., Benzvi, S. Y., Bernal, A., Braun, J., Caballero-Mora, K. S., Capistrán, T., Carraminana, A., Casanova, S., Castillo, M., Cotti, U., ... Zhou, H. (2018). Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC. Astrophysical Journal, 865(1), 57. Article 57. https://doi.org/10.3847/1538-4357/aad90c

@article{2eee17c921a949d6ab9abf7a9016f74f,

title = "Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC",

abstract = "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. α ≈ 40° and amplitude that slowly rises in relative intensity from 8 ×10-4 at 2 TeV to 14 ×10-4 around 30 TeV, above which the dipole decreases in strength. A significant large-scale (>60° 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.",

author = "Abeysekara, {A. U.} and R. Alfaro and C. Alvarez and Alvarez, {J. D.} and R. Arceo and Arteaga-Vel{\'a}zquez, {J. C.} and Rojas, {D. Avila} and Solares, {H. A.Ayala} and A. Becerril and E. Belmont-Moreno and Benzvi, {S. Y.} and A. Bernal and J. Braun and Caballero-Mora, {K. S.} and T. Capistr{\'a}n and A. Carraminana and S. Casanova and M. Castillo and U. Cotti and J. Cotzomi and Le{\'o}n, {C. De} and Fuente, {E. De La} and Hernandez, {R. Diaz} and S. Dichiara and Dingus, {B. L.} and Duvernois, {M. A.} and Diaz-V{\'e}lez, {J. C.} and K. Engel and Fiorino, {D. W.} and N. Fraija and Garcia-Gonz{\'a}lez, {J. A.} and F. Garfias and Munoz, {A. Gonz{\'a}lez} and Gonz{\'a}lez, {M. M.} and Goodman, {J. A.} and Z. Hampel-Arias and Harding, {J. P.} and S. Hernandez and B. Hona and F. Hueyotl-Zahuantitla and Hui, {C. M.} and P. H{\"u}ntemeyer and A. Iriarte and A. Jardin-Blicq and V. Joshi and S. Kaufmann and A. Lara and Lauer, {R. J.} and Lee, {W. H.} and Vargas, {H. Le{\'o}n} and Longinotti, {A. L.} and G. Luis-Raya and R. Luna-Garcia and D. L{\'o}pez-C{\'a}mara and R. L{\'o}pez-Coto and D. L{\'o}pez-C{\'a}mara and K. Malone and Marinelli, {S. S.} and O. Martinez and I. Martinez-Castellanos and J. Martinez-Castro and H. Martinez-Huerta and Matthews, {J. A.} and P. Miranda-Romagnoli and E. Moreno and M. Mostaf{\'a} and A. Nayerhoda and L. Nellen and M. Newbold and Nisa, {M. U.} and R. Noriega-Papaqui and R. Pelayo and J. Pretz and P{\'e}rez-P{\'e}rez, {E. G.} and Z. Ren and Rho, {C. D.} and C. Riviere and D. Rosa-Gonz{\'a}lez and M. Rosenberg and E. Ruiz-Velasco and Greus, {F. Salesa} and A. Sandoval and M. Schneider and H. Schoorlemmer and Arroyo, {M. Seglar} and G. Sinnis and Smith, {A. J.} and Springer, {R. W.} and P. Surajbali and I. Taboada and O. Tibolla and K. Tollefson and I. Torres and G. Vianello and L. Villasenor and T. Weisgarber and F. Werner and S. Westerhoff and J. Wood and T. Yapici and A. Zepeda and H. Zhou",

year = "2018",

month = sep,

day = "20",

doi = "10.3847/1538-4357/aad90c",

language = "English",

volume = "865",

pages = "57",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

}

Abeysekara, AU, Alfaro, R, Alvarez, C, Alvarez, JD, Arceo, R, Arteaga-Velázquez, JC, Rojas, DA, Solares, HAA, Becerril, A, Belmont-Moreno, E, Benzvi, SY, Bernal, A, Braun, J, Caballero-Mora, KS, Capistrán, T, Carraminana, A, Casanova, S, Castillo, M, Cotti, U, Cotzomi, J, León, CD, Fuente, EDL, Hernandez, RD, Dichiara, S, Dingus, BL, Duvernois, MA, Diaz-Vélez, JC, Engel, K, Fiorino, DW, Fraija, N, Garcia-González, JA, Garfias, F, Munoz, AG, González, MM, Goodman, JA, Hampel-Arias, Z, Harding, JP, Hernandez, S, Hona, B, Hueyotl-Zahuantitla, F, Hui, CM, Hüntemeyer, P, Iriarte, A, Jardin-Blicq, A, Joshi, V, Kaufmann, S, Lara, A, Lauer, RJ, Lee, WH, Vargas, HL, Longinotti, AL, Luis-Raya, G, Luna-Garcia, R, López-Cámara, D, López-Coto, R, López-Cámara, D, Malone, K, Marinelli, SS, Martinez, O, Martinez-Castellanos, I, Martinez-Castro, J, Martinez-Huerta, H, Matthews, JA, Miranda-Romagnoli, P, Moreno, E, Mostafá, M, Nayerhoda, A, Nellen, L, Newbold, M, Nisa, MU, Noriega-Papaqui, R, Pelayo, R, Pretz, J, Pérez-Pérez, EG, Ren, Z, Rho, CD, Riviere, C, Rosa-González, D, Rosenberg, M, Ruiz-Velasco, E, Greus, FS, Sandoval, A, Schneider, M, Schoorlemmer, H, Arroyo, MS, Sinnis, G, Smith, AJ, Springer, RW, Surajbali, P, Taboada, I, Tibolla, O, Tollefson, K, Torres, I, Vianello, G, Villasenor, L, Weisgarber, T, Werner, F, Westerhoff, S, Wood, J, Yapici, T, Zepeda, A & Zhou, H 2018, 'Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC', Astrophysical Journal, vol. 865, no. 1, 57, pp. 57. https://doi.org/10.3847/1538-4357/aad90c

