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Title: A Search for Cosmic-Ray Proton Anisotropy with the Fermi Large Area Telescope
Authors: The Fermi-Lat Collaboration
M. Ajello
L. Baldini
G. Barbiellini
D. Bastieri
K. Bechtol
R. Bellazzini
E. Bissaldi
R. D. Blandford
R. Bonino
E. Bottacini
T. J. Brandt
P. Bruel
S. Buson
R. A. Cameron
R. Caputo
E. Cavazzuti
S. Chen
G. Chiaro
S. Ciprini
J. Cohen-Tanugi
D. Costantin
A. Cuoco
S. Cutini
F. D'Ammando
P. De La Torre Luque
F. De Palma
A. Desai
S. W. Digel
N. Di Lalla
L. Di Venere
A. Domínguez
S. J. Fegan
Y. Fukazawa
S. Funk
P. Fusco
F. Gargano
D. Gasparrini
N. Giglietto
F. Giordano
M. Giroletti
D. Green
I. A. Grenier
S. Guiriec
K. Hayashi
E. Hays
J. W. Hewitt
D. Horan
G. Jóhannesson
M. Kuss
L. Latronico
J. Li
I. Liodakis
F. Longo
F. Loparco
P. Lubrano
S. Maldera
A. Manfreda
G. Martí-Devesa
M. N. Mazziotta
M. Meehan
I. Mereu
M. Meyer
P. F. Michelson
N. Mirabal
W. Mitthumsiri
T. Mizuno
A. Morselli
M. Negro
E. Nuss
N. Omodei
M. Orienti
E. Orlando
V. S. Paliya
D. Paneque
M. Persic
M. Pesce-Rollins
F. Piron
T. A. Porter
G. Principe
S. Rainò
R. Rando
M. Razzano
S. Razzaque
A. Reimer
O. Reimer
D. Serini
C. Sgrò
E. J. Siskind
G. Spandre
P. Spinelli
D. J. Suson
H. Tajima
J. B. Thayer
D. F. Torres
E. Troja
J. Vandenbroucke
M. Yassine
S. Zimmer
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Laboratoire Univers et Particules de Montpellier
Universite Paris-Saclay
Laboratoire Leprince-Ringuet
Kavli Institute for Particle Astrophysics and Cosmology
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
NYCB Realtime Computing Inc.
University Science Institute Reykjavik
Institució Catalana de Recerca i Estudis Avançats
University of Wisconsin-Madison
Agenzia Spaziale Italiana
Hiroshima University
Deutsches Elektronen-Synchrotron (DESY)
Osservatorio Astronomico di Trieste
Stockholms universitet
Alma Mater Studiorum Università di Bologna
Universidad Complutense de Madrid
Clemson University
University of Maryland, Baltimore County
Universitat Autònoma de Barcelona
Università degli Studi di Bari
Istituto Nazionale di Fisica Nucleare - INFN
University of Maryland
Purdue University Calumet
Università degli Studi di Trieste
Rheinisch-Westfälische Technische Hochschule Aachen
Mahidol University
Julius-Maximilians-Universität Würzburg
Istituto Di Radioastronomia, Bologna
Università degli Studi di Torino
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)
Medizinische Universitat Innsbruck
NASA Goddard Space Flight Center
Université de Genève
The George Washington University
Università degli Studi di Perugia
Friedrich-Alexander-Universität Erlangen-Nürnberg
University of Johannesburg
Università degli Studi di Padova
Nagoya University
University of North Florida
Keywords: Earth and Planetary Sciences
Issue Date: 20-Sep-2019
Citation: Astrophysical Journal. Vol.883, No.1 (2019)
Abstract: © 2019. The American Astronomical Society. All rights reserved. The Fermi Large Area Telescope (LAT) has amassed a large data set of primary cosmic-ray protons throughout its mission. In fact, it is the largest set of identified cosmic-ray protons ever collected at this energy. The LAT's wide field of view and full-sky survey capabilities make it an excellent instrument for studying cosmic-ray anisotropy. As a space-based survey instrument, the LAT is sensitive to anisotropy in both R.A. and decl., while ground-based observations only measure the anisotropy in R.A. We present the results of the first-ever proton anisotropy search using Fermi LAT. The data set was collected over eight years and consists of approximately 179 million protons above 78 GeV, enabling it to probe dipole anisotropy below an amplitude of 10-3, resulting in the most stringent limits on the decl. dependence of the dipole to date. We measure a dipole amplitude δ = 3.9 ±1.5 ×10-4 with a p-value of 0.01 (pretrials) for protons with energy greater than 78 GeV. We discuss various systematic effects that could give rise to a dipole excess and calculate upper limits on the dipole amplitude as a function of minimum energy. The 95% confidence level upper limit on the dipole amplitude is δ UL = 1.3 ×10-3 for protons with energy greater than 78 GeV and δ UL = 1.2 ×10-3 for protons with energy greater than 251 GeV.
ISSN: 15384357
Appears in Collections:Scopus 2019

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