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

Abeysekara, AU(University of Utah), R. Alfaro(Universidad Nacional Autónoma de México), C. Álvarez(Universidad Autónoma de Chiapas), Álvarez, JD(Universidad Michoacana de San Nicolás de Hidalgo), R. Arceo(Universidad Autónoma de Chiapas), Arteaga-Velázquez, JC(Universidad Michoacana de San Nicolás de Hidalgo), Solares, HAA(Michigan Technological University), Barber, AS(University of Utah), Baughman, BM(University of Maryland, College Park), N. Bautista-Elivar(Universidad Politécnica de Pachuca), E. Belmont(Universidad Nacional Autónoma de México), BenZvi, SY(University of Wisconsin–Madison), D. Berley(University of Maryland, College Park), Rosales, MB(National Institute of Astrophysics, Optics and Electronics), J. Braun(University of Wisconsin–Madison), Caballero-Mora, KS(Instituto Politécnico Nacional), Carramiñana, A(National Institute of Astrophysics, Optics and Electronics), M. Castillo(Benemérita Universidad Autónoma de Puebla), U. Cotti(Universidad Michoacana de San Nicolás de Hidalgo), J. Cotzomi(Benemérita Universidad Autónoma de Puebla), E. De la Fuente(Universidad de Guadalajara), De Léon, C(Universidad Michoacana de San Nicolás de Hidalgo), T. DeYoung(Michigan State University), Hernandez, RD(National Institute of Astrophysics, Optics and Electronics), Díaz-Vélez, JC(University of Wisconsin–Madison), Dingus, BL(Los Alamos National Laboratory), DuVernois, MA(University of Wisconsin–Madison), Ellsworth, RW(George Mason University), Fiorino, DW(University of Wisconsin–Madison), N. Fraija(Universidad Nacional Autónoma de México), A. Galindo(National Institute of Astrophysics, Optics and Electronics), F. Garfias(Universidad Nacional Autónoma de México), González, MM(Universidad Nacional Autónoma de México), Goodman, JA(University of Maryland, College Park), M. Gussert(Colorado State University), Z. Hampel-Arias(University of Wisconsin–Madison), Harding, JP(Los Alamos National Laboratory), Hüntemeyer, P(Michigan Technological University), Hui, CM(Michigan Technological University), Asif Imran(Los Alamos National Laboratory), A. Iriarte(Universidad Nacional Autónoma de México), P. Karn(University of Wisconsin–Madison), D. Kieda(University of Utah), Kunde, GJ(Los Alamos National Laboratory), A. Lara(Universidad Nacional Autónoma de México), Lauer, RJ(University of New Mexico), Lee, WH(Universidad Nacional Autónoma de México), D. Lennarz(Georgia Institute of Technology), Vargas, HL(Universidad Nacional Autónoma de México), Linnemann, JT(Michigan State University), M. Longo(Colorado State University), Luna-García, R(Instituto Politécnico Nacional), K. Malone(Pennsylvania State University), A. Marinelli(Universidad Nacional Autónoma de México), Marinelli, SS(Michigan State University), H. Martínez(Instituto Politécnico Nacional), O. Martı́nez(Benemérita Universidad Autónoma de Puebla), Martínez-Castro, J(Instituto Politécnico Nacional), Matthews, JAJ(University of New Mexico), J. McEnery(Goddard Space Flight Center), Torres, EM(National Institute of Astrophysics, Optics and Electronics), P. Miranda-Romagnoli(Universidad Autónoma del Estado de Hidalgo), E. Moreno, Mostafá, M(Pennsylvania State University), L. Nellen(Universidad Nacional Autónoma de México), M. Newbold, R. Noriega-Papaqui, T. Oceguera-Becerra(Universidad de Guadalajara), B. Patricelli(Universidad Nacional Autónoma de México), Rodrigo Pelayo(Instituto Politécnico Nacional), Pérez-Pérez, EG(Universidad Politécnica de Pachuca), J. Pretz, Rivìre, C(University of Maryland, College Park), Rosa-González, D, E. Ruiz-Velasco, J. M. Ryan(University of New Hampshire), H. Salazar, Greus, FS, A. Sandoval, M. Schneider(University of California, Santa Cruz), G. Sinnis(Los Alamos National Laboratory), Smith, AJ, Sparks Woodle, K, Springer, RW, I. Taboada(Georgia Institute of Technology), Toale, PA(University of Alabama), Kirsten Tollefson, I. Torres, Ukwatta, TN, Villaseñor, L
eScholarship (California Digital Library)
December 1, 2014
Cited by 86

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.

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