TY - JOUR

T1 - Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC

AU - Abeysekara, A. U.

AU - Alfaro, R.

AU - Alvarez, C.

AU - Alvarez, J. D.

AU - Arceo, R.

AU - Arteaga-Velázquez, J. C.

AU - Rojas, D. Avila

AU - Solares, H. A.Ayala

AU - Becerril, A.

AU - Belmont-Moreno, E.

AU - Benzvi, S. Y.

AU - Bernal, A.

AU - Braun, J.

AU - Caballero-Mora, K. S.

AU - Capistrán, T.

AU - Carraminana, A.

AU - Casanova, S.

AU - Castillo, M.

AU - Cotti, U.

AU - Cotzomi, J.

AU - León, C. De

AU - Fuente, E. De La

AU - Hernandez, R. Diaz

AU - Dichiara, S.

AU - Dingus, B. L.

AU - Duvernois, M. A.

AU - Diaz-Vélez, J. C.

AU - Engel, K.

AU - Fiorino, D. W.

AU - Fraija, N.

AU - Garcia-González, J. A.

AU - Garfias, F.

AU - Munoz, A. González

AU - González, M. M.

AU - Goodman, J. A.

AU - Hampel-Arias, Z.

AU - Harding, J. P.

AU - Hernandez, S.

AU - Hona, B.

AU - Hueyotl-Zahuantitla, F.

AU - Hui, C. M.

AU - Hüntemeyer, P.

AU - Iriarte, A.

AU - Jardin-Blicq, A.

AU - Joshi, V.

AU - Kaufmann, S.

AU - Lara, A.

AU - Lauer, R. J.

AU - Lee, W. H.

AU - Vargas, H. León

AU - Longinotti, A. L.

AU - Luis-Raya, G.

AU - Luna-Garcia, R.

AU - López-Cámara, D.

AU - López-Coto, R.

AU - López-Cámara, D.

AU - Malone, K.

AU - Marinelli, S. S.

AU - Martinez, O.

AU - Martinez-Castellanos, I.

AU - Martinez-Castro, J.

AU - Martinez-Huerta, H.

AU - Matthews, J. A.

AU - Miranda-Romagnoli, P.

AU - Moreno, E.

AU - Mostafá, M.

AU - Nayerhoda, A.

AU - Nellen, L.

AU - Newbold, M.

AU - Nisa, M. U.

AU - Noriega-Papaqui, R.

AU - Pelayo, R.

AU - Pretz, J.

AU - Pérez-Pérez, E. G.

AU - Ren, Z.

AU - Rho, C. D.

AU - Riviere, C.

AU - Rosa-González, D.

AU - Rosenberg, M.

AU - Ruiz-Velasco, E.

AU - Greus, F. Salesa

AU - Sandoval, A.

AU - Schneider, M.

AU - Schoorlemmer, H.

AU - Arroyo, M. Seglar

AU - Sinnis, G.

AU - Smith, A. J.

AU - Springer, R. W.

AU - Surajbali, P.

AU - Taboada, I.

AU - Tibolla, O.

AU - Tollefson, K.

AU - Torres, I.

AU - Vianello, G.

AU - Villasenor, L.

AU - Weisgarber, T.

AU - Werner, F.

AU - Westerhoff, S.

AU - Wood, J.

AU - Yapici, T.

AU - Zepeda, A.

AU - Zhou, H.

PY - 2018/9/20

Y1 - 2018/9/20

N2 - 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. α ≈ 40° and amplitude that slowly rises in relative intensity from 8 ×10-4 at 2 TeV to 14 ×10-4 around 30 TeV, above which the dipole decreases in strength. A significant large-scale (>60° 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.

AB - 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. α ≈ 40° and amplitude that slowly rises in relative intensity from 8 ×10-4 at 2 TeV to 14 ×10-4 around 30 TeV, above which the dipole decreases in strength. A significant large-scale (>60° 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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UR - http://www.scopus.com/inward/citedby.url?scp=85053925000&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aad90c

DO - 10.3847/1538-4357/aad90c

M3 - Article

AN - SCOPUS:85053925000

SN - 0004-637X

VL - 865

SP - 57

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 57

ER -

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

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