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arXiv 0901.0985astro-ph.GA
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大质量致密天体的EROS微透镜搜索结果综述

Review of results from EROS Microlensing search for Massive Compact Objects

M. Moniez

摘要:

我们提出的EROS2搜索的结果,通过在麦哲伦星云的恒星引力微透镜的晕隐藏的星系物质。微透镜现象也在银河平面中被发现,在那里前景暗淡的恒星会透镜背景恒星。在大约7年的时间里,总共监测了6700万颗恒星。在银道面上已经发现了数百个微透镜候选者,但只有一个是在明亮的麦哲伦恒星的子样本中发现的。这一结果意味着质量范围为$10^{-7}M_\odot<M<5M_{\odot}$的大质量致密晕天体(machos)被排除为银河系晕的主要组成部分。

英文摘要:

We present the results of the EROS2 search for the hidden galactic matter of the halo through the gravitational microlensing of stars in the Magellanic clouds. Microlensing was also searched for and found in the Milky-Way plane, where foreground faint stars are expected to lens background stars. A total of 67 million of stars were monitored over a period of about 7 years. Hundreds of microlensing candidates have been found in the galactic plane, but only one was found towards the subsample of bright --well measured-- Magellanic stars. This result implies that massive compact halo objects (machos) in the mass range $10^{-7}M_\odot<M<5M_{\odot}$ are ruled out as a major component of the Milky Way Halo.

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