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All-sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field
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Abeysekara_2019_ApJ_871_96.pdf
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2.06 MB
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Adobe PDF
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634580bdf4bd79922c8146d8c1d132fd
Journal
The Astrophysical Journal
Citation
Abeysekara, A. U., R. Alfaro, C. Alvarez, R. Arceo, J. C. Arteaga-Velázquez, D. Avila Rojas, E. Belmont-Moreno, et al. “All-Sky Measurement of the Anisotropy of Cosmic Rays at 10 TeV and Mapping of the Local Interstellar Magnetic Field.” The Astrophysical Journal 871, no. 1 (January 24, 2019): 96. doi:10.3847/1538-4357/aaf5cc.
Version
Final published version
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 .
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DOI of Published Version
http://dx.doi.org/10.3847/1538-4357/aaf5cc
