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Infrared Observation of Galactid Halo

银河晕的红外观测

基本信息

批准号：
06402002
负责人：
MATSUMOTO Toshio
金额：
$ 22.14万
依托单位：
The Institute of space and Astronautical Science (1996)Nagoya University (1994-1995)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06402002/
关键词：
Infrared Astronomy Dark matter Rocket experiment Infrared Imaging Dark matter Intrared Astronomy Brown dwarf Halo of the galaxy Space obserration 赤外線天文学暗黒物質ロケット観測

项目摘要

Dark matter in the Universe is one of the most important topics of the modern astronomy. The purpose of this research is to find the contribution of low mass stars to the galactic dark matter.The rocket payload was developed under the collaboration with US people. The rocket experiments were carried out on June 1996 and May 1997 at White Sands with using sounding rocket of NASA.The first infrared image of the external galaxy NGC4565 was successfully obtained.The obtained data were analyzed carefully, and following new results were delineated.The extended emission component was detected over 5'from the center. This emission component shows r^<-3.6> dependence that is different from r^<-1> dependence expected from the flat rotation curve. By comparing with mass distribution estimated from the rotation curve, lower limit of ^- 300 was obtained for the mass to luminosity ration, M/L,at 3.5-5mum. This value indicates that ordinary stars can not be dark matter and brown dwarfs are likely to be origin of the dark matter if dark matter consists of point sources.On the other hands, recent experiments of MACHO indicate that the mass of MACHO is ^-0.5M_0 (not less than 0.10.1M_0) and half of the dark matter can be explaened by MACHO.The possible candidates of the dark matter that iare consistent both with MACHO experimints and our result are now white dwarfs and black holes, although their origins are still remaind to be problems.

宇宙中的暗物质是现代天文学最重要的课题之一。这项研究的目的是寻找低质量恒星对银河系暗物质的贡献。火箭有效载荷是与美国人合作开发的。 1996年6月和1997年5月，利用美国宇航局探空火箭在白沙进行了火箭实验。成功获得了第一张外星系NGC4565的红外图像。对获得的数据进行了仔细分析，并描绘了以下新结果。在距中心5英尺以上的地方检测到了延伸发射分量。该发射分量显示出与从平坦旋转曲线预期的r^<-1>依赖性不同的r^<-3.6>依赖性。通过与从旋转曲线估计的质量分布进行比较，得到质量光度比M/L的下限^- 300，在3.5-5mum。这个值表明，普通恒星不可能是暗物质，如果暗物质由点源组成，则褐矮星很可能是暗物质的起源。另一方面，最近的MACHO实验表明，MACHO的质量为^-0.5M_0（不小于0.10.1M_0），一半的暗物质可以用MACHO解释。暗物质的可能候选者与MACHO实验和MACHO均一致。我们现在的结果是白矮星和黑洞，尽管它们的起源仍然是一个问题。