Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande

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Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande. / Ahlers, Markus.

I: Astrophysics Journal Letters, Bind 886, Nr. 1, L18, 19.09.2019.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Harvard

Ahlers, M 2019, 'Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande', Astrophysics Journal Letters, bind 886, nr. 1, L18. https://doi.org/10.3847/2041-8213/ab552f

APA

Ahlers, M. (2019). Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande. Astrophysics Journal Letters, 886(1), [L18]. https://doi.org/10.3847/2041-8213/ab552f

Vancouver

Ahlers M. Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande. Astrophysics Journal Letters. 2019 sep. 19;886(1). L18. https://doi.org/10.3847/2041-8213/ab552f

Author

Ahlers, Markus. / Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande. I: Astrophysics Journal Letters. 2019 ; Bind 886, Nr. 1.

Bibtex

@article{6c92358c7524491193d6345cf300698d,
title = "Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande",
abstract = " We search for anisotropies in the arrival directions of cosmic rays observed by the KASCADE-Grande air shower experiment. The analysis is based on public data of about 23.7 million events with reconstructed primary energies above 1 PeV. We apply a novel maximum-likelihood reconstruction method for the cosmic ray anisotropy, that compensates for spurious anisotropies induced by local detector effects. We find no evidence for a large-scale dipole anisotropy in the data, consistent with official results based on the conventional East-West derivative method. On the other hand, a subset of cosmic rays with median energy of 33 PeV shows strong evidence for a medium-scale feature with an angular diameter of 40 degrees. After accounting for the look-elsewhere effect, the post-trial significance of this medium-scale feature is at the level of 4sigma. ",
keywords = "astro-ph.HE, hep-ex, hep-ph",
author = "Markus Ahlers",
note = "6 pages, 4 figures",
year = "2019",
month = sep,
day = "19",
doi = "10.3847/2041-8213/ab552f",
language = "English",
volume = "886",
journal = "The Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing",
number = "1",

}

RIS

TY - JOUR

T1 - Large- and Medium-Scale Anisotropies in the Arrival Directions of Cosmic Rays observed with KASCADE-Grande

AU - Ahlers, Markus

N1 - 6 pages, 4 figures

PY - 2019/9/19

Y1 - 2019/9/19

N2 - We search for anisotropies in the arrival directions of cosmic rays observed by the KASCADE-Grande air shower experiment. The analysis is based on public data of about 23.7 million events with reconstructed primary energies above 1 PeV. We apply a novel maximum-likelihood reconstruction method for the cosmic ray anisotropy, that compensates for spurious anisotropies induced by local detector effects. We find no evidence for a large-scale dipole anisotropy in the data, consistent with official results based on the conventional East-West derivative method. On the other hand, a subset of cosmic rays with median energy of 33 PeV shows strong evidence for a medium-scale feature with an angular diameter of 40 degrees. After accounting for the look-elsewhere effect, the post-trial significance of this medium-scale feature is at the level of 4sigma.

AB - We search for anisotropies in the arrival directions of cosmic rays observed by the KASCADE-Grande air shower experiment. The analysis is based on public data of about 23.7 million events with reconstructed primary energies above 1 PeV. We apply a novel maximum-likelihood reconstruction method for the cosmic ray anisotropy, that compensates for spurious anisotropies induced by local detector effects. We find no evidence for a large-scale dipole anisotropy in the data, consistent with official results based on the conventional East-West derivative method. On the other hand, a subset of cosmic rays with median energy of 33 PeV shows strong evidence for a medium-scale feature with an angular diameter of 40 degrees. After accounting for the look-elsewhere effect, the post-trial significance of this medium-scale feature is at the level of 4sigma.

KW - astro-ph.HE

KW - hep-ex

KW - hep-ph

U2 - 10.3847/2041-8213/ab552f

DO - 10.3847/2041-8213/ab552f

M3 - Journal article

VL - 886

JO - The Astrophysical Journal Letters

JF - The Astrophysical Journal Letters

SN - 2041-8205

IS - 1

M1 - L18

ER -

ID: 230898696