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

现在众所周知，宇宙充满了“黑暗”物质。为了以黑孔和小低光度星的形式研究暗物质，并检测到极性的行星，我们已经与新西兰的天文学家建立了MOA协作。我们使用引力微透镜的现象来检测此类物体，通过观察介入深色，巨大的物体产生的田间恒星的亮度的变化。 http：//www.vuw.ac.nz/scps/moa/.至今，我们已经在大麦芽云中观察到440万星，小麦芽岩中有9.3万恒星，在我们自己的银河系的凸起中观察到590万星。 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观察如此小的行星，并在新西兰和日本新闻媒体（广播电视和报纸）中广泛宣传，并表明，大多数行星系统不包含类似木星的行星； 3）开发了一种基于自2000年5月自2000年5月以来使用微分成像技术的数据分析的新方法，以提高可能的候选人，以提示可能候选人对微观范围的候选人对世界各地的社区进行微观范围的事件，使世界各地范围内传播了世界范围的天文学范围。自从男子气概的合作在1999年停止了警报以来，只有MOA才能在冬季观察大麦芽云； 4）发现了所谓的鹰事件的例子，这与通常通过其急剧升高的光曲线进行的重力镜头不同，这对黑暗物质和行星的较大杂志提供了更大的敏感性。云，现在正在检查其性质以及适当的尺寸和颜色校准。将来，为了获得有关暗物质问题的更好信息，并更多地了解了有关超极性行星及其形成的更多信息，有必要在程序中引入1.5米，F = 4望远镜。较少的