论文标题
搜索带有Dampe观察的银河中心的黑洞周围的伽马射线线信号
Search for gamma-ray line signals around the black hole at the galactic center with DAMPE observation
论文作者
论文摘要
黑洞（BH）的绝热生长可能会增强其周围的暗物质（DM）密度，从而导致DM密度剖面的尖峰。银河系中心的超质量BH周围的尖峰可能会导致银河系中心（GC）的DM歼灭的伽马射线通量急剧增强。在这项工作中，我们分析了GC的最内向区域（即内部1 $^\ Circ $）的伽马射线数据，以搜索BH Spike的潜在线状信号。在DM颗粒的过程中，可以生成这种线状信号，从而将其歼灭到双光子中。我们采用来自暗物质粒子探险器（Dampe）的伽马射线数据。尽管Dampe的有效面积比Fermi-LAT小得多，但伽马射线线搜索可以从其前所未有的高能量分辨率中受益。在我们的分析中未发现明显的线样信号。我们基于此非检测，在歼灭的横截面上得出上限。我们发现，尽管Dampe的光子检测有效较小，但我们仍然可以在横截面（$ \ weled <σv\ right> \ prime> \ lisssim10^{ - 27} \，{\ rm cm^3 \，s^3 \，s^{ - 1}} $）中在非常明亮的模型中均为闪光模型。我们的结果表明，DM不会主要通过我们认为的质量范围内的$γγ$通道进行歼灭，或者在GC处存在不存在急剧密度的尖峰。
The adiabatic growth of a black hole (BH) may enhance the dark matter (DM) density surrounding it, causing a spike in the DM density profile. The spike around the supermassive BH at the center of the Milky Way may lead to a dramatic enhancement of the gamma-ray flux of DM annihilation from the galactic center (GC). In this work, we analyze the gamma-ray data of the innermost region (i.e., the inner 1$^\circ$) of the GC to search for potential line-like signals from the BH spike. Such line-like signals could be generated in the process of DM particles annihilating into double photons. We adopt the gamma-ray data from the Dark Matter Particle Explorer (DAMPE). Although the DAMPE has a much smaller effective area than the Fermi-LAT, the gamma-ray line search can benefit from its unprecedented high energy resolution. No significant line-like signals are found in our analysis. We derive upper limits on the cross section of the annihilation based on this non-detection. We find that despite the DAMPE's small effective area for photon detection, we can still place strong constraints on the cross section ($\left<σv\right>\lesssim10^{-27}\,{\rm cm^3\,s^{-1}}$) in the spike scenario due to the very bright model-expected flux from the spike. Our results indicate that either DM does not annihilate primarily through the $γγ$ channel in the mass range we considered or no sharp density spike is present at the GC.
