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The eROSITA instrument on-board Spectrum-Roentgen-Gamma openParSRGclosePar has performed the first imaging all-sky survey in the hard X-ray openPar2-10keVclosePar band. The final survey will be over 30 times deeper than previous hard X-ray surveys comma yielding a large and very pure sample of AGN. Combining eROSITA data with observations from other multi-wavelength missions comma a detailed picture of the AGN population can be constructed. We propose simultaneous NuSTAR+XMM follow up observations of a group of hard X-ray selected AGN observed with eROSITA. This pilot study will demonstrate the power of joint NuSTAR and XMM observations to break degeneracies present in different spectral models comma motivating future joint NuSTAR comma XMM and eROSITA investigations.

搭载于光谱-伦琴-伽马（Spectrum-Roentgen-Gamma，简称SRG）卫星的eROSITA仪器，完成了硬X射线（2-10 keV）波段的首次全天空成像巡天。此次最终巡天的探测深度较以往硬X射线巡天高30倍以上，将获得大样本且纯度极高的活动星系核（AGN）样本。将eROSITA数据与其他多波段观测任务的观测数据相结合，可构建出活动星系核族群的精细物理图景。我们提议对一批经eROSITA观测筛选出的硬X射线选源活动星系核，开展NuSTAR与XMM的同步后续观测。本试点研究将展示NuSTAR与XMM联合观测的强大能力，可破解不同光谱模型中存在的简并问题，从而为未来开展NuSTAR、XMM与eROSITA的联合研究提供有力支撑。