Very high energy gamma-ray observations of the galaxy clusters Abell 496 and Abell 85 with H.E.S.S

F. Aharonian; A.G. Akhperjanian; G. Anton; U. Barres de Almeida; A.R. Bazer-Bachi; Y. Becherini; B. Behera; K. Bernlöhr; C. Boisson; A. Bochow; V. Borrel; I. Braun; E. Brion; J. Brucker; P. Brun; R. Bühler; T. Bulik; I. Süching; T. Boutelier; P.M. Chadwick; A. Charbonnier; R.C.G. Chaves; A. Cheesebrough; L.-M. Chounet; A.C. Clapson; G. Coignet; M.K. Daniel; B. Degrange; C. Deil; H.J. Dickinson; A. Djannati-Ataï; W. Domainko; L.O'C. Drury; F. Dubois; G. Dubus; J. Dyks; M. Dyrda; K. Egberts; D. Emmanoulopoulos; P. Espigat; C. Farnier; F. Feinstein; A. Fiasson; A. Förster; G. Fontaine; M. Füsling; S. Gabici; Y.A. Gallant; L. Gérard; B. Giebels; J.F. Glicenstein; B. Glück; P. Goret; D. Hauser; M. Hauser; S. Heinz; G. Heinzelmann; G. Henri; G. Hermann; J.A. Hinton; A. Hoffmann; W. Hofmann; M. Holleran; S. Hoppe; D. Horns; A. Jacholkowska; O.C. de Jager; I. Jung; K. Katarzy'Nski; U. Katz; S. Kaufmann; E. Kendziorra; M. Kerschhaggl; D. Khangulyan; B. Khélifi; D. Keogh; Nu. Komin; K. Kosack; G. Lamanna; J.-P. Lenain; T. Lohse; V. Marandon; J.M. Martin; O. Martineau-Huynh; A. Marcowith; D. Maurin; T.J.L. Mccomb; M.C. Medina; R. Moderski; Emmanuel Moulin; M. Naumann-Godo; M. de Naurois; D. Nedbal; D. Nekrassov; J. Niemiec; S.J. Nolan; S. Ohm; J.-F. Olive; E. de Oña Wilhelmi; K.J. Orford; M. Ostrowski; M. Panter; M. Paz Arribas; G. Pedaletti; G. Pelletier; P.-O. Petrucci; S. Pita; G. P¨uhlhofer; M. Punch; A. Quirrenbach; B.C. Raubenheimer; M. Raue; S.M. Rayner; M. Renaud; F. Rieger; J. Ripken; L. Rob; S. Rosier-Lees; G. Rowell; B. Rudak; C.B. Rulten; J. Ruppel; V. Sahakian; A. Santangelo; R. Schlickeiser; F.M. Schöck; R. Schröder; U. Schwanke; S. Schwarzburg; S. Schwemmer; A. Shalchi; J.L. Skilton; H. Sol; D. Spangler; L. Stawarz; R. Steenkamp; C. Stegmann; G. Superina; A. Szostek; P.H. Tam; J.-P. Tavernet; R. Terrier; O. Tibolla; C. van Eldik; G. Vasileiadis; C. Venter; L. Venter; J.P. Vialle; P. Vincent; M. Vivier; H.J. Völk; F. Volpe; S.J. Wagner; M. Ward; A.A. Zdziarski; A. Zech

doi:10.1051/0004-6361:200811372

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Very high energy gamma-ray observations of the galaxy clusters Abell 496 and Abell 85 with H.E.S.S

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Very high energy gamma-ray observations of the galaxy clusters Abell 496 and Abell 85 with H.E.S.S

F. Aharonian, A.G. Akhperjanian, G. Anton, U. Barres de Almeida, A.R. Bazer-Bachi, Y. Becherini, B. Behera, K. Bernlöhr, C. Boisson, A. Bochow, …

