A consistent microlensing model for the Galactic bar
A consistent microlensing model for the Galactic bar
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DOI：
10.1093/mnras/282.1.175
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发表时间：
1995-12
影响因子：
4.8
通讯作者：
HongSheng Zhao;R. Rich;D. Spergel
中科院分区：
文献类型：
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作者：
HongSheng Zhao;R. Rich;D. Spergel
我们计算了银河条的微透镜图。预测的事件发生率和事件持续时间分布与最近由MACHO和OGLE合作报告的55个事件一致。大多数事件都是由于星系棒近端恒星的透镜作用造成的_透镜质量函数约占透镜质量的30- 60%，因为褐矮星在20‘-60’的水平被剔除_为了使我们的模型对其他工作者有用，我们在星系坐标网格上列出了星系棒的光学深度和平均事件持续时间（缩放到I-M0透镜）。透镜和光源的距离和固有运动来源于恒星棒的一致动力学模型，该模型最初是为了拟合恒星光和恒星/气体的运动学数据而建立的。我们探索了几种可供选择的模型，我们发现我们的标准模型与观测结果最匹配。
We compute a microlensing map for the Galactic bar. The predicted event rate and event duration distribution are consistent with the 55 events recently reported by the MACHO and OGLE collaborations. Most of the events are due to lensing by stars in the near end of the bar_ Lens mass functions with about 30-60 per cent of the lens mass as brown dwarfs are rejected at 20'-60' levels_ To make our model useful for other workers, we tabulate the optical depth of the bar and average event duration (scaled to I-M0 lenses) on a grid of galactic coordinates. The distance and the proper motions of the lens and the source are derived from a consistent dynamical model of the stellar bar, which has originally been built to fit data on the stellar light and stellar/gas kinematics of the bar. We explore several alternative models, and we find that our standard model best matches the observations.