H.E.S.S.对暗物质湮灭朝向雕匠座和船底座矮星系的限制
H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies
摘要：
用H.E.S.S.观测了玉夫座和船底座矮球状星系。2008年1月至2009年12月期间的切伦科夫望远镜阵列。这两组数据分别由11.8小时和14.8小时的高质量数据组成。在220 GeV和320 GeV以上的标称位置上，没有探测到伽马射线信号。在95% C. L.时伽马射线通量的上限。假设在TeV范围内，在10^-13到10^-12 cm^-2 s ^-1的能级上可以得到两种形式的光谱能量分布（一种是幂律形状，另一种是由暗物质湮灭得到的）。根据所使用的暗物质晕模型，对玉夫座和船底座矮星系的速度加权暗物质粒子湮灭截面的限制范围从<σv> ~ 10^-21 cm ^3 s ^-1到<σv> ~ 10^-22 cm ^3 s ^-1。可能的增强的伽马射线通量进行了研究：索末菲效应，这被发现排除一些暗物质粒子质量，内部韧致辐射和团块的暗物质晕分布。
英文摘要：
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 and 14.8 hours 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% C.L. 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 to 10^-12 cm^-2s^-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 <σv> ~ 10^-21 cm^3s^-1 down to <σv> ~ 10^-22 cm^3s^-1 depending 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.
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