Astronomy & Astrophysics - A&A, Vol.495, pp.27-35

2009

DOI: https://doi.org/10.1051/0004-6361:200811372

Abstract

Galaxies: clusters: individual: Abell 496

Abell 85

Gamma rays: observations

Aims: The nearby galaxy clusters Abell 496 and Abell 85 are studied in the very high energy (VHE, E > 100 GeV) band to investigate VHE cosmic rays (CRs) in this class of objects which are the largest gravitationally bound systems in the Universe. Methods: H.E.S.S., an array of four Imaging Atmospheric Cherenkov Telescopes (IACT), is used to observe the targets in the range of VHE gamma rays. Results: No significant gamma-ray signal is found at the respective position of the two clusters with several different source size assumptions for each target. In particular, emission regions corresponding to the high density core, to the extension of the entire X-ray emission in these clusters, and to the very extended region where the accretion shock is expected, are investigated. Upper limits are derived for the gamma-ray flux at energies E>570 GeV for Abell 496 and E>460 GeV for Abell 85. Conclusions: From the non-detection in VHE gamma rays, upper limits on the total energy of hadronic CRs in the clusters are calculated. If the cosmic-ray energy density follows the large scale gas density profile, the limit on the fraction of energy in these non-thermal particles with respect to the total thermal energy of the intra-cluster medium (ICM) is 51% for Abell 496 and only 8% for Abell 85 due to its larger mass and higher gas density. These upper limits are compared with theoretical estimates. They predict about ~10% of the thermal energy of the ICM in non-thermal particles. The observations presented here can constrain these predictions especially for the case of the Abell 85 cluster.

