MaB $μ$ lS-2：大规模勘测时代的高精度微透镜建模
MaB$μ$lS-2: high-precision microlensing modelling for the large-scale survey era
摘要：
银河系微透镜数据集现在包括超过$10^4$事件，随着下一代微透镜调查的到来，可能会与鲁宾天文台（以前的LSST）和罗马空间望远镜（以前的WFIRST）等设施进行，这个数字将显着增加。具有可测量的高阶信息（如有限源效应和透镜-源相对自行）的事件分数也将如此。分析这些数据需要一个更复杂的银河系微透镜建模方法。我们提出了一个新的第二代曼彻斯特贝桑松微透镜模拟器（MaB $μ$ IS-2），它使用的贝桑松人口合成银河系模型的一个版本，提供了很好的协议与恒星运动学观察HST对隆起。MaB $μ$ 1S-2提供了微透镜光学深度、速率和平均时间尺度的高保真信噪比限制图，其朝向400 sq.度区域的银河系隆起在几个光学近红外通带。地图充分考虑了未解决的恒星背景以及边缘变暗的源配置文件。将MaB $μ$ 1S-2与效率校正的OGLE-IV 8，000事件样本进行比较，显示出与MaB $μ$ 1S的先前版本相比，一致性大大提高，并且成功地匹配OGLE-IV事件率图中的甚至小规模的结构特征。然而，仍有证据表明，每个来源的事件发生率存在小幅预测不足，而时间尺度则存在过度预测。MaB $μ$ IS-2可在线使用（），为用户提供的勘测震级、事件时标和相对自行的切割提供实时地图。<www.mabuls.net>
英文摘要：
Galactic microlensing datasets now comprise in excess of $10^4$ events, and with the advent of next generation microlensing surveys that may be undertaken with facilities such as the Rubin Observatory (formerly LSST) and Roman Space Telescope (formerly WFIRST), this number will increase significantly. So too will the fraction of events with measurable higher order information such as finite source effects and lens-source relative proper motion. Analysing such data requires a more sophisticated Galactic microlens modeling approach. We present a new second-generation Manchester-Besançon Microlensing Simulator (MaB$μ$lS-2), which uses a version of the Besançon population synthesis Galactic model that provides good agreement with stellar kinematics observed by HST towards the bulge. MaB$μ$lS-2 provides high-fidelity signal-to-noise limited maps of the microlensing optical depth, rate and average timescale towards a 400 sq. degree region of the Galactic bulge in several optical to near-infrared pass-bands. The maps take full account of the unresolved stellar background as well as limb-darkened source profiles. Comparing MaB$μ$lS-2 to the efficiency-corrected OGLE-IV 8,000 event sample shows a much improved agreement over the previous version of MaB$μ$lS, and succeeds in matching even small-scale structural features in the OGLE-IV event rate map. However, there remains evidence for a small under-prediction in the event rate per source and over-prediction in timescale. MaB$μ$lS-2 is available online (<www.mabuls.net>) to provide on-the-fly maps for user supplied cuts in survey magnitude, event timescale and relative proper motion.
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