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.

本研究的主要内容包括褐矮星研究、近红外深巡星体解释以及成像空间红外干涉仪的灵敏度分析。通过对年轻褐矮星的研究，我们清楚地知道褐矮星是既形成为孤立的物体，也形成为更大质量物体的伴生体。我们分析了太空任务对棕矮星研究的潜力，发现太空任务能够探测到许多冷棕矮星，而地面观测仅对暖棕矮星敏感。我们获得了冷褐矮星 SDSS 1624+00 的时间分辨光谱，以研究该褐矮星的天气。尽管时间跨度只有80分钟，但我们还是能够检测到一些变化。小区域的深度勘测与大视场勘测是互补的，因为深度小视场勘测可以在微弱的星等上阐明宇宙。。通过根据深度巡天数据构建恒星计数模型，我们可以预测一般巡天发现的恒星/次星种群。我们生成的模型预测了 UKIRT 广域巡天的褐矮星数量，并描绘了下一代太空望远镜看到的星系。以高角分辨率跟踪巡天发现的物体的终极仪器是空间干涉仪。空间干涉仪可以在远红外区域进行深度探测，并对星系进行计数，以研究宇宙学。我们首先推导了空间红外干涉仪的灵敏度公式，然后将其应用于研究目前计划中的类地行星探测器和达尔文探测器的性能。我们发现辐射冷却干涉仪比冷却望远镜更灵敏，并且冷却干涉仪能够研究观测宇宙学。