Search for dark matter gamma-ray emission from the Andromeda Galaxy with the High-Altitude Water Cherenkov Observatory
Search for dark matter gamma-ray emission from the Andromeda Galaxy with the High-Altitude Water Cherenkov Observatory
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DOI：
10.1088/1475-7516/2018/06/043
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发表时间：
2018-04
影响因子：
6.4
通讯作者：
A. Albert;R. Alfaro;C. Álvarez;J. Álvarez;R. Arceo;J. C. Arteaga-Velázquez;D. Rojas;H. Solares-H.-Solar
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文献类型：
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作者：
A. Albert;R. Alfaro;C. Álvarez;J. Álvarez;R. Arceo;J. C. Arteaga-Velázquez;D. Rojas;H. Solares-H.-Solar
仙女座星系（M31）是一个离我们很近的（约780 kpc）星系，类似于我们的银河系。观测证据表明，它位于一个巨大的暗物质晕中，这使它成为暗物质搜索的一个很好的目标。我们利用高海拔水切伦科夫（HAWC）天文台1017天的数据对M31的伽马射线进行了搜索。凭借其广阔的视野和持续监控，HAWC非常适合在M31等扩展目标中搜索DM。在bb、tt、τ+τ−、μ+μ−和W+W−通道中，在1 ~ 100 TeV的DM质量范围内未检测到DM湮灭或衰减信号。因此，我们对这些过程提出了限制。我们的限值很好地补充了来自其他目标和工具的现有DM限值。具体来说，我们的基准模型中的DM衰减极限对bb和tt通道中从25 TeV到100 TeV的DM质量具有最大的约束。除了dm特有的极限外，我们还计算了M31在1 TeV至100 TeV的5个能量仓中的一般伽马射线通量极限。
The Andromeda Galaxy (M31) is a nearby (∼780 kpc) galaxy similar to our own Milky Way. Observational evidence suggests that it resides in a large halo of dark matter (DM), making it a good target for DM searches. We present a search for gamma rays from M31 using 1017 days of data from the High Altitude Water Cherenkov (HAWC) Observatory. With its wide field of view and constant monitoring, HAWC is well-suited to search for DM in extended targets like M31. No DM annihilation or decay signal was detected for DM masses from 1 to 100 TeV in the bb̄, tt̄, τ+τ−, μ+μ−, and W+W− channels. Therefore we present limits on those processes. Our limits nicely complement the existing body of DM limits from other targets and instruments. Specifically the DM decay limits from our benchmark model are the most constraining for DM masses from 25 TeV to 100 TeV in the bb̄ and tt̄ channels. In addition to DM-specific limits, we also calculate general gamma-ray flux limits for M31 in 5 energy bins from 1 TeV to 100 TeV.