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arXiv 2202.01400astro-ph.CO
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用暗能量巡天Y3 LSBG样品约束暗物质湮灭

Constraining Dark matter annihilation with Dark Energy Survey Y3 LSBG sample

Daiki Hashimoto, Atsushi J. Nishizawa, Masahiro Takada

摘要:

为了揭示暗物质粒子的本质,暗物质与标准模型粒子湮灭过程中产生的γ射线信号一直是主要的探测手段之一。高度DM为主的结构,如本地矮星系,和观察到的光子的结构的方向之间的互相关,已被探索,并提供严格的限制湮灭率。在我们以前的工作中,我们已经表明,它是足够的,知道的距离分布的星系样本和个人的距离测量是不需要约束的湮灭率。在这项工作中,我们将该方法应用于低表面亮度星系(LSBG)与未知的个人红移提供的暗能量调查(DES)第3年的数据。对于约24,000个物体的所有DES-LSBG,我们发现具有95%C. L.的bb通道的截面的上限。在DM质量为100 GeV时,为3*10^-25 cm ^3/s。为了更保守,我们从分辨的伽马射线点源中去除了1度内的约7000个LSBG,然后约束变得比所有DM质量范围内的所有样品弱30%。

英文摘要:

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.

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