Gaia: 3-dimensional census of the Milky Way Galaxy
Gaia: 3-dimensional census of the Milky Way Galaxy
复制标题
盖亚：银河系的 3 维普查
DOI：
10.1080/00107514.2018.1439700
复制
发表时间：
2018
影响因子：
2
通讯作者：
Gilmore G
中科院分区：
文献类型：
--
作者：
Gilmore G
与地面观测相比，空间天体测量具有独特的优势：全天覆盖，相对稳定，温度和重力不变，操作环境提供的精度，准确度和样本量比地面结果大几个数量级。更重要的是，绝对天体测量是可能的。欧洲航天局的基石使命盖亚正在实现这一承诺。盖亚提供了5维相空间测量，3个空间坐标和2个天空平面中的空间运动，用于银河系恒星种群的代表性样本（超过20亿颗恒星，占半径50%以上的恒星的1%）。完整的6-D相空间数据是从3亿颗最亮恒星的视线（径向）速度提供的。这些数据对从太阳系到宇宙学的天体物理学和基础物理学做出了重大贡献。一场知识革命正在进行。
Astrometry from space has unique advantages over ground-based observations: the all-sky coverage, relatively stable, and temperature and gravity invariant, operating environment delivers precision, accuracy and sample volume several orders of magnitude greater than ground-based results. Even more importantly, absolute astrometry is possible. The European Space Agency Cornerstone mission Gaia is delivering that promise. Gaia provides 5-D phase space measurements, 3 spatial coordinates and 2 space motions in the plane of the sky, for a representative sample of the Milky Way’s stellar populations (over 2 billion stars, being ~1% of the stars over 50% of the radius). Full 6-D phase space data are delivered from line-of-sight (radial) velocities for the 300 million brightest stars. These data make substantial contributions to astrophysics and fundamental physics on scales from the Solar System to cosmology. A knowledge revolution is underway.