论文标题
从高纬度HAWC身份不明的来源对暗物质an灭的限制
Constraints to dark matter annihilation from high-latitude HAWC unidentified sources
论文作者
论文摘要
$λ$ CDM宇宙学框架预测了我们自己的银河系中成千上万的Subhalos的存在不足以保留重子并变得可见。然而，只要暗物质（DM）是由弱相互作用的巨大颗粒（wimps）制成的，它们可能会自动化，并且会在伽马射线目录中以未识别的伽马射线源（UNID）形式出现。确实，事实证明，Unids是使用伽马射线进行DM搜索的竞争目标。在这项工作中，我们关注三个高纬度（$ | b | \ geq 10^\ circ $）来源，在高海拔水cherenkov（HAWC）天文台的2HWC目录中，在其他范围内没有关联。实际上，在考虑760天的数据时，只有这些来源中只有一个2HWC J1040+308高于HAWC检测阈值，比原始2HWC目录中的曝光时间高1.5。其他仪器，例如费米 - 拉特（Fermi-Lat）或较低能量的Veritas，无法检测到此源。同样，该UNID被报告为空间扩展，使其在DM搜索上下文中更加有趣。在等待更多可能会进一步阐明该来源本质的数据时，我们通过将这种HAWC UNID与基于银河系亚乳子对人群的最新N体宇宙学模拟进行比较，在歼灭横截面上设置了竞争上限。我们发现这些限制因素对于重量较重特别有竞争力，即$ \ sim 25 $ 25 $（40）TEV在$ b \ bar {b} $（$τ^+τ^ - $）nihilation通道的情况下，达到velocity-a velocity-averaged velocity-a velocity-averaged velocity-averaged velocity-averaged-average-25} $ 25} $ 25} $ 25} $ cdot $ cdot10^$ 5} $ cm^3S^{ - 1} $。尽管远离热遗物横截面值，但获得的限制是独立的，并且与根本不同的DM分析和目标的限制非常互补，这再次证明了这种DM搜索方法的高潜力。
The $Λ$CDM cosmological framework predicts the existence of thousands of subhalos in our own Galaxy not massive enough to retain baryons and become visible. Yet, some of them may shine in gamma rays provided that the dark matter (DM) is made of weakly interacting massive particles (WIMPs), that would self-annihilate and would appear as unidentified gamma-ray sources (unIDs) in gamma-ray catalogs. Indeed, unIDs have proven to be competitive targets for DM searches with gamma rays. In this work, we focus on the three high-latitude ($|b|\geq 10^\circ$) sources present in the 2HWC catalog of the High Altitude Water Cherenkov (HAWC) observatory with no associations at other wavelenghts. Indeed, only one of these sources, 2HWC J1040+308, is found to be above the HAWC detection threshold when considering 760 days of data, a factor 1.5 more exposure time than in the original 2HWC catalog. Other instruments such as Fermi-LAT or VERITAS at lower energies do not detect this source. Also, this unID is reported as spatially extended, making it even more interesting in a DM search context. While waiting for more data that may shed further light on the nature of this source, we set competitive upper limits on the annihilation cross section by comparing this HAWC unID to expectations based on state-of-the-art N-body cosmological simulations of the Galactic subhalo population. We find these constraints to be particularly competitive for heavy WIMPs, i.e., masses above $\sim 25$ (40) TeV in the case of the $b\bar{b}$ ($τ^+τ^-$) annihilation channel, reaching velocity-averaged cross section values of $2\cdot10^{-25}$ ($5\cdot10^{-25}$) $cm^3s^{-1}$. Although far from the thermal relic cross section value, the obtained limits are independent and nicely complementary to those from radically different DM analyses and targets, demonstrating again the high potential of this DM search approach.
