Modeling Galaxies in the Modern Era: A Synergy between Theory and Observations

现代星系建模：理论与观测的协同作用

• 批准号: 1715206
• 负责人: Desika Narayanan
• 金额: $ 31.1万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1715206&HistoricalAwards=false
• 关键词: Modeling; Galaxies; Modern; Era; Synergy

Charting the formation and growth of galaxies, such as our own Milky Way, is a fundamental goal of modern astrophysics. The investigator studies galaxies forming their stars and changes in the appearance of galaxies with time. The investigator will study how the elements seen in galaxies change as stars form, then later explode. Answering these questions requires a technique called Spectral Energy Distribution (SED) fitting, where astronomers model the light coming from a galaxy, then infer its physical properties. However, associated with the fitting technique are potential errors that could result in a misunderstanding of the physical properties of galaxies. The investigator will model potential errors and therefore derive a more accurate view of galaxies in the distant Universe. The investigators will improve on their theoretical models for galaxies by running large-scale computer simulations of galaxies forming and changing. These simulations use many millions of computer hours. They will model galaxy changes with time, starting from soon after the Big Bang until present times.The investigator will also work with high school teachers visiting in the campus in the summer to train them in the software and background material that will accompany the lesson plans. The lesson modules will leverage the capabilities of both the World-Wide Telescope and the Galaxy Zoo projects. The investigator will transform the cosmological simulations into fly-through interactive movies to show the public the beauty of these fascinating simulations.The investigator's goal for this project is testing SED fitting techniques. They will employ a series of cosmological galaxy formation simulations in which individual galaxies change with from early Universe to the present time. They will select the galaxies to zoom in on from state-of-the-art cosmological hydrodynamic simulations and run models ranging from Milky Way mass through the progenitors of the most massive clusters at present epoch. The investigators will next use their detailed simulations and compute what the astronomers would see, given the telescope characteristics. Because astronomers use programs to deduce the physical properties from observations, the investigator can compare the galaxy simulation with the values deduced from the simulated observations. This will test the accuracy of observational results, and the comparison will be used to devise better ways of making astronomical measurements. Their main goals are to improve models of star formation rate, stellar mass, and metallicity estimates.

绘制星系的形成和成长的图表，比如我们的银河系，是现代天体物理学的一个基本目标。 研究人员研究星系形成恒星以及星系外观随时间的变化。 研究人员将研究星系中的元素如何随着恒星的形成而变化，然后爆炸。 解决这些问题需要一种称为光谱能量分布（SED）拟合的技术，天文学家可以对来自星系的光进行建模，然后推断其物理性质。 然而，与拟合技术相关的是潜在的错误，可能导致对星系物理特性的误解。 研究人员将模拟潜在的误差，从而获得遥远宇宙中星系的更准确视图。 研究人员将通过运行星系形成和变化的大规模计算机模拟来改进他们的星系理论模型。 这些模拟使用了数百万个计算机小时。 他们将模拟银河系随时间的变化，从大爆炸后不久到现在。调查人员还将与夏季访问校园的高中教师合作，对他们进行软件和背景材料方面的培训，这些材料将与课程计划一起提供。 课程模块将利用万维望远镜和银河动物园项目的能力。 研究人员将把宇宙学模拟转换成飞行通过互动电影，向公众展示这些迷人的模拟之美。研究人员对这个项目的目标是测试SED拟合技术。 他们将采用一系列宇宙学星系形成模拟，其中单个星系从早期宇宙到现在的变化。 他们将从最先进的宇宙学流体动力学模拟中选择要放大的星系，并运行从银河系质量到目前最大质量星系团的祖先的模型。 接下来，研究人员将使用他们的详细模拟，并根据望远镜的特性计算天文学家将看到什么。 由于天文学家使用程序从观测中推导出物理性质，因此研究人员可以将星系模拟与从模拟观测中推导出的值进行比较。 这将测试观测结果的准确性，并将使用比较来设计更好的天文测量方法。 他们的主要目标是改进星星形成率、恒星质量和金属丰度估计的模型。

项目成果

A Theory for the Variation of Dust Attenuation Laws in Galaxies

• DOI: 10.3847/1538-4357/aaed25
• 发表时间: 2018-05
• 期刊: The Astrophysical Journal
• 作者: D. Narayanan;C. Conroy;R. Davé;Benjamin D. Johnson;G. Popping

How Well Can We Measure the Stellar Mass of a Galaxy: The Impact of the Assumed Star Formation History Model in SED Fitting

• DOI: 10.3847/1538-4357/abbfa7
• 发表时间: 2020-06
• 期刊: The Astrophysical Journal
• 作者: S. Lower;D. Narayanan;J. Leja;Benjamin D. Johnson;C. Conroy;R. Dav'e

Recovering the Physical Properties of Molecular Gas in Galaxies from CO SLED Modeling

• DOI: 10.3847/1538-4357/aab3e2
• 发表时间: 2018-03
• 期刊: The Astrophysical Journal
• 作者: J. Kamenetzky;G. Privon;D. Narayanan

simba: Cosmological simulations with black hole growth and feedback

• DOI: 10.1093/mnras/stz937
• 发表时间: 2019-01
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: R. Dav'e;D. Anglés-Alcázar;D. Narayanan;Qi Li;M. Rafieferantsoa;S. Appleby

A massive core for a cluster of galaxies at a redshift of 4.3

• DOI: 10.1038/s41586-018-0025-2
• 发表时间: 2018-04
• 期刊: Nature
• 影响因子: 64.8
• 作者: T. Miller;T. Miller;S. Chapman;S. Chapman;S. Chapman;M. Aravena;M. Ashby;C. Hayward;J. Vieira;A. Weiss;A. Babul;M. Béthermin;C. Bradford;M. Brodwin;J. Carlstrom;Chian-Chou Chen;D. Cunningham;D. Cunningham;C. Breuck;Anthony H. Gonzalez;T. Greve;J. Harnett;Y. Hezaveh;K. Lacaille;K. Lacaille;K. Litke;Jingzhe Ma;M. Malkan;D. Marrone;W. Morningstar;E. Murphy;D. Narayanan;E. Pass;E. Pass;R. Perry;K. Phadke;D. Rennehan;K. Rotermund;J. Simpson;J. Simpson;J. Spilker;J. Sreevani;A. Stark;M. Strandet;A. Strom