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Title: The Fermi Galactic Center GeV Excess and Implications for Dark Matter
Authors: M. Ackermann
M. Ajello
A. Albert
W. B. Atwood
L. Baldini
J. Ballet
G. Barbiellini
D. Bastieri
R. Bellazzini
E. Bissaldi
R. D. Blandford
E. D. Bloom
R. Bonino
E. Bottacini
T. J. Brandt
J. Bregeon
P. Bruel
R. Buehler
T. H. Burnett
R. A. Cameron
R. Caputo
M. Caragiulo
P. A. Caraveo
E. Cavazzuti
C. Cecchi
E. Charles
A. Chekhtman
J. Chiang
A. Chiappo
G. Chiaro
S. Ciprini
J. Conrad
F. Costanza
A. Cuoco
S. Cutini
F. D'Ammando
F. De Palma
R. Desiante
S. W. Digel
N. Di Lalla
M. Di Mauro
L. Di Venere
P. S. Drell
C. Favuzzi
S. J. Fegan
E. C. Ferrara
W. B. Focke
A. Franckowiak
Y. Fukazawa
S. Funk
P. Fusco
F. Gargano
D. Gasparrini
N. Giglietto
F. Giordano
M. Giroletti
T. Glanzman
G. A. Gomez-Vargas
D. Green
I. A. Grenier
J. E. Grove
L. Guillemot
S. Guiriec
M. Gustafsson
A. K. Harding
E. Hays
J. W. Hewitt
D. Horan
T. Jogler
A. S. Johnson
T. Kamae
D. Kocevski
M. Kuss
G. La Mura
S. Larsson
Deutsche Elektronen-Synchrotron
Clemson University
Los Alamos National Laboratory
Santa Cruz Institute for Particle Physics
Università di Pisa
Institut de Recherche sur les Lois Fondamentales de l'Univers
Istituto Nazionale di Fisica Nucleare, Roma
Università degli Studi di Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Università degli Studi di Padova
Istituto Nazionale Di Fisica Nucleare, Sezione di Pisa
Kavli Institute for Particle Astrophysics and Cosmology
Università degli Studi di Torino
NASA Goddard Space Flight Center
Laboratoire Univers et Particules de Montpellier
Laboratoire Leprince-Ringuet
University of Washington, Seattle
Università degli Studi di Bari
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Agenzia Spaziale Italiana
Università degli Studi di Perugia
George Mason University, Fairfax Campus
Stockholms universitet
Oskar Klein Centre for Cosmoparticle Physics
Rheinisch-Westfälische Technische Hochschule Aachen
Istituto Di Radioastronomia, Bologna
Alma Mater Studiorum Università di Bologna
Università degli Studi di Napoli Federico II
Università degli Studi di Udine
Hiroshima University
Erlangen Centre for Astroparticle Physics
Pontificia Universidad Católica de Chile
University of Maryland
Naval Research Laboratory
Universite d'Orleans
Institut National des Sciences de l'Univers
Universität Göttingen
University of North Florida
Friedrich-Alexander-Universität Erlangen-Nürnberg
University of Tokyo
The Royal Institute of Technology (KTH)
Universitat Autònoma de Barcelona
CNRS Centre National de la Recherche Scientifique
Mahidol University
University of Denver
Keywords: Earth and Planetary Sciences
Issue Date: 1-May-2017
Citation: Astrophysical Journal. Vol.840, No.1 (2017)
Abstract: © 2017. The American Astronomical Society. All rights reserved.. The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what is expected from conventional models of diffuse gamma-ray emission and catalogs of known gamma-ray sources. We study the GeV excess using 6.5 yr of data from the Fermi Large Area Telescope. We characterize the uncertainty of the GC excess spectrum and morphology due to uncertainties in cosmic-ray source distributions and propagation, uncertainties in the distribution of interstellar gas in the Milky Way, and uncertainties due to a potential contribution from the Fermi bubbles. We also evaluate uncertainties in the excess properties due to resolved point sources of gamma rays. The GC is of particular interest, as it would be expected to have the brightest signal from annihilation of weakly interacting massive dark matter (DM) particles. However, control regions along the Galactic plane, where a DM signal is not expected, show excesses of similar amplitude relative to the local background. Based on the magnitude of the systematic uncertainties, we conservatively report upper limits for the annihilation cross-section as a function of particle mass and annihilation channel.
ISSN: 15384357
Appears in Collections:Scopus 2016-2017

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