Search for cosmic-ray induced gamma-ray emission in Galaxy Clusters

M. Ackermann; M. Ajello; A. Albert; A. Allafort; W.B. Atwood; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; E.D. Bloom; E. Bonamente; E. Bottacini; T.J. Brandt; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; S. Buson; G.A. Caliandro; R.A. Cameron; P.A. Caraveo; E. Cavazzuti; R.C.G. Chaves; J. Chiang; G. Chiaro; S. Ciprini; R. Claus; Johann Cohen-Tanugi; J. Conrad; F. d'Ammando; A. de Angelis; F.De Palma; C.D. Dermer; S.W. Digel; P.S. Drell; A. Drlica-Wagner; C. Favuzzi; A. Franckowiak; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; S. Germani; N. Giglietto; F. Giordano; M. Giroletti; G. Godfrey; G.A. Gomez-Vargas; I.A. Grenier; S. Guiriec; M. Gustafsson; D. Hadasch; M. Hayashida; J. Hewitt; R.E. Hughes; T.E. Jeltema; G. Jóhannesson; A.S. Johnson; T. Kamae; J. Kataoka; J. Knödlseder; M. Kuss; J. Lande; S. Larsson; L. Latronico; M.Llena Garde; F. Longo; F. Loparco; M.N. Lovellette; P. Lubrano; M. Mayer; M.N. Mazziotta; J.E. Mcenery; P.F. Michelson; W. Mitthumsiri; T. Mizuno; M.E. Monzani; A. Morselli; I.V. Moskalenko; S. Murgia; R. Nemmen; E. Nuss; T. Ohsugi; M. Orienti; E. Orlando; J.F. Ormes; J.S. Perkins; M. Pesce-Rollins; F. Piron; G. Pivato; S. Rainò; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; J. Ruan; M. Sánchez-Conde; A. Schulz; C. Sgrò; E.J. Siskind; G. Spandre; P. Spinelli; E. Storm; A.W. Strong; D.J. Suson; H. Takahashi; J.G. Thayer; J.B. Thayer; D.J. Thompson; L. Tibaldo; M. Tinivella; D.F. Torres; E. Troja; Y. Uchiyama; T.L. Usher; J. Vandenbroucke; G. Vianello; V. Vitale; B.L. Winer; K.S. Wood; S. Zimmer; A. Pinzke; C. Pfrommer

doi:10.1088/0004-637X/787/1/18

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Search for cosmic-ray induced gamma-ray emission in Galaxy Clusters

Journal article

Open access

Peer reviewed

Search for cosmic-ray induced gamma-ray emission in Galaxy Clusters

M. Ackermann, M. Ajello, A. Albert, A. Allafort, W.B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, …

The Astrophysical Journal, Vol.787

2014

DOI: https://doi.org/10.1088/0004-637X/787/1/18

Abstract

gamma rays: galaxies: clusters

galaxies: clusters: intracluster medium

galaxy: cluster

model: hadronic

cosmic radiation: model

gamma ray: emission

lepton: relativistic

conservation law

efficiency

background

gamma ray: flux

satellite

injection

pressure

thermal

GLAST

radio wave

Current theories predict relativistic hadronic particle populations in clusters of galaxies in addition to the already observed relativistic leptons. In these scenarios hadronic interactions give rise to neutral pions which decay into γ rays that are potentially observable with the Large Area Telescope (LAT) on board the Fermi space telescope. We present a joint likelihood analysis searching for spatially extended γ-ray emission at the locations of 50 galaxy clusters in four years of Fermi-LAT data under the assumption of the universal cosmic-ray (CR) model proposed by Pinzke & Pfrommer. We find an excess at a significance of 2.7σ, which upon closer inspection, however, is correlated to individual excess emission toward three galaxy clusters: A400, A1367, and A3112. We discuss these cases in detail and conservatively attribute the emission to unmodeled background systems (for example, radio galaxies within the clusters).Through the combined analysis of 50 clusters, we exclude hadronic injection efficiencies in simple hadronic models above 21% and establish limits on the CR to thermal pressure ratio within the virial radius, R200, to be below 1.25%-1.4% depending on the morphological classification. In addition, we derive new limits on the γ-ray flux from individual clusters in our sample.

