UPPER LIMITS ON THE VHE GAMMA-RAY EMISSION FROM THE WILLMAN 1 SATELLITE GALAXY WITH THE MAGIC TELESCOPE

被引：48

作者：

Aliu, E. ^{[1
]}

Anderhub, H. ^{[2
]}

Antonelli, L. A. ^{[3
]}

Antoranz, P. ^{[4
]}

Backes, M. ^{[5
]}

Baixeras, C. ^{[6
]}

Balestra, S. ^{[4
]}

Barrio, J. A. ^{[4
]}

Bartko, H. ^{[7
]}

Bastieri, D. ^{[8
,9
]}

Becerra Gonzalez, J. ^{[10
]}

Becker, J. K. ^{[5
]}

Bednarek, W. ^{[11
]}

Berger, K. ^{[11
]}

Bernardini, E. ^{[12
]}

Biland, A. ^{[2
]}

Bock, R. K. ^{[7
,8
,9
]}

Bonnoli, G. ^{[13
,14
]}

Bordas, P. ^{[15
]}

Tridon, D. Borla ^{[7
]}

Bosch-Ramon, V. ^{[15
]}

Bose, D. ^{[4
]}

Bretz, T. ^{[16
]}

Britvitch, I. ^{[2
]}

Camara, M. ^{[4
]}

Carmona, E. ^{[7
]}

Commichau, S. ^{[2
]}

Contreras, J. L. ^{[4
]}

Cortina, J. ^{[1
]}

Costado, M. T. ^{[10
,17
]}

Covino, S. ^{[3
]}

Curtef, V. ^{[5
]}

Dazzi, F. ^{[8
,9
,18
,19
]}

De Angelis, A. ^{[18
,19
]}

De Cea del Pozo, E. ^{[20
]}

de los Reyes, R. ^{[4
]}

De Lotto, B. ^{[18
,19
]}

De Maria, M. ^{[18
,19
]}

De Sabata, F. ^{[18
,19
]}

Delgado Mendez, C. ^{[10
]}

Dominguez, A. ^{[2
,21
]}

Dorner, D.

Doro, M. ^{[8
,9
]}

Elsaesser, D. ^{[16
]}

Errando, M. ^{[1
]}

Ferenc, D. ^{[22
]}

Fernandez, E. ^{[1
]}

Firpo, R. ^{[1
]}

Fonseca, M. V. ^{[4
]}

Font, L. ^{[6
]}

机构：

[1] IFAE, E-08193 Barcelona, Spain

[2] ETH, CH-8093 Zurich, Switzerland

[3] Natl Inst Astrophys, INAF, I-00136 Rome, Italy

[4] Univ Complutense, E-28040 Madrid, Spain

[5] Tech Univ Dortmund, D-44221 Dortmund, Germany

[6] Univ Autonoma Barcelona, E-08193 Bellaterra, Spain

[7] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[8] Univ Padua, I-35131 Padua, Italy

[9] Ist Nazl Fis Nucl, I-35131 Padua, Italy

[10] Inst Astrofis Canarias, E-38200 Tenerife, Spain

[11] Univ Lodz, PL-90236 Lodz, Poland

[12] DESY, D-15738 Zeuthen, Germany

[13] Univ Siena, I-53100 Siena, Italy

[14] INFN Pisa, I-53100 Siena, Italy

[15] Univ Barcelona, ICC IEEC, E-08028 Barcelona, Spain

[16] Univ Wurzburg, D-97074 Wurzburg, Germany

[17] Univ Tenerife, Depto Astrofis, E-38206 Tenerife, Spain

[18] Univ Udine, I-33100 Udine, Italy

[19] INFN Trieste, I-33100 Udine, Italy

[20] IEEC CSIC, Inst Ciencies Espai, E-08193 Barcelona, Spain

[21] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain

[22] Univ Calif Davis, Davis, CA 95616 USA

[23] Turku Univ, Tuorla Observ, FI-21500 Piikkio, Finland

[24] Inst Nucl Energy Res, BG-1784 Sofia, Bulgaria

[25] Osserv Astron Trieste, INAF, I-34143 Trieste, Italy

[26] Ist Nazl Fis Nucl, I-34143 Trieste, Italy

[27] ICREA, E-08010 Barcelona, Spain

[28] Univ Pisa, I-56126 Pisa, Italy

[29] INFN Pisa, I-56126 Pisa, Italy

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 697卷 / 02期

关键词：

dark matter; galaxies: dwarf; gamma rays: observations; DARK-MATTER ANNIHILATION; DWARF GALAXY; HALOS; SUBSTRUCTURE; SEARCH; SIGNAL;

D O I：

10.1088/0004-637X/697/2/1299

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the result of the observation of the ultrafaint dwarf galaxy Willman 1 performed with the 17 m MAGIC telescope during 15.5 hr between March and May 2008. No significant gamma-ray emission was found. We derived upper limits of the order of 10(-12) ph cm(-2) s(-1) on the integral flux above 100 GeV, which we compare with predictions from several of the established neutralino benchmark models in the mSUGRA parameter space. The neutralino annihilation spectra are defined after including the recently quantified contribution of internal bremsstrahlung from the virtual sparticles that mediate the annihilation. Flux boost factors of three orders of magnitude are required even in the most optimistic scenario to match our upper limits. However, uncertainties in the dark matter intrinsic and extrinsic properties (e.g., presence of substructures, Sommerfeld effect) may significantly reduce this gap.

引用

页码：1299 / 1304

页数：6

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