Observation of small-scale anisotropy in the arrival direction distribution of TeV cosmic rays with HAWC

The HAWC Collaboration

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The High-Altitude Water Cherenkov (HAWC) Observatory is sensitive to gamma rays and charged cosmic rays at TeV energies. The detector is still under construction, but data acquisition with the partially deployed detector started in 2013. An analysis of the cosmic-ray arrival direction distribution based on 4.9 × 1010 events recorded between 2013 June and 2014 February shows anisotropy at the 10-4 level on angular scales of about 10°. The HAWC cosmic-ray sky map exhibits three regions of significantly enhanced cosmic-ray flux; two of these regions were first reported by the Milagro experiment. A third region coincides with an excess recently reported by the ARGO-YBJ experiment. An angular power spectrum analysis of the sky shows that all terms up to l = 15 contribute significantly to the excesses.

Original languageEnglish (US)
Article number796
JournalAstrophysical Journal
Volume796
Issue number2
DOIs
StatePublished - Dec 1 2014

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high altitude
cosmic ray
arrivals
cosmic rays
anisotropy
water
sky
detectors
data acquisition
spectrum analysis
power spectra
observatories
observatory
experiment
gamma rays
distribution
energy
detector
analysis

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

@article{8a6a15c02b61492d91dc2ac9a68949b6,
title = "Observation of small-scale anisotropy in the arrival direction distribution of TeV cosmic rays with HAWC",
abstract = "The High-Altitude Water Cherenkov (HAWC) Observatory is sensitive to gamma rays and charged cosmic rays at TeV energies. The detector is still under construction, but data acquisition with the partially deployed detector started in 2013. An analysis of the cosmic-ray arrival direction distribution based on 4.9 × 1010 events recorded between 2013 June and 2014 February shows anisotropy at the 10-4 level on angular scales of about 10°. The HAWC cosmic-ray sky map exhibits three regions of significantly enhanced cosmic-ray flux; two of these regions were first reported by the Milagro experiment. A third region coincides with an excess recently reported by the ARGO-YBJ experiment. An angular power spectrum analysis of the sky shows that all terms up to l = 15 contribute significantly to the excesses.",
author = "{The HAWC Collaboration} and Abeysekara, {A. U.} and R. Alfaro and C. Alvarez and {\'A}lvarez, {J. D.} and R. Arceo and Arteaga-Vel{\'a}zquez, {J. C.} and Solares, {H. A.Ayala} and Barber, {A. S.} and Baughman, {B. M.} and N. Bautista-Elivar and E. Belmont and BenZvi, {S. Y.} and D. Berley and Rosales, {M. Bonilla} and J. Braun and Caballero-Mora, {K. S.} and A. Carrami{\~n}ana and M. Castillo and U. Cotti and J. Cotzomi and {De La Fuente}, E. and {De L{\'e}on}, C. and T. DeYoung and Hernandez, {R. Diaz} and D{\'i}az-V{\'e}lez, {J. C.} and Dingus, {B. L.} and DuVernois, {M. A.} and Ellsworth, {R. W.} and Fiorino, {D. W.} and N. Fraija and A. Galindo and F. Garfias and Gonz{\'a}lez, {M. M.} and Goodman, {J. A.} and M. Gussert and Z. Hampel-Arias and Harding, {J. P.} and P. H{\"u}ntemeyer and Hui, {C. M.} and A. Imran and A. Iriarte and P. Karn and D. Kieda and Kunde, {G. J.} and A. Lara and Lauer, {R. J.} and Lee, {W. H.} and D. Lennarz and Mostafa, {Miguel Alejandro} and Pretz, {John Robert}",
year = "2014",
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doi = "10.1088/0004-637X/796/2/108",
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Observation of small-scale anisotropy in the arrival direction distribution of TeV cosmic rays with HAWC. / The HAWC Collaboration.

In: Astrophysical Journal, Vol. 796, No. 2, 796, 01.12.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observation of small-scale anisotropy in the arrival direction distribution of TeV cosmic rays with HAWC

AU - The HAWC Collaboration

AU - Abeysekara, A. U.

AU - Alfaro, R.

AU - Alvarez, C.

AU - Álvarez, J. D.

AU - Arceo, R.

AU - Arteaga-Velázquez, J. C.

AU - Solares, H. A.Ayala

AU - Barber, A. S.

AU - Baughman, B. M.

AU - Bautista-Elivar, N.

AU - Belmont, E.

AU - BenZvi, S. Y.

AU - Berley, D.

AU - Rosales, M. Bonilla

AU - Braun, J.

AU - Caballero-Mora, K. S.

AU - Carramiñana, A.

AU - Castillo, M.

AU - Cotti, U.

AU - Cotzomi, J.

AU - De La Fuente, E.

AU - De Léon, C.

AU - DeYoung, T.

AU - Hernandez, R. Diaz

AU - Díaz-Vélez, J. C.

AU - Dingus, B. L.

AU - DuVernois, M. A.

AU - Ellsworth, R. W.

AU - Fiorino, D. W.

AU - Fraija, N.

AU - Galindo, A.

AU - Garfias, F.

AU - González, M. M.

AU - Goodman, J. A.

AU - Gussert, M.

AU - Hampel-Arias, Z.

AU - Harding, J. P.

AU - Hüntemeyer, P.

AU - Hui, C. M.

AU - Imran, A.

AU - Iriarte, A.

AU - Karn, P.

AU - Kieda, D.

AU - Kunde, G. J.

AU - Lara, A.

AU - Lauer, R. J.

AU - Lee, W. H.

AU - Lennarz, D.

AU - Mostafa, Miguel Alejandro

AU - Pretz, John Robert

PY - 2014/12/1

Y1 - 2014/12/1

N2 - The High-Altitude Water Cherenkov (HAWC) Observatory is sensitive to gamma rays and charged cosmic rays at TeV energies. The detector is still under construction, but data acquisition with the partially deployed detector started in 2013. An analysis of the cosmic-ray arrival direction distribution based on 4.9 × 1010 events recorded between 2013 June and 2014 February shows anisotropy at the 10-4 level on angular scales of about 10°. The HAWC cosmic-ray sky map exhibits three regions of significantly enhanced cosmic-ray flux; two of these regions were first reported by the Milagro experiment. A third region coincides with an excess recently reported by the ARGO-YBJ experiment. An angular power spectrum analysis of the sky shows that all terms up to l = 15 contribute significantly to the excesses.

AB - The High-Altitude Water Cherenkov (HAWC) Observatory is sensitive to gamma rays and charged cosmic rays at TeV energies. The detector is still under construction, but data acquisition with the partially deployed detector started in 2013. An analysis of the cosmic-ray arrival direction distribution based on 4.9 × 1010 events recorded between 2013 June and 2014 February shows anisotropy at the 10-4 level on angular scales of about 10°. The HAWC cosmic-ray sky map exhibits three regions of significantly enhanced cosmic-ray flux; two of these regions were first reported by the Milagro experiment. A third region coincides with an excess recently reported by the ARGO-YBJ experiment. An angular power spectrum analysis of the sky shows that all terms up to l = 15 contribute significantly to the excesses.

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