Details

Autor(en) / Beteiligte

• ABRAMOWSKI, A
• ACERO, F
• BEHERA, B
• BERNLÖHR, K
• BIRSIN, E
• BITEAU, J
• BOCHOW, A
• BOISSON, C
• BOLMONT, J
• BORDAS, P
• BRUCKER, J
• BRUN, F
• AHARONIAN, F
• BRUN, P
• BULIK, T
• BÜSCHING, I
• CARRIGAN, S
• CASANOVA, S
• CERRUTI, M
• CHADWICK, P. M
• CHARBONNIER, A
• CHAVES, R. C. G
• CHEESEBROUGH, A
• AKHPERJANIAN, A. G
• CLAPSON, A. C
• COIGNET, G
• COLOGNA, G
• CONRAD, J
• DALTON, M
• DANIEL, M. K
• DAVIDS, I. D
• DEGRANGE, B
• DEIL, C
• DICKINSON, H. J
• ANTON, G
• DJANNATI-ATAÏ, A
• DOMAINKO, W
• DRURY, L. O'C
• DUBUS, G
• DUTSON, K
• DYKS, J
• DYRDA, M
• EGBERTS, K
• EGER, P
• ESPIGAT, P
• BALZER, A
• FALLON, L
• FARNIER, C
• FEGAN, S
• FEINSTEIN, F
• FERNANDES, M. V
• FIASSON, A
• FONTAINE, G
• FÖRSTER, A
• FÜSSLING, M
• GALLANT, Y. A
• BARNACKA, A
• DE ALMEIDA, U. Barres
• BECHERINI, Y
• BECKER, J

Titel

SEARCH FOR DARK MATTER ANNIHILATION SIGNALS FROM THE FORNAX GALAXY CLUSTER WITH H.E.S.S

Ist Teil von

• The Astrophysical journal, 2012-05, Vol.750 (2), p.1-11

Ort / Verlag

Bristol: IOP

Erscheinungsjahr

2012

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The Fornax galaxy cluster was observed with the Fligh Energy Stereoscopic System for a total live time of 14.5 hr, searching for very high energy (VEIE; E > 100GeV) gamma -rays from dark matter (DM) annihilation. No significant signal was found in searches for point-like and extended emissions. Using several models of the DM density distribution, upper limits on the DM velocity-weighted annihilation cross-section [left angle bracket][sigma][upsilon][right angle bracket] as a function of the DM particle mass are derived. Constraints are derived for different DM particle models, such as those arising from Kaluza-Klein and supersymmetric models. Various annihilation final states are considered. Possible enhancements of the DM annihilation gamma -ray flux, due to DM substructures of the DM host halo, or from the Sommerfeld effect, are studied. Additional gamma -ray contributions from internal bremsstrahlung and inverse Compton radiation are also discussed. For a DM particle mass of 1 TeV, the exclusion limits at 95% of confidence level reach values of [left angle bracket][sigma][upsilon][right angle bracket] super(95%C.L.) ~ 10 super(-23) cm super(3) s super(-1), depending on the DM particle model and halo properties. Additional contribution from DM substructures can improve the upper limits on [left angle bracket][sigma][upsilon][right angle bracket] by more than two orders of magnitude. At masses around 4.5 TeV, the enhancement by substructures and the Sommerfeld resonance effect results in a velocity-weighted annihilation cross-section upper limit at the level of [left angle bracket][sigma][upsilon][right angle bracket] super(95%CL) ~ 10 super(-26) cm super(3) s super(-1).