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Title: Very high energy gamma-ray observations of the galaxy clusters Abell 496 and Abell 85 with H.E.S.S
Creators - without role: F. Aharonian - Max Planck Innovation
A.G. Akhperjanian - A. Alikhanyan National Laboratory
G. Anton - Friedrich-Alexander-Universität Erlangen-Nürnberg
U. Barres de Almeida
A.R. Bazer-Bachi - Roche
Y. Becherini - Université Paris Cité
B. Behera - Heidelberg University
K. Bernlöhr - Humboldt-Universität zu Berlin
C. Boisson - Université Paris Cité
A. Bochow - Max Planck Innovation
V. Borrel - Roche
I. Braun - Max Planck Innovation
E. Brion - DSM (Netherlands)
J. Brucker - Friedrich-Alexander-Universität Erlangen-Nürnberg
P. Brun - DSM (Netherlands)
R. Bühler - Max Planck Innovation
T. Bulik - Nicolaus Copernicus Astronomical Center
I. Süching
T. Boutelier - Université Joseph Fourier
P.M. Chadwick - Durham University
A. Charbonnier - Sorbonne Université
R.C.G. Chaves - Max Planck Innovation
A. Cheesebrough - Durham University
L.-M. Chounet - Laboratoire Leprince-Ringuet
A.C. Clapson - Max Planck Innovation
G. Coignet - Laboratoire d’Annecy de Physique des Particules
M.K. Daniel - Durham University
B. Degrange - Laboratoire d'Informatique de l'École Polytechnique
C. Deil - Max Planck Innovation
H.J. Dickinson - Durham University
A. Djannati-Ataï - APC - Astrophysique des Hautes Energies
W. Domainko - Max Planck Innovation
L.O'C. Drury - Centre d'étude spatiale des rayonnements
F. Dubois - Laboratoire d’Annecy de Physique des Particules
G. Dubus - Université Joseph Fourier
J. Dyks - Nicolaus Copernicus Astronomical Center
M. Dyrda - Institute of Nuclear Physics, Polish Academy of Sciences
K. Egberts - Max Planck Innovation
D. Emmanoulopoulos - Heidelberg University
P. Espigat - Université Paris Cité
C. Farnier - Université de Montpellier
F. Feinstein - Université de Montpellier
A. Fiasson - Laboratoire de Physique Théorique
A. Förster - Max Planck Innovation
G. Fontaine - Laboratoire d'Informatique de l'École Polytechnique
M. Füsling
S. Gabici - Dublin Institute For Advanced Studies
Y.A. Gallant - Université de Montpellier
L. Gérard - Université Paris Cité
B. Giebels - Laboratoire d'Informatique de l'École Polytechnique
J.F. Glicenstein - DSM (Netherlands)
B. Glück - Friedrich-Alexander-Universität Erlangen-Nürnberg
P. Goret - DSM (Netherlands)
D. Hauser - Heidelberg University
M. Hauser - Heidelberg University
S. Heinz - Friedrich-Alexander-Universität Erlangen-Nürnberg
G. Heinzelmann - Universität Hamburg
G. Henri - Université Joseph Fourier
G. Hermann - Max Planck Society
J.A. Hinton - University of Leeds
A. Hoffmann - University of Tübingen
W. Hofmann - Max Planck Society
M. Holleran - North-West University
S. Hoppe - Max Planck Innovation
D. Horns - Universität Hamburg
A. Jacholkowska - Laboratoire de Physique Nucléaire et de Hautes Énergies
O.C. de Jager - North-West University
I. Jung - Friedrich-Alexander-Universität Erlangen-Nürnberg
K. Katarzy'Nski
U. Katz - Friedrich-Alexander-Universität Erlangen-Nürnberg
S. Kaufmann - Heidelberg University
E. Kendziorra - University of Tübingen
M. Kerschhaggl - Humboldt-Universität zu Berlin
D. Khangulyan - Max Planck Society
B. Khélifi - Laboratoire d'Informatique de l'École Polytechnique
D. Keogh - Durham University
Nu. Komin - DSM (Netherlands)
K. Kosack - Max Planck Society
G. Lamanna - Institut National de Physique Nucléaire et de Physique des Particules
J.-P. Lenain - Université Paris Cité
T. Lohse - Humboldt-Universität zu Berlin
V. Marandon - Université Paris Cité
J.M. Martin - Université Paris Cité
O. Martineau-Huynh - Sorbonne Université
A. Marcowith - Université de Montpellier
D. Maurin - Sorbonne Université
T.J.L. Mccomb - Durham University
M.C. Medina - Délégation Paris 7
R. Moderski - Nicolaus Copernicus Astronomical Center
Emmanuel Moulin - DSM (Netherlands)
M. Naumann-Godo - Laboratoire d'Informatique de l'École Polytechnique
M. de Naurois - Sorbonne Université
D. Nedbal - Charles University
D. Nekrassov - Max Planck Innovation
J. Niemiec - Institute of Nuclear Physics, Polish Academy of Sciences
S.J. Nolan - Durham University
S. Ohm - Max Planck Innovation
J.-F. Olive - Roche
E. de Oña Wilhelmi - Centre de Gestion Scientifique
K.J. Orford - Durham University
M. Ostrowski - Jagiellonian University
M. Panter - Max Planck Innovation
M. Paz Arribas
G. Pedaletti - Heidelberg University
G. Pelletier - Université Joseph Fourier
P.-O. Petrucci - Université Joseph Fourier
S. Pita - Université Paris Cité
G. P¨uhlhofer
M. Punch - Université Paris Cité
A. Quirrenbach - Heidelberg University
B.C. Raubenheimer - North-West University
M. Raue - Max Planck Innovation
S.M. Rayner - Durham University
M. Renaud - Max Planck Innovation
F. Rieger - Max Planck Innovation
J. Ripken - Universität Hamburg
L. Rob - Charles University
S. Rosier-Lees - Laboratoire d’Annecy de Physique des Particules
G. Rowell - University of Adelaide
B. Rudak - Nicolaus Copernicus Astronomical Center
C.B. Rulten - Durham University
J. Ruppel - Ruhr University Bochum
V. Sahakian - A. Alikhanyan National Laboratory
A. Santangelo - University of Tübingen
R. Schlickeiser - Ruhr University Bochum
F.M. Schöck - Friedrich-Alexander-Universität Erlangen-Nürnberg
R. Schröder - Ruhr University Bochum
U. Schwanke - Humboldt-Universität zu Berlin
S. Schwarzburg - University of Tübingen
S. Schwemmer - Heidelberg University
A. Shalchi - Ruhr University Bochum
J.L. Skilton - University of Leeds
H. Sol - Université Paris Cité
D. Spangler - Durham University
L. Stawarz
R. Steenkamp - University of Namibia
C. Stegmann - Friedrich-Alexander-Universität Erlangen-Nürnberg
G. Superina - Laboratoire d'Informatique de l'École Polytechnique
A. Szostek - Max Planck Innovation
P.H. Tam - Heidelberg University
J.-P. Tavernet - Laboratoire de Physique Nucléaire et de Hautes Énergies
R. Terrier - Université Paris Cité
O. Tibolla - Max Planck Innovation
C. van Eldik - Max Planck Innovation
G. Vasileiadis - Université de Montpellier
C. Venter - North-West University
L. Venter - Université Paris Cité
J.P. Vialle - Institut National de Physique Nucléaire et de Physique des Particules
P. Vincent - Sorbonne Université
M. Vivier - DSM (Netherlands)
H.J. Völk - Max Planck Society
F. Volpe - Laboratoire d'Informatique de l'École Polytechnique
S.J. Wagner - Heidelberg University
M. Ward - Durham University
A.A. Zdziarski - Nicolaus Copernicus Astronomical Center
A. Zech - Université Paris Cité
Publication Details: Astronomy & Astrophysics - A&A, Vol.495, pp.27-35
Identifiers: 9937607509311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00345966