Parkes observations for project P1163 semester 2022OCTS_01

We propose to observe the core region of the Sagittarius dwarf spheroidal (Sgr dSph) galaxy with the Parkes Ultra-Wideband Low (UWL) receiver and the goal is to search for new millisecond pulsars (MSPs). Recent studies of diffused gamma-ray emission in the Galactic Bulge strongly indicate that Sgr dSph might also be shining at high energies. The summed gamma-ray emission from a population of millisecond pulsars is the most promising alternative explanation. The discovery of MSPs in Sgr dSph will allow us to study pulsar formation and evolution in various environments, probe the evolutionary history of the galaxy and interstellar medium in the Milky Way's halo, and constrain the potential contributions from dark matter annihilation to the observed gamma-ray emission.

本研究提议利用帕克斯超宽频低（UWL）接收机，对人马座矮椭球星系（Sgr dSph）的核心区域进行观测，旨在搜寻新的毫秒脉冲星（MSPs）。近期针对银河核球弥漫伽马射线辐射的相关研究强烈暗示，人马座矮椭球星系（Sgr dSph）或许也存在高能辐射。而由毫秒脉冲星群体产生的伽马射线辐射总和，是该辐射最具潜力的替代性解释。在人马座矮椭球星系中发现毫秒脉冲星（MSPs），将使我们得以研究不同环境下的脉冲星形成与演化机制，探究该星系的演化历史以及银河系晕内的星际介质，并可约束暗物质湮灭对观测到的伽马射线辐射的潜在贡献。