Collaborative Research: Changes in Molecular Gas and Galaxy Properties Over Time in the Era of Integral Field Unit Surveys

合作研究：整体野外单元巡天时代分子气体和星系特性随时间的变化

• 批准号: 1616199
• 负责人: Tony Wong
• 金额: $ 26.77万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2021-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1616199&HistoricalAwards=false
• 关键词: Collaborative; Research; Changes; Molecular; Gas

Part 1Changes of a galaxy's properties over time are driven by the quantity of its cold gas, the raw material from which stars form. Thus, understanding the properties of a galaxy's cold gas component will tell us both how the star formation process changes over time and how this affects galaxies. Using a recently completed survey of carbon monoxide gas in a sample of nearby galaxies, the proposers will (1) measure how the molecular gas is used up, in order to test how star formation in the galaxies is affected; (2) map the locations of this gas in the galaxies to determine if/how these locations affect star formation; and (3) measure how the gas is flowing into and out of the galaxies to determine how this affects structural changes in the galaxies over time. In particular, some questions that can be answered from this research include: What factors affect the conversion of molecular gas into stars? How is molecular gas structured? How do galaxies grow and age? This proposal will provide insight into the process of galaxy formation and our understanding of these objects.Part 2This proposal plans to combine spatially resolved spectroscopy of carbon monoxide molecular gas, ionized gas and stellar populations for a sample of 125 nearby galaxies. Measuring spatially-resolved molecular gas depletion time scales as a function of various galaxy properties, using diagnostics of spectral lines to probe diffuse molecular gas, and constraining the rates of gas in- and outflow for these galaxies has the potential to add greatly to our understanding of star formation in normal galaxies.Observations of galaxies across a range of redshifts allow us to witness the growth and aging of the galaxy population. It has long been recognized that these processes are driven by the rise and fall of star formation, which is ultimately linked to the supply of cold gas. Further progress in understanding the regulation of star formation in galaxies, however, requires additional observational constraints beyond the molecular gas mass and star formation rate. By exploiting a unique combination of the largest, most homogeneous interferometric CO survey of galaxies to date (the Extragalactic Database for Galaxy Evolution, or EDGE) and one of the principal ongoing optical integral field unit (IFU) surveys (CALIFA), the project team will confront models of star formation and galaxy evolution with uniform, high quality measurements of gas masses and star formation rates, supplemented by a vast array of additional data, including star formation history, stellar mass, nuclear activity, and the metallicity and kinematics of the gas and stars. These studies will be conducted on a spatially resolved basis across a well-defined sample that is representative of the nearby Universe, and will thus inform future studies of star formation and mass assembly at all redshifts undertaken by JWST and ALMA.

随着时间的推移，银河系特性的第1部分是由其冷气的数量驱动的，其冷气，即恒星形成的原材料。 因此，了解星系的冷气成分的特性将告诉我们恒星形成过程如何随时间变化以及如何影响星系。提议者将使用最近完成的一氧化碳气体调查，提议者将（1）测量分子气体如何使用的方式，以测试星系中星系中的恒星形成如何影响； （2）绘制星系中这种气体的位置，以确定这些位置是否影响恒星形成； （3）测量气体如何流入和流出星系，以确定这如何影响星系的结构变化。 特别是，从这项研究中可以回答的一些问题包括：哪些因素会影响分子气体转化为恒星？分子气体结构如何？星系如何增长和年龄？ 该提案将提供有关星系形成过程和我们对这些对象的理解的见解。第2部分建议计划将一氧化碳分子气体，电离气体和恒星种群的空间分辨光谱结合起来，用于附近的125个星系。使用光谱线的诊断来探测分子气体的诊断，并约束这些星系的气体内和流出率，可以极大地添加到我们对正常星系的范围的范围，从而极大地增加了这些星系范围的潜力 人口。长期以来，人们已经认识到，这些过程是由恒星形成的兴衰驱动的，这最终与冷气的供应有关。然而，在了解星系中恒星形成的调节方面的进一步进展需要超出分子气体质量和恒星形成速率的其他观察性约束。通过利用迄今为止对星系的最大，最均匀的干涉率调查的独特组合（用于星系进化或边缘的外层面数据库）和主要持续的光学整体现场单位（IFU）的主要组合（CALIFA），该项目团队将逐步构建了量子和星系的质量，并构成了高质量的质量，并构成了良好的质量，并构成了良好的质量，并构成了良好的质量，并构成了良好的质量，并质量质量质量大量其他数据，包括恒星形成历史，恒星质量，核活动以及气体和恒星的金属性和运动学。这些研究将在代表附近宇宙的明确样本中以空间解析为基础进行，因此将为JWST和ALMA所承担的所有红移提供了未来对恒星形成和质量组装的研究。