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Authors: M. Ackermann
M. Ajello
A. Albert
W. B. Atwood
L. Baldini
J. Ballet
G. Barbiellini
D. Bastieri
K. Bechtol
R. Bellazzini
E. Bissaldi
R. D. Blandford
E. D. Bloom
R. Bonino
E. Bottacini
J. Bregeon
P. Bruel
R. Buehler
G. A. Caliandro
R. A. Cameron
M. Caragiulo
P. A. Caraveo
J. M. Casandjian
E. Cavazzuti
C. Cecchi
E. Charles
A. Chekhtman
G. Chiaro
S. Ciprini
J. Cohen-Tanugi
J. Conrad
S. Cutini
F. D'Ammando
A. De Angelis
F. De Palma
R. Desiante
S. W. Digel
L. Di Venere
P. S. Drell
C. Favuzzi
S. J. Fegan
Y. Fukazawa
S. Funk
P. Fusco
F. Gargano
D. Gasparrini
N. Giglietto
F. Giordano
M. Giroletti
G. Godfrey
D. Green
I. A. Grenier
S. Guiriec
E. Hays
J. W. Hewitt
D. Horan
G. Jóhannesson
M. Kuss
S. Larsson
L. Latronico
J. Li
L. Li
F. Longo
F. Loparco
M. N. Lovellette
P. Lubrano
G. M. Madejski
S. Maldera
A. Manfreda
M. Mayer
M. N. Mazziotta
P. F. Michelson
W. Mitthumsiri
T. Mizuno
Deutsche Elektronen-Synchrotron
Clemson University
Kavli Institute for Particle Astrophysics and Cosmology
Santa Cruz Institute for Particle Physics
Università di Pisa
Universite Paris 7- Denis Diderot
Istituto Nazionale di Fisica Nucleare, Roma
Universita degli Studi di Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Università degli Studi di Padova
University of Wisconsin Madison
Istituto Nazionale Di Fisica Nucleare, Sezione di Pisa
Università degli Studi di Torino
Laboratoire Univers et Particules de Montpellier
Laboratoire Leprince-Ringuet
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
Università degli Studi di Bari
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Agenzia Spaziale Italiana
Universita degli Studi di Perugia
George Mason University, Fairfax Campus
Stockholms universitet
Oskar Klein Centre for Cosmoparticle Physics
Osservatorio Astronomico di Roma
Istituto Di Radioastronomia, Bologna
Alma Mater Studiorum Università di Bologna
Universita degli Studi di Udine
Università degli Studi di Napoli Federico II
Hiroshima University
Erlangen Centre for Astroparticle Physics
University of Maryland
NASA Goddard Space Flight Center
University of North Florida
University Science Institute Reykjavik
The Royal Institute of Technology (KTH)
Universitat Autònoma de Barcelona
Naval Research Laboratory
Mahidol University
University of California, Irvine
University of Denver
Max Planck Institut fur Physik (Werner-Heisenberg-Institut)
Medizinische Universitat Innsbruck
NYCB Realtime Computing Inc.
Keywords: Earth and Planetary Sciences
Issue Date: 10-Mar-2016
Citation: Astrophysical Journal. Vol.819, No.2 (2016)
Abstract: © 2016. The American Astronomical Society. All rights reserved.. We present results from γ-ray observations of the Coma cluster incorporating six years of Fermi-LAT data and the newly released "Pass 8" event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the γ-ray flux that is expected from energetic particle interactions in the cluster. We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons. In this case, the median expected and observed upper limits for the flux above 100 are 1.7 times;10-9 ph cm-2 s-1 and 5.2 times;10-9 ph cm-2 s-1 respectively (the latter corresponds to residual emission at the level of 1.8σ). These bounds are comparable to or higher than predicted levels of hadronic gamma-ray emission in cosmic-ray (CR) models with or without reacceleration of secondary electrons, although direct comparisons are sensitive to assumptions regarding the origin and propagation mode of CRs and magnetic field properties. The minimal expected γ-ray flux from radio and star-forming galaxies within the Coma cluster is roughly an order of magnitude below the median sensitivity of our analysis.
ISSN: 15384357
Appears in Collections:Scopus 2016-2017

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