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arXiv 1105.6166astro-ph.IMastro-ph.GA
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欧洲航天局{ \Gaia }任务:探索银河系

The European Space Agency {\Gaia} mission: exploring the Galaxy

C. Jordi

摘要:

{ \Gaia }天体测量任务于2000年获得欧洲航天局的批准,航天器和有效载荷的建造正在进行中,将于2012年底发射。{ \Gaia }将连续扫描整个天空5年,产生位置和速度测量结果,其精度足以对整个银河系及更远的大约10亿颗恒星进行立体和运动学普查。主要的科学目标是量化银河系的早期形成和随后的动力学和化学演化。恒星巡天的完整性将达到$V = 20$等,在15等时的精确度约为25 $μ$。天体测量资料将与通过星上分光光度计和光谱仪获得的天体物理数据相结合,从而可以推导出恒星的化学组成和年龄。作为{ \Gaia }飞行任务的结果而获得和处理的数据估计约为1 PB。其中一个具有挑战性的问题是天体测量和天体物理数据之间的密切关系,这涉及到一个全球性的迭代解决方案,更新仪器参数,卫星的姿态,和观测对象的属性。欧洲共同体组织起来处理{ \Gaia }产品:(a)数据处理和分析联合会是负责准备和执行数据处理的欧洲联合努力,(b)GREAT网络是准备科学开发的合作平台。

英文摘要:

The {\Gaia} astrometric mission was approved by the European Space Agency in 2000 and the construction of the spacecraft and payload is on-going for a launch in late 2012. {\Gaia} will continuously scan the entire sky for 5 years, yielding positional and velocity measurements with the accuracies needed to produce a stereoscopic and kinematic census of about one billion stars throughout our Galaxy and beyond. The main scientific goal is to quantify early formation and the subsequent dynamic and chemical evolution of the Milky way. The stellar survey will have a completeness to $V = 20$ mag, with a precision of about 25 $μ$as at 15 mag. The astrometric information will be combined with astrophysical data acquired through on-board spectrophotometry and spectroscopy, allowing the chemical composition and age of the stars to be derived. Data acquired and processed as a result of the {\Gaia} mission are estimated to amount to about 1 petabyte. One of the challenging problems is the close relationship between astrometric and astrophysical data, which involves a global iterative solution that updates instruments parameters, the attitude of the satellite, and the properties of the observed objects. The European community is organized to deal with {\Gaia} products: (a) the Data Processing and Analysis Consortium is a joint European effort in charge of preparation and execution of data processing, (b) the GREAT network is a platform for collaboration on the preparation of scientific exploitation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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