HESS constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies

被引:69
作者
Abramowski, A. [2 ]
Acero, F. [3 ]
Aharonian, F. [4 ,5 ,6 ]
Akhperjanian, A. G. [6 ,7 ]
Anton, G. [8 ]
Barnacka, A. [9 ,10 ]
de Almeida, U. Barres [11 ]
Bazer-Bachi, A. R. [12 ]
Becherini, Y. [13 ,14 ]
Becker, J. [15 ]
Behera, B. [16 ]
Bernloehr, K. [4 ,17 ]
Bochow, A. [4 ]
Boisson, C. [18 ]
Bolmontr, J. [1 ]
Bordas, P. [19 ]
Borrel, V. [12 ]
Brucker, J. [8 ]
Brun, F. [14 ]
Brun, P. [10 ]
Bulik, T. [20 ]
Buesching, I. [21 ]
Carrigan, S. [4 ]
Casanova, S. [4 ,15 ]
Cerruti, M. [18 ]
Chadwick, P. M. [11 ]
Charbonnier, A. [1 ]
Chaves, R. C. G. [4 ]
Cheesebrough, A. [11 ]
Chounet, L. -M. [14 ]
Clapson, A. C. [4 ]
Coignet, G. [22 ]
Conrad, J. [23 ]
Dalton, M. [17 ]
Daniel, M. K. [11 ]
Davids, I. D. [24 ]
Degrange, B. [14 ]
Deil, C. [4 ]
Dickinson, H. J. [11 ,23 ]
Djannati-Atai, A. [13 ]
Domainko, W. [4 ]
Drury, L. O. C. [5 ]
Dubois, F. [22 ]
Dubus, G. [25 ]
Dyks, J. [9 ]
Dyrda, M. [26 ]
Egberts, K. [27 ]
Eger, P. [8 ]
Espigat, P. [13 ]
Fallon, L. [5 ]
机构
[1] Univ Paris 07, Univ Paris 06, LPNHE, CNRS,IN2P3, F-75252 Paris 5, France
[2] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany
[3] Univ Montpellier 2, Lab Phys Theor & Astroparticules, CNRS, IN2P3, F-34095 Montpellier 5, France
[4] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
[5] Dublin Inst Adv Studies, Dublin 2, Ireland
[6] Natl Acad Sci Republ Armenia, Yerevan, Armenia
[7] Yerevan Phys Inst, Yerevan 375036, Armenia
[8] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany
[9] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland
[10] CEA Saclay, DSM, IRFU, F-91191 Gif Sur Yvette, France
[11] Univ Durham, Dept Phys, Durham DH1 3LE, England
[12] UPS, CNRS, Ctr Etud Spatiale Rayonnements, F-31029 Toulouse 4, France
[13] Univ Paris 07, CNRS, F-75205 Paris 13, France
[14] Ecole Polytech, CNRS, Lab Leprince Ringuet, IN2P3, F-91128 Palaiseau, France
[15] Ruhr Univ Bochum, Inst Theoret Phys, Lehrstuhl Weltraum & Astrophys 4, D-44780 Bochum, Germany
[16] Univ Heidelberg, D-69117 Heidelberg, Germany
[17] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[18] Univ Paris Diderot, CNRS, LUTH, Observ Paris, F-92190 Meudon, France
[19] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany
[20] Univ Warsaw, Astron Observ, PL-00478 Warsaw, Poland
[21] North West Univ, Unit Space Phys, ZA-2520 Potchefstroom, South Africa
[22] Univ Savoie, Lab Annecy Le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France
[23] Stockholm Univ, Albanova Univ Ctr, Oskar Klein Ctr, Dept Phys, SE-10691 Stockholm, Sweden
[24] Univ Namibia, Dept Phys, Windhoek, Namibia
[25] Univ Grenoble 1, CNRS, Lab Astrophys Grenoble, INSU, F-38041 Grenoble 9, France
[26] Drowej PAN, Inst Fiz Ja, PL-31342 Krakow, Poland
[27] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria
[28] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[29] Uniwersytet Jagiellonski, Obserwatorium Astron, PL-30244 Krakow, Poland
[30] Nicholas Copernicus Univ, Torun Ctr Astron, PL-87100 Torun, Poland
[31] Univ Adelaide, Sch Chem & Phys, Adelaide, SA 5005, Australia
[32] Charles Univ Prague, Fac Math & Phys, Inst Particle & Nucl Phys, CR-18000 Prague 8, Czech Republic
[33] CNRS & MPG, European Associated Lab Gamma Ray Astron, Paris, France
[34] Royal Inst Technol KTH, Oskar Klein Ctr, Dept Phys, SE-10691 Stockholm, Sweden
[35] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England
关键词
Gamma-rays: observations - Dwarf spheroidal galaxy; Dark matter; Sculptor; Carina; Sommerfeld enhancement; Internal Bremsstrahlung; EXPLORING HALO SUBSTRUCTURE; LARGE-AREA TELESCOPE; GAMMA-RAY EMISSION; SPHEROIDAL GALAXIES; CHERENKOV TELESCOPES; PROPER MOTIONS; GIANT STARS; SEARCH; SYSTEM; DISTRIBUTIONS;
D O I
10.1016/j.astropartphys.2010.12.006
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Sculptor and Carina dwarf spheroidal galaxies were observed with the H.E.S.S. Cherenkov telescope array between January 2008 and December 2009. The data sets consist of a total of 11.8 h and 14.811 of high quality data, respectively. No gamma-ray signal was detected at the nominal positions of these galaxies above 220 GeV and 320 GeV, respectively. Upper limits on the gamma-ray fluxes at 95% CL assuming two forms for the spectral energy distribution (a power law shape and one derived from dark matter annihilation) are obtained at the level of 10(-13)-10(-12) cm(-2) s(-1) in the TeV range. Constraints on the velocity weighted dark matter particle annihilation cross section for both Sculptor and Carina dwarf galaxies range from <sigma v > 10(-21) cm(3) s(-1) down to <sigma v > similar to 10(-2)2 cm(3) s(-1) on the dark matter halo model used. Possible enhancements of the gamma-ray flux are studied: the Sommerfeld effect, which is found to exclude some dark matter particle masses, the internal Bremsstrahlung and clumps in the dark-matter halo distributions. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:608 / 616
页数:9
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