用HAWC天文台寻找不规则矮星系中的TeV暗物质
Searching for TeV Dark Matter in Irregular dwarf galaxies with HAWC Observatory
摘要：
我们提出的结果暗物质（DM）的搜索样本的31矮不规则（dIrr）星系的视野内的HAWC天文台。dIrr星系是DM占主导地位的对象，天体物理的伽马射线发射估计是可以忽略不计的次级伽马射线通量预期的湮灭或衰变的弱相互作用大质量粒子（WIMPs）。虽然我们没有看到任何统计上显着的DM信号dIrr星系，我们提出的排斥限制（$95\%~\text{C.L.}$）的湮灭截面和衰变寿命的WIMP候选人之间的$1$和$100~\text{TeV}$的质量。从dIrr星系的排斥限制是相关的和互补的基准矮椭球（dSph）星系。事实上，dIrr星系是运动学上不同于基准dSph的目标，保留了不同演化历史的足迹。我们比较的限制从dIrr星系的超微弱和经典的dSph星系以前观察到的HAWC。我们发现，约束是可比的限制，从经典的dSph星系和$\thicksim2$数量级弱于超微弱的dSph限制。
英文摘要：
We present the results of dark matter (DM) searches in a sample of 31 dwarf irregular (dIrr) galaxies within the field of view of the HAWC Observatory. dIrr galaxies are DM dominated objects, which astrophysical gamma-ray emission is estimated to be negligible with respect to the secondary gamma-ray flux expected by annihilation or decay of Weakly Interacting Massive Particles (WIMPs). While we do not see any statistically significant DM signal in dIrr galaxies, we present the exclusion limits ($95\%~\text{C.L.}$) for annihilation cross-section and decay lifetime for WIMP candidates with masses between $1$ and $100~\text{TeV}$. Exclusion limits from dIrr galaxies are relevant and complementary to benchmark dwarf Spheroidal (dSph) galaxies. In fact, dIrr galaxies are targets kinematically different from benchmark dSph, preserving the footprints of different evolution histories. We compare the limits from dIrr galaxies to those from ultrafaint and classical dSph galaxies previously observed with HAWC. We find that the contraints are comparable to the limits from classical dSph galaxies and $\thicksim2$ orders of magnitude weaker than the ultrafaint dSph limits.
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