Collaborative Research: Tracking Galaxy Growth with 200,000 Spectroscopic Redshifts

合作研究：利用 200,000 个光谱红移追踪星系的生长

• 批准号: 0908246
• 负责人: Alison Coil
• 金额: $ 24.59万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908246&HistoricalAwards=false
• 关键词: Collaborative; Research; Tracking; Galaxy; Growth

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Dr Coil, Dr Blanton and Dr Eisenstein will analyze their large survey of 300,000 galaxies, to understand the growth and evolution of the stellar bodies of galaxies over the past several billion years in the context of the current standard Cold Dark Matter models. The team has surveyed a region of 11 square degrees with prism spectroscopy from the 6.5-meter Magellan telescope. They determined the redshifts z, and hence the distances, for galaxies seen as they were between 2.5 and 8.5 billion years ago (0.2 z 1.2). Combining optical and near-infrared data, the team will estimate how the rate of star formation and the stellar masses of galaxies changed over this period, which covers almost half of cosmic history. They will measure how closely the objects cluster on the sky, and investigate the relation between a galaxy's nuclear activity and its rate of starbirth by comparing galaxies with active nuclei to those without. Statistics of close galaxy pairs will test models for the rate at which nearby galaxies merge with each other. Three graduate students will be trained through their involvement in the research. The team will release their data and catalogs to the community. Dr Blanton and Dr Eisenstein have an excellent track record in releasing large catalogs of data in a form useful to other workers, such as the 'value-added' catalogs for the Sloan Digital Sky Survey.

该奖项由2009年美国复苏和再投资法案(公共法律111-5)资助。科尔博士、布兰顿博士和艾森斯坦博士将分析他们对30万个星系的大规模调查，以了解在当前标准冷暗物质模型的背景下，过去数十亿年来星系星体的增长和演化。该团队使用6.5米长的麦哲伦望远镜的棱镜光谱测量了11平方度的区域。他们确定了星系的红移z，从而确定了距离，这些星系被认为是在2.5到85亿年前(0.2 z 1.2)之间。结合光学和近红外数据，该团队将估计恒星形成速度和星系的恒星质量在这段时间内是如何变化的，这段时间几乎涵盖了宇宙历史的一半。他们将测量天体在天空中聚集的距离，并通过比较有活动核的星系和没有活动核的星系来研究星系核活动与恒星诞生速度之间的关系。近距离星系对的统计数据将测试附近星系相互融合的速度的模型。将通过参与研究对三名研究生进行培训。该团队将向社区发布他们的数据和目录。布兰顿博士和艾森斯坦博士在以对其他工作人员有用的形式发布大型数据星表方面有着出色的记录，例如斯隆数字天空调查的增值星表。