超致密暗物质微晕对各向同性射电背景的贡献
The contribution of ultracompact dark matter minihalos to the isotropic radio background
摘要：
超致密的小晕可能形成于宇宙的早期。其中暗物质湮灭是非常强烈的，由于陡峭的密度轮廓，$ρ\sim r^{-2.25}$。来自暗物质湮灭的高能电子和正电子可以与背景光子（例如CMB光子）逆康普顿散射（ICS）以获得更高的能量。另一方面，当它们遇到磁场时，也可以产生同步辐射。本文研究了由暗物质湮灭产生的射电、X射线和$γ$射线波段的UCMH信号。我们发现，对于射电辐射，UCMH可以为ARCADE 2观测到的射电过剩提供一种来源。但由于ICS效应产生的X射线信号或主要由暗物质瞬发辐射产生的$γ$射线信号将超过目前的观测，如Fermi，COMPTEL和CHANGEL。我们发现，最强的限制的分数UCMH来自X射线观测和无线电数据的约束是最弱的。
英文摘要：
The ultracompact minihalos could be formed during the earlier epoch of the universe. The dark matter annihilation within them is very strong due to the steep density profile, $ρ\sim r^{-2.25}$. The high energy electrons and positrons from the dark matter annihilation can inverse Compton scatter (ICS) with the background photons, such as CMB photons, to acquire higher energy. On the other hand, the synchrotron radiation can also be produced when they meet the magnetic field. In this paper, we study the signals from the UCMHs due to the dark matter annihilation for the radio, X-ray and $γ$-ray band. We found that for the radio emission the UCMHs can provide one kind of source for the radio excess observed by ARCADE 2. But the X-ray signals due to the ICS effect or the $γ$-ray signals mainly due to the prompt emission from dark matter would exceed the present observations, such as Fermi, COMPTEL and CHANDRA. We found that the strongest limits on the fraction of UCMHs come from the X-ray observations and the constraints from the radio data are the weakest.
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