绿岸望远镜对Segue I中暗物质湮灭的限制
Green Bank Telescope Constraints on Dark Matter Annihilation in Segue I
摘要：
我们使用一个非检测在$ν= 1.4\,$ GHz的绿岸望远镜观测的超微弱的矮球状星系Segue I，它可以沉浸在一个不可忽略的晕磁场的银河系，把粒子暗物质的属性的界限。我们使用Einasto暗物质配置文件的星系模型，并计算预期的同步辐射通量从暗物质湮灭的磁场强度$B$，扩散系数$D_0$，和粒子质量$m_χ$为不同的湮灭通道的函数。这些数据强烈不利于湮没到$e^+e^-$的$m_χ\lesssim 50\,$ GeV，但不敏感的$b \bar b$通道。采用一个基准$B \sim 2\,μ$ G推断Segue I的接近银河系，我们的模型的湮灭$τ^+τ^-$与$m_χ= 30\,$ GeV需要一个中间值的$D_0$与数据的一致性。最令人信服的限制，获得了WIMP湮灭$μ^+μ^-$：我们排除$m_χ\lesssim 30\,$ GeV $\,\rightarrowμ^+μ^-$在95%的置信度，除非$D_0$超过银河系的值或$B$是显着小于我们所假设的。
英文摘要：
We use a non-detection in $ν= 1.4\,$GHz Green Bank Telescope observations of the ultra-faint dwarf spheroidal galaxy Segue I, which could be immersed in a non-negligible halo magnetic field of the Milky Way, to place bounds on particle dark matter properties. We model the galaxy using an Einasto dark matter profile, and compute the expected synchrotron flux from dark matter annihilation as a function of the magnetic field strength $B$, diffusion coefficient $D_0$, and particle mass $m_χ$ for different annihilation channels. The data strongly disfavor annihilations to $e^+e^-$ for $m_χ\lesssim 50\,$GeV, but are not sensitive to the $b \bar b$ channel. Adopting a fiducial $B \sim 2\,μ$G inferred from Segue I's proximity to the Milky Way, our models of annihilation to $τ^+τ^-$ with $m_χ= 30\,$GeV require an intermediate value of $D_0$ for consistency with the data. The most compelling limits are obtained for WIMP annihilation to $μ^+μ^-$: we exclude $m_χ\lesssim 30\,$GeV$\,\rightarrowμ^+μ^-$ at 95% confidence, unless $D_0$ exceeds the Milky Way value or $B$ is significantly smaller than we have assumed.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
