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arXiv 1106.4264astro-ph.GA
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从Andromeda galaxy中潮汐流和壳层对速度相关暗物质相互作用的增强

Enhancements to velocity-dependent dark matter interactions from tidal streams and shells in the Andromeda galaxy

Robyn E. Sanderson, Roya Mohayaee, Joe Silk

摘要:

邻近星系周围的暗物质亚结构为无混淆间接探测暗物质提供了一个有趣的机会。假设横截面与索末菲效应所提出的暗物质粒子的相对速度成反比,我们计算了M31潮汐结构中暗物质自湮灭产生的伽马射线辐射对暗物质平滑背景分布的增强。与背景晕和速度无关截面的预测发射相比,结构中材料的低速度导致伽马射线发射显著增加。我们还计算了费米的预期信号,合理选择的暗物质参数。我们发现,对于一个截面成正比的平方反比的相对速度,增强的湮灭率是足够的空间相关性与恒星的流分量的截面测试的速度依赖性,给出足够的检测器的灵敏度。

英文摘要:

Dark matter substructure around nearby galaxies provides an interesting opportunity for confusion-free indirect detection of dark matter. We calculate the boost over a smooth background distribution of dark matter for gamma-ray emission from dark matter self-annihilations in tidal structure in M31, assuming a cross-section inversely proportional to the relative velocities of the dark matter particles as proposed by the Sommerfeld effect. The low velocity of the material in the structure results in a significant increase in gamma-ray emission compared to both the background halo and the predicted emission for a velocity-independent cross section. We also calculate the expected signal for Fermi, for reasonable choices of the dark matter parameters. We find that for a cross section proportional to the inverse-square of the relative velocity, the enhancement to the annihilation rate is sufficient to test the velocity dependence of the cross section by spatial correlation with the stellar component of the stream, given sufficient detector sensitivity.

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