MaBµlS-2: high-precision microlensing modelling for the large-scale survey era
MaBµlS-2: high-precision microlensing modelling for the large-scale survey era
复制标题
MaB µlS-2：大规模测量时代的高精度微透镜建模
DOI：
10.1093/mnras/staa2375
复制
发表时间：
2020
影响因子：
4.8
通讯作者：
Specht D
中科院分区：
文献类型：
--
作者：
Specht D
银河系微透镜数据集现在包括超过104个事件，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）等设施一起进行，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）的事件的比例也将如此。分析这些数据需要一种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Manchester-Besançon微透镜模拟器（MaBμlS-2），它使用了一个版本的Besançon人口合成银河系模型，提供了很好的协议与恒星运动学观察到的哈勃太空望远镜（HST）对隆起。MaBμlS-2在几个光学到近红外通带中提供了对银河系隆起400 deg 2区域的微透镜光学深度、速率和平均时间尺度的高保真信噪比限制图。这些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MaBμlS-2与效率校正后的OGLE-IV 8000事件样本进行比较，结果显示，与以前版本的MaBμlS相比，一致性有了很大提高，并且成功地匹配了OGLE-IV事件率图中的小尺度结构特征。然而，证据仍然是一个小的预测不足的事件发生率每源和高估的时间尺度。MaBμlS-2可在线获得（www.mabuls.net，Specht & Kerins），以提供用户提供的测量震级、事件时标和相对自行切割的动态地图。
Galactic microlensing datasets now comprise in excess of 104events and, with the advent of next-generation microlensing surveys that may be undertaken with facilities such as the Rubin Observatory (formerly LSST) andRoman Space Telescope(formerlyWFIRST), 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 modelling approach. We present a new second-generation Manchester–Besançon Microlensing Simulator (MaBμlS-2), which uses a version of the Besançon population synthesis Galactic model that provides good agreement with stellar kinematics observed by theHubble Space Telescope(HST) towards the bulge. MaBμlS-2 provides high-fidelity signal-to-noise limited maps of the microlensing optical depth, rate and average time-scale towards a 400 deg2region 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 MaBμlS-2 with the efficiency-corrected OGLE-IV 8000 event sample shows a much improved agreement over the previous version of MaBμlS and succeeds in matching even small-scale structural features in the OGLE-IV event rate map. However, evidence remains for a small underprediction of the event rate per source and overprediction of the time-scale. MaBμlS-2 is available online (www.mabuls.net, Specht & Kerins) to provide on-the-fly maps for user-supplied cuts in survey magnitude, event time-scale and relative proper motion.