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arXiv 0810.3561astro-ph
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用MAGIC望远镜观测Willman 1卫星星系的VHE gamma-ray辐射上限

Upper Limits on the VHE gamma-ray Emission from the Willman 1 Satellite Galaxy with the MAGIC telescope

MAGIC Collaboration, E. Aliu

摘要:

本文介绍了2008年3月至5月期间用17米MAGIC望远镜对超暗矮星系Willman 1进行的15.5小时观测的结果。没有发现显著的$γ$射线辐射。我们推导出了积分通量在100 GeV以上的$10^{-12}$ ph cm $^{-2}$ s $^{-1}$数量级的上限,并与mSUGRA参数空间中几个已建立的中性伴子基准模型的预测进行了比较。中性伴子湮灭谱的定义包括最近量化的贡献后,内部韧致辐射的虚拟sparticles介导的湮灭。即使在最乐观的情况下,也需要三个数量级的通量提升因子来匹配我们的上限。然而,暗物质内在和外在性质的不确定性(例如,子结构的存在、索末菲效应)可以显著地减小该间隙。

英文摘要:

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 $γ$-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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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