UPPER LIMITS ON THE VHE GAMMA-RAY EMISSION FROM THE WILLMAN 1 SATELLITE GALAXY WITH THE MAGIC TELESCOPE
作者： E Aliu , H Anderhub , LA Antonelli , P Antoranz , M Backes
DOI: 10.1088/0004-637X/697/2/1299
关键词: Annihilation 、 Milky Way 、 Gamma ray 、 Ursa Major 、 Physics 、 Astrophysics 、 Satellite galaxy 、 Neutralino 、 Dwarf galaxy 、 Dark matter 、 Astronomy
摘要: We present the result of observation ultrafaint dwarf galaxy Willman 1 performed with 17 m MAGIC telescope during 15.5 hr between March and May 2008. No significant gamma-ray emission was found. derived upper limits order 10(-12) ph cm(-2) s(-1) on integral flux above 100 GeV, which we compare predictions from several established neutralino benchmark models in mSUGRA parameter space. The annihilation spectra are defined after including recently quantified contribution internal bremsstrahlung virtual sparticles that mediate annihilation. Flux boost factors three orders magnitude required even most optimistic scenario to match our limits. However, uncertainties dark matter intrinsic extrinsic properties (e.g., presence substructures, Sommerfeld effect) may significantly reduce this gap.
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