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Constraining the Location of Microlensing Objects by using the Finite Source Effect in EAGLE events

机译:通过在EAGLE事件中使用有限源效应来约束微透镜对象的位置

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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 in to account. We found that the EAGLE event rate for using a 1-m class telescope w hose limiting magnitude is $V \sim 21$ is the same as or higher than that of the ordinary microlensing events which have been found to date. We have also found that the fraction of transit EAGLE events is large enough to detect: between $4 \sim 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 hal o or one of the known stars in the Large Magellanic Cloud (LMC) from the proper motion measurement for each transit EAGLE event. Moreover, we show that the fraction of transit EAGLEs in all EAGLE events signif icantly depends on the lensing locations: the transit EAGLE fraction for the sel f-lensing case is $2 \sim 15$ times larger than that for halo MACHOs. Thus, one can constrain the location of lens objects by the statistics of the tr ansit events fraction. We show that we can reasonably expect $0 \sim 6$ transit events out of 21 EAGLE events in 3 years. We can also constrain the lens population properties at a gre ater than 99% confidence level depending on the number of transit events de tected. We also present the duration of EAGLE events, and show how an hourly ob servational mode is more suitable for an EAGLE event search program.
机译:我们提出了一种新的方法来限制使用EAGLE(极度引力透镜)事件的微透镜物体的位置。我们通过考虑有限源效应来估计EAGLE事件的发生率。我们发现,使用1-m级望远镜带软管极限幅度的EAGLE事件发生率是$ V \ sim 21 $,它等于或高于迄今为止发现的普通微透镜事件的发生率。我们还发现,过境EAGLE事件的分数足以检测到:$ 4 \ sim 80%$之间,具体取决于镜头位置。由于可以针对某一过境事件测量镜头的正常运动,因此可以从该正常运动中分辨出该镜头是我们光环中的MACHO(大型紧凑光晕物体)还是大麦哲伦星云(LMC)中的已知恒星之一每个过境EAGLE事件的测量值。此外,我们表明,在所有EAGLE事件中,过境EAGLE的比例显着取决于透镜的位置:sel f镜头案例的过境EAGLE比例是光环MACHOs的$ 2 \ sim 15 $倍。因此,可以通过瞬态事件分数的统计来限制镜片对象的位置。我们证明,我们可以合理地预期3年中21个EAGLE事件中有$ 0 \ sim 6 $转移事件。我们还可以根据检测到的过境事件的数量,将晶状体的总体特性限制在大于99%的置信度上。我们还介绍了EAGLE事件的持续时间,并说明了每小时观测模式如何更适合EAGLE事件搜索程序。

著录项

  • 作者

    Honma, M;

  • 作者单位
  • 年度 2000
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  • 原文格式 PDF
  • 正文语种 eng
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