论文标题
用暗能量调查限制暗物质歼灭y3 lsbg样品
Constraining Dark matter annihilation with Dark Energy Survey Y3 LSBG sample
论文作者
论文摘要
为了揭示暗物质（DM）颗粒的本质，在DM歼灭过程中产生的γ-射线信号已成为标准模型颗粒已成为主要探针之一。已经探索并在歼灭速率上探索并提供了严格的约束。在我们以前的工作中，我们已经表明，不需要知道星系样品的距离分布，并且不需要单个距离测量来限制歼灭速率。在这项工作中，我们将该方法应用于低表面亮度星系（LSBG），并在第3年数据（DES）数据中提供了未知的单个红移。所有DES-LSBG大约为24,000个物体，我们发现BB通道的横截面上限为95％C.L.在100 GEV的DM质量下为3*10^-25 cm^3/s。为了更加保守，我们从分辨的伽马射线点源中删除了1度以内的约7000个LSBG，然后约束比所有DM质量范围中所有样品的约束弱30％。
To reveal natures of the dark matter (DM) particles, a gamma-ray signal produced in annihilation processes of DM into the standard model particles has been one of the major probes. The cross-correlation between highly DM dominated structures, such as local dwarf galaxies, and observed photons in the direction of the structures, has been explored and provided stringent constraints on the annihilation rate. In our previous work, we have shown that it is sufficient to know the distance distribution of the galaxy sample and individual distance measurement is not required for constraining the annihilation rate. In this work, we apply the method to low-surface brightness galaxies (LSBGs) with unknown individual redshifts provided from the Dark Energy Survey (DES) Year 3 data. With all DES-LSBGs of about 24,000 objects, we find that the upper limits of the cross section for bb channel with 95% C.L. is 3*10^-25 cm^3/s at DM mass of 100 GeV. To be more conservative, we remove about 7000 LSBGs within 1 degree from resolved gamma-ray point sources and then the constraint becomes 30 % weaker than the one with all samples in all DM mass ranges.
