Title

All-sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field

Authors

Hawc Collaboration
Icecube Collaboration
A. U. Abeysekara, The University of Utah
R. Alfaro, Universidad Nacional Autónoma de México
C. Alvarez, Universidad Autónoma de Chiapas
R. Arceo, Universidad Autónoma de Chiapas
J. C. Arteaga-Velázquez, Universidad Michoacana de San Nicolás de Hidalgo
D. Avila Rojas, Universidad Nacional Autónoma de México
E. Belmont-Moreno, Universidad Nacional Autónoma de México
S. Y. Benzvi, University of Rochester
C. Brisbois, Michigan Technological University
T. Capistrán, Instituto Nacional de Astrofisica Optica y Electronica
A. Carramiana, Instituto Nacional de Astrofisica Optica y Electronica
S. Casanova, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
U. Cotti, Universidad Michoacana de San Nicolás de Hidalgo
J. Cotzomi, Benemerita Universidad Autonoma de Puebla
J. C. Diaz-Vélez, Universidad de Guadalajara
C. De León, Benemerita Universidad Autonoma de Puebla
E. De La Fuente, Universidad de Guadalajara
S. Dichiara, Universidad Nacional Autónoma de México
M. A. Duvernois, University of Wisconsin-Madison
C. Espinoza, Universidad Nacional Autónoma de México
D. W. Fiorino, University of Maryland
H. Fleischhack, Michigan Technological University
N. Fraija, Universidad Nacional Autónoma de México
A. Galván-Gámez, Universidad Nacional Autónoma de México
J. A. Garcia-González, Universidad Nacional Autónoma de México
M. M. González, Universidad Nacional Autónoma de México
J. A. Goodman, University of Maryland
Z. Hampel-Arias, University of Wisconsin-Madison
J. P. Harding, Los Alamos National Laboratory
S. Hernandez, Universidad Nacional Autónoma de México

Document Type

Article

Publication Date

1-20-2019

Abstract

© 2019. The American Astronomical Society. All rights reserved. We present the first full-sky analysis of the cosmic ray arrival direction distribution with data collected by the High-Altitude Water Cherenkov and IceCube observatories in the northern and southern hemispheres at the same median primary particle energy of 10 TeV. The combined sky map and angular power spectrum largely eliminate biases that result from partial sky coverage and present a key to probe into the propagation properties of TeV cosmic rays through our local interstellar medium and the interaction between the interstellar and heliospheric magnetic fields. From the map, we determine the horizontal dipole components of the anisotropy δ 0h = 9.16 ×10 -4 and δ 6h = 7.25 ×10 -4 (±0.04 × 10 -4 ). In addition, we infer the direction (229.°2 ± 3.°5 R.A., 11.°4 ± 3.°0 decl.) of the interstellar magnetic field from the boundary between large-scale excess and deficit regions from which we estimate the missing corresponding vertical dipole component of the large-scale anisotropy to be δN ∼ -3.97 +1.0-2.0 × 10 -4 .

Publication Title

Astrophysical Journal

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