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arXiv 0908.0195astro-ph.HEastro-ph.COastro-ph.GAhep-ph
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高分辨率模拟对间接暗物质散射的影响

Implications of High-Resolution Simulations on Indirect Dark Matter Searches

Lidia Pieri, Julien Lavalle, Gianfranco Bertone, Enzo Branchini

摘要:

我们研究了探测暗物质[DM]湮灭产物的前景,在目前可用的两个最高分辨率的数值模拟,即{ \it通过Lactea II}和{ \it Aquarius}的框架。我们提出了一种策略,以确定银河系中心周围的区域的形状和大小,最大限度地提高观察DM信号的概率,我们表明,虽然预测的通量可以不同的因素为10给定的DM候选人在两个模拟设置,搜索策略实际上保持不变,因为它依赖于湮灭通量的角廓线,而不是其归一化。我们提出了模拟伽马射线地图,考虑到在银河系中未解决的晕产生的漫发射,我们估计,在一个乐观的DM的情况下,几个单独的团块可以解决以上的背景与费米-LAT。最后,我们计算了正电子和反质子的能量相关的增强因子,并表明它们总是$\cal O$(1),因此它们不能导致解释最近的PAMELA,ATIC,Fermi和HESS数据所需的反物质通量的大增强。

英文摘要:

We study the prospects for detecting the annihilation products of Dark Matter [DM] in the framework of the two highest-resolution numerical simulations currently available, i.e. {\it Via Lactea II} and {\it Aquarius}. We propose a strategy to determine the shape and size of the region around the Galactic center that maximizes the probability of observing a DM signal, and we show that although the predicted flux can differ by a factor of 10 for a given DM candidate in the two simulation setups, the search strategy remains actually unchanged, since it relies on the angular profile of the annihilation flux, not on its normalization. We present mock gamma-ray maps that keep into account the diffuse emission produced by unresolved halos in the Galaxy, and we estimate that in an optimistic DM scenario a few individual clumps can be resolved above the background with the Fermi-LAT. Finally we calculate the energy-dependent boost factors for positrons and antiprotons, and show that they are always of $\cal O$(1), and therefore they cannot lead to the large enhancements of the antimatter fluxes required to explain the recent PAMELA, ATIC, Fermi and HESS data.

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