论文标题
VVV调查微透镜：远方磁盘中带有源的候选事件
VVV survey microlensing: candidate events with source in the far disk
论文作者
论文摘要
VVV微透镜搜索最近在-10.00 <l <10.44度内对银河平面的区域进行了调查。在近红外（IR）中，发现了数百个微透镜事件。在本文中，我们探索了可能位于银河系远处的背景源的微卷事件，而不是凸起。我们讨论了在银河平面内不同位置的微透镜透镜和源的可能配置。然后，我们使用VVV近IIR颜色磁性图的局部红色团块搜索这些事件。根据估计的距离和适当的运动，n = 20事件可能在远方磁盘中具有来源。远盘来源的候选者平均显示更长的时间尺度（TE = 49.3 +-7.9天），比凸起红色团块源的时间尺度分布的平均值（TE = 36.4 +-1.1天）。我们得出的结论是，该区域的微卷事件的种群-10.00 <l <10.44，-0.46 <b <0.65度。包含不可忽略的事件数量，候选远处源（〜11％）。鉴于未来的微透镜计划与近红外的罗马太空望远镜（以前是WFIRST）相关。
The VVV microlensing search has recently surveyed the region of the Galactic plane at b=0 within -10.00 < l < 10.44 deg. in the near-infrared (IR), discovering hundreds of microlensing events. In this paper we explore the microlensing events with background sources that might be located in the far disk of the Galaxy, beyond the bulge. We discuss the possible configurations for the microlensing lenses and sources located at different places within the Galactic plane. Then we search for these events using the local red clump centroids of the VVV near-IR color-magnitude diagrams. According to the estimated distances and proper motions, N=20 events may have sources located in the far disk. The candidates for far-disk sources show on average longer timescales (tE= 49.3 +- 7.9 days) than the mean of the timescale distribution for the bulge red clump sources (tE= 36.4 +- 1.1 days). We conclude that the population of microlensing events in the region -10.00 < l < 10.44, -0.46 < b < 0.65 deg. contains a non-negligible number of events with candidate far-disk sources (~ 11 %). Our results are relevant in view of the future microlensing plans with the Roman Space Telescope (formerly WFIRST) in the near-IR.
