从EGRET观测看费米星系暗物质晕探测
Perspective of Galactic dark matter subhalo detection on Fermi from the EGRET observation
摘要：
本文研究了费米卫星上银河系暗物质晕的可探测性。在假设暗物质湮灭解释了EGRET发现的银河系弥散$γ$射线的“GeV过量”以及$γ$射线通量主要由暗物质的次晕贡献的情况下，我们计算了费米可能探测到的暗物质次晕的预期数量。我们发现，费米可能会发现几十到几百个subhalo在1年的全天调查。由于EGRET观测是作为一个归一化，这种预测是独立的粒子物理性质的暗物质。详细讨论了预测的不确定性。我们发现，主要的不确定性来自于subhaloes的质量函数，即，亚晕是“点状”（富含高质量）还是“弥散状”（富含低质量）。其他不确定性，如背景估计和观测误差，将贡献一个因子$2\sim 3$。
英文摘要：
The perspective of the detectability of Galactic dark matter subhaloes on the Fermi satellite is investigated in this work. Under the assumptions that dark matter annihilation accounts for the "GeV excess" of the Galactic diffuse $γ$-rays discovered by EGRET and the $γ$-ray flux is dominated by the contribution from subhaloes of dark matter, we calculate the expected number of dark matter subhaloes that Fermi may detect. We show that Fermi may detect a few tens to several hundred subhaloes in 1-year all sky survey. Since EGRET observation is taken as a normalization, this prediction is independent of the particle physics property of dark matter. The uncertainties of the prediction are discussed in detail. We find that the major uncertainty comes from the mass function of subhaloes, i.e., whether the subhaloes are "point like" (high-mass rich) or "diffuse like" (low-mass rich). Other uncertainties like the background estimation and the observational errors will contribute a factor of $2\sim 3$.
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