AI 中文总结
研究针对爱因斯坦探针宽视场X射线望远镜面临的已知X射线源干扰问题，通过合并多源数据构建机载目录，经实时交叉匹配解耦背景源与瞬变警报流，验证了系统稳定性和效率，确保对天体物理发现快速准确响应。
AI 中文摘要
爱因斯坦探针（EP）致力于探索动态X射线宇宙并通过其宽视场X射线望远镜（WXT）实时捕捉瞬变事件。然而，WXT超过3600平方度的前所未有的大瞬时视场同时包含众多已知X射线源，区分真正的新瞬变源是关键观测挑战。为解决此问题，EP-WXT将已知X射线源的专用参考目录直接纳入其机载数据处理和触发系统。本文详细介绍了该机载目录的编制。通过合并来自ROSAT全天巡天、MAXI源列表和精心策划的恒星耀斑候选目录的数据，构建了一个包含9000个源的强大基线数据库。该目录为异常明亮的发射体提供坐标、基线计数率和空间否决半径。与该数据库的实时交叉匹配有效地将已知背景源与瞬变警报流解耦。最近的在轨操作验证了该目录驱动触发系统的高稳定性和效率。值得注意的是该目录成功屏蔽了来自已知活跃恒星的6100多个潜在触发。这证明了其在确保EP对真正天体物理发现的快速准确响应中的重要作用。
英文摘要
The Einstein Probe (EP) is dedicated to explore the dynamic X-ray universe and capture transient events in real time with its Wide-field X-ray Telescope (WXT). However, WXT's unprecedentedly large instantaneous field of view, exceeding 3,600 square degrees, simultaneously encompasses numerous known X-ray emitters. Distinguishing genuine novel transients from these persistent sources is a critical observational challenge. To resolve this, EP-WXT incorporates a dedicated reference catalog of known X-ray sources directly into its onboard data processing and triggering system. In this paper, we detail the compilation of this onboard catalog. By merging data from the ROSAT All Sky Survey, the MAXI source list, and a curated stellar flare candidate catalog, we constructed a robust baseline database of 9,000 sources. This catalog provides coordinates, baseline count rates, and spatial veto radii for exceptionally bright emitters. Real-time cross-matching against this database effectively decouples known background sources from the transient alert stream. Recent in-orbit operations validate the high stability and efficiency of this catalog-driven trigger system. Notably, the catalog successfully masked over 6,100 potential triggers from known active stars. This proves its essential role in ensuring EP's rapid and accurate response to genuine astrophysical discoveries.
Comments15 pages, 4 figures, and 2 tables. Accepted for publication in Research in Astronomy and Astrophysics (RAA)