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Title: Search for cosmic-ray induced gamma-ray emission in Galaxy Clusters
Creators - without role: M. Ackermann - Deutsches Elektronen-Synchrotron DESY
M. Ajello - University of California, Berkeley
A. Albert - The Ohio State University
A. Allafort - Kavli Institute for Particle Astrophysics and Cosmology
W.B. Atwood - University of California, Santa Cruz
L. Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Ballet - CEA Paris-Saclay
G. Barbiellini - University of Trieste
D. Bastieri - University of Padua
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E.D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
E. Bonamente - University of Perugia
E. Bottacini - Kavli Institute for Particle Astrophysics and Cosmology
T.J. Brandt - Goddard Space Flight Center
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
P. Bruel - École Polytechnique
R. Buehler - Deutsches Elektronen-Synchrotron DESY
S. Buson - University of Padua
G.A. Caliandro - Institute of Space Sciences
R.A. Cameron - Stanford University
P.A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
E. Cavazzuti - Agenzia Spaziale Italiana
R.C.G. Chaves - Université Paris Cité
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
G. Chiaro - University of Padua
S. Ciprini - Agenzia Spaziale Italiana
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
Johann Cohen-Tanugi - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
J. Conrad - Stockholm University
F. d'Ammando
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F.De Palma
C.D. Dermer - United States Naval Research Laboratory
S.W. Digel - Kavli Institute for Particle Astrophysics and Cosmology
P.S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
A. Drlica-Wagner - Kavli Institute for Particle Astrophysics and Cosmology
C. Favuzzi - Polytechnic University of Bari
A. Franckowiak - Stanford University
S. Funk - Stanford University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - National Institute for Astrophysics
S. Germani - University of Perugia
N. Giglietto - Polytechnic University of Bari
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
G.A. Gomez-Vargas - Universidad Autónoma de Madrid
I.A. Grenier - CEA Paris-Saclay
S. Guiriec - Goddard Space Flight Center
M. Gustafsson - Université Libre de Bruxelles
D. Hadasch - Institute of Space Sciences
M. Hayashida - Stanford University
J. Hewitt - Goddard Space Flight Center
R.E. Hughes - The Ohio State University
T.E. Jeltema - University of California, Santa Cruz
G. Jóhannesson - University of Iceland
A.S. Johnson - Stanford University
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
J. Kataoka - Waseda University
J. Knödlseder - Université Toulouse III - Paul Sabatier
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
S. Larsson - Stockholm University
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
M.Llena Garde - AlbaNova
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Polytechnic University of Bari
M.N. Lovellette - United States Naval Research Laboratory
P. Lubrano - University of Perugia
M. Mayer - Deutsches Elektronen-Synchrotron DESY
M.N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
J.E. Mcenery - University of Maryland, College Park
P.F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Kavli Institute for Particle Astrophysics and Cosmology
T. Mizuno - Hiroshima University
M.E. Monzani - Kavli Institute for Particle Astrophysics and Cosmology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I.V. Moskalenko - Stanford University
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
R. Nemmen - Goddard Space Flight Center
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Ohsugi - Hiroshima University
M. Orienti - Istituto di Radioastronomia di Bologna
E. Orlando - Kavli Institute for Particle Astrophysics and Cosmology
J.F. Ormes - University of Denver
J.S. Perkins - Goddard Space Flight Center
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Pivato - University of Padua
S. Rainò - Polytechnic University of Bari
R. Rando - University of Padua
M. Razzano - University of California, Santa Cruz
S. Razzaque - University of Johannesburg
A. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
O. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
J. Ruan - Washington University in St. Louis
M. Sánchez-Conde - Kavli Institute for Particle Astrophysics and Cosmology
A. Schulz - Deutsches Elektronen-Synchrotron DESY
C. Sgrò - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E.J. Siskind - Real Time Tomography
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
E. Storm - University of California, Santa Cruz
A.W. Strong - Max Planck Institute for Extraterrestrial Physics
D.J. Suson - Purdue University Northwest
H. Takahashi - Hiroshima University
J.G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
J.B. Thayer - Stanford University
D.J. Thompson - Goddard Space Flight Center
L. Tibaldo - Kavli Institute for Particle Astrophysics and Cosmology
M. Tinivella - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D.F. Torres - Institució Catalana de Recerca i Estudis Avançats
E. Troja - Goddard Space Flight Center
Y. Uchiyama
T.L. Usher - Kavli Institute for Particle Astrophysics and Cosmology
J. Vandenbroucke - Kavli Institute for Particle Astrophysics and Cosmology
G. Vianello - Kavli Institute for Particle Astrophysics and Cosmology
V. Vitale - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
B.L. Winer - The Ohio State University
K.S. Wood - United States Naval Research Laboratory
S. Zimmer - AlbaNova
A. Pinzke - University of California, Santa Barbara
C. Pfrommer - Heidelberg Institute for Theoretical Studies
Publication Details: The Astrophysical Journal, Vol.787
Identifiers: 9935243309311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: hal-02017083