标题： 中国的欧洲eXTP（增强型X射线时变和偏振）任务的广域监视器（WFM） 显示英文标题

标题： The Wide Field Monitor (WFM) of the China-Europe eXTP (enhanced X-ray Timing and Polarimetry) mission

摘要： eXTP任务是中国科学院（CAS）的一个重大项目，欧洲也深度参与其中。 其科学载荷包括四个仪器：SFA、PFA、LAD和WFM。 它们提供了前所未有的同时宽能段X射线测时和偏振灵敏度。 一个大型的欧洲财团正在为eXTP的研究做出贡献，包括科学和仪器方面。 预计欧洲将提供四个仪器中的两个：LAD和WFM；LAD由意大利主导，WFM由西班牙主导。 eXTP的WFM基于最初为LOFT ESA M3任务提出的设想，并经历了阶段A可行性研究。 它将是一个大视场X射线监测仪器，在2-50 keV能量范围内工作，采用大面积硅漂移探测器（SDDs），类似于LAD所使用的，但具有更好的空间分辨率。 WFM将由3对编码掩膜相机组成，总联合视场（FoV）在零响应时为90x180度，源定位精度约为1角分。 WFM的主要目标是为SFA、PFA和LAD的目标机会观测提供触发，以执行核心科学计划，该计划专门研究极端密度、重力和磁场条件下的物质。 此外，WFM前所未有的大视场和成像能力，最低可达2 keV，将使eXTP能够发现可变和瞬变X射线天空的重要现象，并提供对“天文台科学”中涵盖的广泛天体物理对象的X射线覆盖，例如伽马射线暴、快速射电暴和引力波电磁对应体。 在本文中，我们对WFM仪器进行了概述，解释了其设计、配置和预期性能。 显示英文摘要

摘要： The eXTP mission is a major project of the Chinese Academy of Sciences (CAS), with a large involvement of Europe. Its scientific payload includes four instruments: SFA, PFA, LAD and WFM. They offer an unprecedented simultaneous wide-band Xray timing and polarimetry sensitivity. A large European consortium is contributing to the eXTP study, both for the science and the instrumentation. Europe is expected to provide two of the four instruments: LAD and WFM; the LAD is led by Italy and the WFM by Spain. The WFM for eXTP is based on the design originally proposed for the LOFT ESA M3 mission, that underwent a Phase A feasibility study. It will be a wide field of view X-ray monitor instrument working in the 2-50 keV energy range, achieved with large-area Silicon Drift Detectors (SDDs), similar to the ones used for the LAD but with better spatial resolution. The WFM will consist of 3 pairs of coded mask cameras with a total combined field of view (FoV) of 90x180 degrees at zero response and a source localisation accuracy of ~1 arc min. The main goal of the WFM is to provide triggers for the target of opportunity observations of the SFA, PFA and LAD, in order to perform the core science programme, dedicated to the study of matter under extreme conditions of density, gravity and magnetism. In addition, the unprecedented combination of large field of view and imaging capability, down to 2 keV, of the WFM will allow eXTP to make important discoveries of the variable and transient X-ray sky, and provide X-ray coverage of a broad range of astrophysical objects covered under 'observatory science', such as gamma-ray bursts, fast radio bursts, gravitational wave electromagnetic counterparts. In this paper we provide an overview of the WFM instrument, explaining its design, configuration, and anticipated performance.