Planning a Large-Scale Near-Infrared Survey

规划大规模近红外测量

基本信息

批准号：
10640239
负责人：
NAKAJIMA Tadashi
金额：
$ 1.79万
依托单位：
National Astronomical Observatory
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640239/
关键词：
Brown Dwarfs Star Count Interferometry 赤外線クエーサー

项目摘要

Main topics of this research comprises studies of brown dwarfs, an interpretation of stellar objects in a near-infrared deep survey, and the sensitivity analysis of an imaging space infrared interferometer.From the study of young brown dwarfs, it became clear that brown dwarfs are formed both as isolated objects and as companions to more massive objects. We analyzed the potentials of space missions for brown dwarf research and found that space missions are capable of detecting many cold brown dwarfs, while ground based observations are sensitive only to warm brown dwarfs. We otained time resolved spectra of the cool brown dwarfs, SDSS 1624+00 to study weather in this brown dwarf. Although the time span was as short as 80 minutes, we were able to detect some variability.A deep survey of a small area is complementary to a wide-field survey in the sense that the deep small-field survey elucidate the universe at faint magnitudes. By constructing star count models from the data of the deep survey, we can predict stellar/substellar populations found by surveys in general. The models we generated predict the brown dwarf count of the UKIRT Wide Field Survey and depict the Galaxy seen by the Next Generation Space Telescope.The ultimate instrument to follow up objects found by a survey with high angular resolution is a space interferometer. The space interferometer can perform a deep survey in the far infrared and count galaxies to study cosmology. We first derived formulae of sensitivities of space infrared interferometers and then applied them to study the performance of currently planned Terrestrial Planet Finder and Darwin. We found that radiation cooled interferometers are more sensitive than cooled telescopes and cooled interferometers are capable of studying observational cosmology.

这项研究的主要主题包括对棕色矮人的研究，在近红外深度调查中对恒星对象的解释以及对成像太空红外干涉仪的敏感性分析。从对年轻的棕色矮矮人的研究，棕色矮矮人既形成棕色矮人又形成了孤立的对象和伴侣，以便将其形成更大的物体。我们分析了棕色矮人研究的太空任务潜力，发现太空任务能够检测许多冷棕色矮人，而基于地面的观测值仅对温暖的棕色矮人敏感。我们为凉爽的棕色矮人（SDSS 1624+00）的时间分解了时间，以研究该棕色矮人的天气。尽管时间跨度短于80分钟，但我们能够检测到一些可变性。对小面积的深入调查是与宽场调查的补充，从某种意义上说，深度小场调查以微弱的幅度阐明了宇宙。通过从深度调查的数据中构建星数模型，我们可以预测调查总体上发现的恒星/替代种群。我们生成的模型预测了UKIRT广场调查的棕色矮人数量，并描绘了下一代空间望远镜看到的星系。跟进具有高角度分辨率的调查发现的最终仪器是空间干涉仪。空间干涉仪可以在远红外和计数星系中进行深入的调查以研究宇宙学。我们首先得出了空间红外干涉仪敏感性的公式，然后将其应用于当前计划的陆地田园发现者和达尔文的性能。我们发现，辐射冷却干涉仪比冷却的望远镜更敏感，而冷却的干涉仪能够研究观察宇宙学。