标题： 利用XRISM解锁衰变暗物质和微弱X射线源的发现潜力 显示英文标题

标题： Unlocking Discovery Potential for Decaying Dark Matter and Faint X-ray Sources with XRISM

摘要： 天体物理发射线源于粒子衰变，可以为暗物质（DM）的本质提供独特的见解。 通过结合背景和前景建模的专用模拟，我们全面证明，最近发射的XRISM空间望远镜凭借强大的X射线光谱能力，特别适合探测质量范围在几keV到几十keV之间的衰变暗物质，如惰性中微子和类轴子粒子。 我们通过考虑银河系银河暗物质晕，包括建立最佳视线搜索，以及矮星系，我们在其中确定Segue 1是一个非常有前景的目标，来分析和映射XRISM的暗物质发现潜力参数空间。 我们证明，仅需100 ks的曝光，XRISM/Resolve仪器就能够探测到几keV附近的未被充分研究的暗物质参数窗口，并以比现有Segue 1限制高两个数量级的灵敏度测试暗物质耦合。 此外，我们证明XRISM/Xtend仪器的灵敏度能够发现微弱天体物理X射线源的性质，特别是在Segue 1中，这可能有助于揭示恒星形成历史。 我们讨论了未来实验中改进探测器能量分辨率对衰变暗物质搜索的影响。 显示英文摘要

摘要： Astrophysical emission lines arising from particle decays can offer unique insights into the nature of dark matter (DM). Using dedicated simulations with background and foreground modeling, we comprehensively demonstrate that the recently launched XRISM space telescope with powerful X-ray spectroscopy capabilities is particularly well-suited to probe decaying DM, such as sterile neutrinos and axion-like particles, in the mass range of few to tens of keV. We analyze and map XRISM's DM discovery potential parameter space by considering Milky Way Galactic DM halo, including establishing an optimal line-of-sight search, as well as dwarf galaxies where we identify Segue 1 as a remarkably promising target. We demonstrate that with only 100 ks exposure XRISM/Resolve instrument is capable of probing the underexplored DM parameter window around few keV and testing DM couplings with sensitivity that exceeds by two orders existing Segue 1 limits. Further, we demonstrate that XRISM/Xtend instrument sensitivity enables discovery of the nature of faint astrophysical X-ray sources, especially in Segue 1, which could shed light on star-formation history. We discuss implications for decaying DM searches with improved detector energy resolution in future experiments.