Constraints on the gamma-ray emission from the cluster-scale AGN outburst in the Hydra A galaxy cluster

被引：2

作者：

Abramowski, A. ^{[1
]}

Acero, F. ^{[2
]}

Aharonian, F. ^{[3
,4
,5
]}

Akhperjanian, A. G. ^{[5
,6
]}

Anton, G. ^{[7
]}

Balenderan, S. ^{[8
]}

Balzer, A. ^{[7
]}

Barnacka, A. ^{[9
,10
]}

Becherini, Y. ^{[11
,12
]}

Becker, J. ^{[13
]}

Bernloehr, K. ^{[3
,14
]}

Birsin, E. ^{[14
]}

Biteau, J. ^{[12
]}

Bochow, A. ^{[3
]}

Boisson, C. ^{[15
]}

Bolmont, J. ^{[16
]}

Bordas, P. ^{[17
]}

Brucker, J. ^{[7
]}

Brun, F. ^{[12
]}

Brun, P. ^{[10
]}

Bulik, T. ^{[18
]}

Buesching, I. ^{[13
,19
]}

Carrigan, S. ^{[3
]}

Casanova, S. ^{[3
,19
]}

Cerruti, M. ^{[15
]}

Chadwick, P. M. ^{[8
]}

Charbonnier, A. ^{[16
]}

Chaves, R. C. G. ^{[3
,10
]}

Cheesebrough, A. ^{[8
]}

Cologna, G. ^{[20
]}

Conrad, J. ^{[21
]}

Couturier, C. ^{[16
]}

Daniel, M. K. ^{[8
]}

Davids, I. D. ^{[22
]}

Degrange, B. ^{[12
]}

Deil, C. ^{[3
]}

Dickinson, H. J. ^{[21
]}

Djannati-Atai, A. ^{[11
]}

Domainko, W. ^{[3
]}

Drury, L. O'C. ^{[4
]}

Dubus, G. ^{[23
]}

Dutson, K. ^{[24
]}

Dyks, J. ^{[9
]}

Dyrda, M. ^{[25
]}

Egberts, K. ^{[26
]}

Eger, P. ^{[7
]}

Espigat, P. ^{[11
]}

Fallon, L. ^{[4
]}

Fegan, S. ^{[12
]}

Feinstein, F. ^{[2
]}

机构：

[1] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany

[2] Univ Montpellier 2, CNRS IN2P3, Lab Univers & Particules Montpellier, F-34095 Montpellier 5, France

[3] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

[4] Dublin Inst Adv Studies, Dublin 2, Ireland

[5] Natl Acad Sci Republ Armenia, Yerevan, Armenia

[6] Yerevan Phys Inst, Yerevan 375036, Armenia

[7] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany

[8] Univ Durham, Dept Phys, Durham DH1 3LE, England

[9] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland

[10] CEA Saclay, DSM IRFU, F-91191 Gif Sur Yvette, France

[11] Univ Paris Diderot, CNRS IN2P3, CEA Irfu, Observ Paris,APC, F-75205 Paris 13, France

[12] Ecole Polytech, CNRS IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[13] Ruhr Univ Bochum, Lehrstuhl Weltraum & Astrophys 4, Inst Theoret Phys, D-44780 Bochum, Germany

[14] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[15] Univ Paris Diderot, CNRS, Observ Paris, LUTH, F-92190 Meudon, France

[16] Univ Paris 06, Univ Denis Diderot Paris 7, CNRS IN2P3, LPNHE, F-75252 Paris 05, France

[17] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany

[18] Univ Warsaw, Astron Observ, PL-00478 Warsaw, Poland

[19] North West Univ, Unit Space Phys, ZA-2520 Potchefstroom, South Africa

[20] Heidelberg Univ, Landessternwarte, D-69117 Heidelberg, Germany

[21] Stockholm Univ, Albanova Univ Ctr, Dept Phys, Oskar Klein Ctr, S-10691 Stockholm, Sweden

[22] Univ Namibia, Dept Phys, Windhoek, Namibia

[23] UJF Grenoble 1 CNRS INSU, Inst Planetol & Astrophys Grenoble IPAG UMR 5274, F-38041 Grenoble, France

[24] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[25] Inst Fiz Jadrowej PAN, PL-31342 Krakow, Poland

[26] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria

[27] Univ Savoie, Lab Annecy Le Vieux Phys Particules, CNRS IN2P3, F-74941 Annecy Le Vieux, France

[28] Uniwersytet Jagiellonski, Obserwatorium Astron, PL-30244 Krakow, Poland

[29] Nicolaus Copernicus Univ, Torun Ctr Astron, PL-87100 Torun, Poland

[30] Univ Adelaide, Sch Chem & Phys, Adelaide, SA 5005, Australia

[31] Charles Univ Prague, Fac Math & Phys, Inst Particle & Nucl Phys, CR-18000 Prague 8, Czech Republic

[32] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 545卷

关键词：

gamma rays: galaxies: clusters; galaxies: clusters: individual: Hydra A; galaxies: active; LARGE-AREA TELESCOPE; MAGNETIC-FIELDS; COSMIC-RAYS; A CLUSTER; PERSEUS; CORE; CAVITIES; BUBBLES; CHANDRA; LIMITS;

D O I：

10.1051/0004-6361/201219655

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. In some galaxy clusters, powerful active galactic nuclei (AGN) have blown bubbles with cluster scale extent into the ambient medium. The main pressure support of these bubbles is not known to date, but cosmic rays are a viable possibility. For such a scenario copious gamma-ray emission is expected as a tracer of cosmic rays from these systems. Aims. Hydra A, the closest galaxy cluster hosting a cluster scale AGN outburst, located at a redshift of 0.0538, is investigated for being a gamma-ray emitter with the High Energy Stereoscopic System (H.E.S.S.) array and the Fermi Large Area Telescope (Fermi-LAT). Methods. Data obtained in 20.2 h of dedicated H. E. S. S. observations and 38 months of Fermi-LAT data, gathered by its usual all-sky scanning mode, have been analyzed to search for a gamma-ray signal. Results. No signal has been found in either data set. Upper limits on the gamma-ray flux are derived and are compared to models. These are the first limits on gamma-ray emission ever presented for galaxy clusters hosting cluster scale AGN outbursts. Conclusions. The non-detection of Hydra A in gamma-rays has important implications on the particle populations and physical conditions inside the bubbles in this system. For the case of bubbles mainly supported by hadronic cosmic rays, the most favorable scenario, which involves full mixing between cosmic rays and embedding medium, can be excluded. However, hadronic cosmic rays still remain a viable pressure support agent to sustain the bubbles against the thermal pressure of the ambient medium. The largest population of highly-energetic electrons, which are relevant for inverse-Compton gamma-ray production is found in the youngest inner lobes of Hydra A. The limit on the inverse-Compton gamma-ray flux excludes a magnetic field below half of the equipartition value of 16 mu G in the inner lobes.

引用

页数：8

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