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, R. López-Coto, 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

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 languageEnglish (US)
Article number57
JournalAstrophysical Journal
Volume865
Issue number1
DOIs
StatePublished - Sep 20 2018

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high altitude
cosmic ray
cosmic rays
anisotropy
water
energy
sky
Southern Hemisphere
Northern Hemisphere
arrivals
observatories
dipole moments
accelerators
observatory
quadrupoles
dipoles
magnetic field
moments
detectors
magnetic fields

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Abeysekara, A. U., Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velázquez, J. C., ... Zhou, H. (2018). Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC. Astrophysical Journal, 865(1), [57]. https://doi.org/10.3847/1538-4357/aad90c
Abeysekara, A. U. ; Alfaro, R. ; Alvarez, C. ; Alvarez, J. D. ; Arceo, R. ; Arteaga-Velázquez, J. C. ; Rojas, D. Avila ; Solares, H. A.Ayala ; 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. ; Cotzomi, J. ; León, C. De ; Fuente, E. De La ; Hernandez, R. Diaz ; Dichiara, S. ; Dingus, B. L. ; Duvernois, M. A. ; Diaz-Vélez, J. C. ; Engel, K. ; Fiorino, D. W. ; Fraija, N. ; Garcia-González, J. A. ; Garfias, F. ; Munoz, A. González ; González, M. M. ; Goodman, J. A. ; Hampel-Arias, Z. ; Harding, J. P. ; Hernandez, S. ; Hona, B. ; Hueyotl-Zahuantitla, F. ; Hui, C. M. ; Hüntemeyer, P. ; Iriarte, A. ; Jardin-Blicq, A. ; Joshi, V. ; Kaufmann, S. ; Lara, A. ; Lauer, R. J. ; Lee, W. H. ; Vargas, H. León ; Longinotti, A. L. ; Luis-Raya, G. ; Luna-Garcia, R. ; López-Cámara, D. ; López-Coto, R. ; López-Cámara, D. ; López-Coto, R. ; Malone, K. ; Marinelli, S. S. ; Martinez, O. ; Martinez-Castellanos, I. ; Martinez-Castro, J. ; Martinez-Huerta, H. ; Matthews, J. A. ; Miranda-Romagnoli, P. ; Moreno, E. ; Mostafá, M. ; Nayerhoda, A. ; Nellen, L. ; Newbold, M. ; Nisa, M. U. ; Noriega-Papaqui, R. ; Pelayo, R. ; Pretz, J. ; Pérez-Pérez, E. G. ; Ren, Z. ; Rho, C. D. ; Riviere, C. ; Rosa-González, D. ; Rosenberg, M. ; Ruiz-Velasco, E. ; Greus, F. Salesa ; Sandoval, A. ; Schneider, M. ; Schoorlemmer, H. ; Arroyo, M. Seglar ; Sinnis, G. ; Smith, A. J. ; Springer, R. W. ; 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. / Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC. In: Astrophysical Journal. 2018 ; Vol. 865, No. 1.
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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.",
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 R. L{\'o}pez-Coto 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",
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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, López-Coto, R, 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. https://doi.org/10.3847/1538-4357/aad90c

Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC. / Abeysekara, A. U.; Alfaro, R.; Alvarez, C.; Alvarez, J. D.; Arceo, R.; Arteaga-Velázquez, J. C.; Rojas, D. Avila; Solares, H. A.Ayala; 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.; Cotzomi, J.; León, C. De; Fuente, E. De La; Hernandez, R. Diaz; Dichiara, S.; Dingus, B. L.; Duvernois, M. A.; Diaz-Vélez, J. C.; Engel, K.; Fiorino, D. W.; Fraija, N.; Garcia-González, J. A.; Garfias, F.; Munoz, A. González; González, M. M.; Goodman, J. A.; Hampel-Arias, Z.; Harding, J. P.; Hernandez, S.; Hona, B.; Hueyotl-Zahuantitla, F.; Hui, C. M.; Hüntemeyer, P.; Iriarte, A.; Jardin-Blicq, A.; Joshi, V.; Kaufmann, S.; Lara, A.; Lauer, R. J.; Lee, W. H.; Vargas, H. León; Longinotti, A. L.; Luis-Raya, G.; Luna-Garcia, R.; López-Cámara, D.; López-Coto, R.; López-Cámara, D.; López-Coto, R.; Malone, K.; Marinelli, S. S.; Martinez, O.; Martinez-Castellanos, I.; Martinez-Castro, J.; Martinez-Huerta, H.; Matthews, J. A.; Miranda-Romagnoli, P.; Moreno, E.; Mostafá, M.; Nayerhoda, A.; Nellen, L.; Newbold, M.; Nisa, M. U.; Noriega-Papaqui, R.; Pelayo, R.; Pretz, J.; Pérez-Pérez, E. G.; Ren, Z.; Rho, C. D.; Riviere, C.; Rosa-González, D.; Rosenberg, M.; Ruiz-Velasco, E.; Greus, F. Salesa; Sandoval, A.; Schneider, M.; Schoorlemmer, H.; Arroyo, M. Seglar; Sinnis, G.; Smith, A. J.; Springer, R. W.; 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.

In: Astrophysical Journal, Vol. 865, No. 1, 57, 20.09.2018.

Research output: Contribution to journalArticle

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 - López-Coto, R.

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.

UR - http://www.scopus.com/inward/record.url?scp=85053925000&partnerID=8YFLogxK

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

VL - 865

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 57

ER -

Abeysekara AU, Alfaro R, Alvarez C, Alvarez JD, Arceo R, Arteaga-Velázquez JC et al. Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC. Astrophysical Journal. 2018 Sep 20;865(1). 57. https://doi.org/10.3847/1538-4357/aad90c