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A comprehensive study of dark halo with a large CCD camera

利用大型 CCD 相机对暗晕进行综合研究

基本信息

批准号：
11694071
负责人：
MURAKI Yasushi
金额：
$ 10.5万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11694071/
关键词：
gravitational microlensing Magellanic cloud black hole extra-solar planet EAGLE event long-period variables dark matter difference imaging analysis 重力レンズ CCDカメラ地球型惑星ガンマ線バースト星の大量連続測光

项目摘要

It is now well known that the Universe is filled with 'dark' matter. In order to investigate dark matter in the form of black holes and small low luminosity stars as well as to detect extra-solar planets, we have set up the MOA collaboration together with astronomers in New Zealand. We use the phenomenon of gravitational micro-lensing to detect such objects by observing the variations of the brightness of field stars produced by intervening dark, massive objects. See http : //www.vuw.ac.nz/scps/moa/.To date we have observed 4.4 million stars in the Large Magellanic cloud, 930 thousand stars in the Small Magellanic Cloud and 5.9 million stars in the bulge of our own galaxy. As a result of these observations, which have involved the analysis of enormous amounts of data by our group, we have :1) discovered a very interesting event in which the light intensity from a star increased over a period of 80 days, suggesting (with 40% probability) that a black hole was involved ;2) found indicati … More ons for the presence of one or even two Earth-sized planets close to a lens star and published the results in the Astrophysical Journal (this may be the first observation of such small planets and was given wide publicity in New Zealand and Japanese news media - radio TV and newspapers) and have shown that most planetary systems do not contain Jupiter-like planets ;3) developed a new method of data analysis based on a differential imaging technique which has been used since May 2000 to issue alerts of possible candidates for micro-lensing events to the world-wide astronomical community. This has been much appreciated since the MACHO collaboration stopped their alerts in 1999 and only MOA can observe the Large Magellanic Cloud in winter time ;4) have found examples of so-called EAGLE events, which differ from the usual gravitational lensing by their sharply-rising light curve, and which provide greater sensitivity for dark matter and planet detection.5) confirmed the existence of the overtone pulsators in Mira variables in the Large Magellanic Cloud and are now examining their nature together with appropriate magnitude and color calibrations.In future, in order to obtain much better information on the dark matter problem and to learn more about extra-solar planets and their formation, it will be necessary to introduce a 1.5 metre, f=4 telescope into the program. Less

现在大家都知道，宇宙充满了“暗”物质。为了研究黑洞和低光度小恒星形式的暗物质以及探测太阳系外行星，我们与新西兰的天文学家建立了MOA合作。我们使用引力微透镜现象来探测这类天体，方法是观察由暗质量天体干涉产生的场星亮度的变化。参见http：//www.vuw.ac.nz/scps/moa/。到目前为止，我们已经在大麦哲伦星云中观测到了440万颗恒星，在小麦哲伦星云中观测到了93万颗恒星，在我们银河系的凸起中观测到了590万颗恒星。作为这些观测的结果，其中包括我们小组对大量数据的分析，我们发现：1)发现了一个非常有趣的事件，在这个事件中，来自一颗恒星的光强度在80天的时间里增加了，这表明(有40%的可能性)涉及到一个黑洞；2)发现了Indicati…(2)研究人员发现了更多关于在透镜恒星附近存在一颗甚至两颗地球大小的行星的信息，并在《天体物理杂志》上发表了这一结果(这可能是对这类小行星的首次观测，新西兰和日本新闻媒体--电台、电视和报纸也对此进行了广泛报道)，并显示了大多数行星系统不包含类木星的行星；3)开发了一种新的数据分析方法，该方法基于微分成像技术，自2000年5月以来一直用于向世界天文学发出关于可能存在微透镜事件的警报。自从大男子主义合作小组在1999年停止了他们的警报，只有气象局可以在冬季观测到大麦哲伦云以来，这一点一直受到人们的赞赏；4)发现了所谓的Eagle事件的例子，这些事件由于其急剧上升的光曲线而不同于通常的引力透镜，为暗物质和行星的探测提供了更高的灵敏度。5)证实了大麦哲伦星云中Mira变星中泛音脉动子的存在，现在正在检查它们的性质，并进行适当的星等和颜色校准。未来，为了获得更好的关于暗物质问题的信息，了解更多关于太阳系外行星及其形成的信息，有必要在该计划中引入一台1.5米、f=4的望远镜。较少