• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >CONSTRAINING THE LOCATION OF MICROLENSING OBJECTS BY USING THE FINITE SOURCE EFFECT IN EAGLE EVENTS
【24h】

CONSTRAINING THE LOCATION OF MICROLENSING OBJECTS BY USING THE FINITE SOURCE EFFECT IN EAGLE EVENTS

机译：利用有限事件在老鹰事件中限制微透镜对象的位置

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We propose a new method to constrain the location of microlensing objects using EAGLE (extremely amplified gravitational lensing) events. We have estimated the rate of EAGLE events by taking the finite source effect into account. We found that the EAGLE event rate for using a 1 m class telescope whose limiting magnitude is V ～ 21 is the same as or higher than that of the ordinary microlensing events that have been found to date. We have also found that the fraction of transit EAGLE events is large enough to detect between 4% and 80% depending on the lens location. Since the lens proper motion can be measured for a transit event, one can distinguish whether the lens is a MACHO (massive compact halo object) in our halo or one of the known stars in the Large Magellanic Cloud from the proper motion measurement for each transit EAGLE event. Moreover, we show that the fraction of transit EAGLEs in all EAGLE events significantly depends on the lensing locations: the transit EAGLE fraction for the self-lensing case is 2-15 times larger than that for halo MACHOs. Thus, one can constrain the location of lens objects by the statistics of the transit events fraction. We show that we can reasonably expect 0-6 transit events out of 21 EAGLE events in 3 yr. We can also constrain the lens population properties at a greater than 99% confidence level depending on the number of transit events detected. We also present the duration of EAGLE events and show how an hourly observational mode is more suitable for an EAGLE event search program.
机译：我们提出了一种使用EAGLE（极端放大引力透镜）事件来限制微透镜物体位置的新方法。我们通过考虑有限源效应估计了EAGLE事件的发生率。我们发现，使用1 m级望远镜的极限幅度为V〜21的EAGLE事件发生率与迄今为止发现的普通微透镜事件相同或更高。我们还发现，随行EAGLE事件的比例很大，足以根据镜头位置检测到4％到80％。由于可以为一次过境事件测量镜头的适当运动，因此可以从每次过境的适当运动测量中区分出镜头是我们晕圈中的MACHO（大块致密光晕物体）还是大麦哲伦星云中的已知恒星之一EAGLE事件。此外，我们显示在所有EAGLE事件中，过境EAGLE的比例显着取决于镜头位置：自镜头情况下过境EAGLE的比例是光环MACHOs的2-15倍。因此，可以通过渡越事件分数的统计来约束镜片对象的位置。我们表明，我们可以合理地预期3年中21场EAGLE事件中有0-6次过境事件。根据检测到的过境事件的数量，我们还可以将晶状体的总体特性限制在大于99％的置信度上。我们还将介绍EAGLE事件的持续时间，并说明每小时观察模式如何更适合EAGLE事件搜索程序。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号