Collaborative Research: CDS&E: FIRE: Physically-Predictive Cosmological Simulations of Galaxy Formation with Resolved Feedback

合作研究：CDS

• 批准号: 1411920
• 负责人: Philip Hopkins
• 金额: $ 32.53万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1411920&HistoricalAwards=false
• 关键词: Collaborative; Research; CDS& FIRE; Physically

The "Feedback in Realistic Environments" (FIRE) project introduces exciting new ways to account for the effects of the earliest generation of stars, formed when the Universe is young, on the formation of galaxies and clusters of galaxies, the large-scale tracers of cosmology, the science of the origin and evolution of the Universe. The FIRE computer models will include more of the important physics than has ever been done before, and early tests suggest this work agrees with observations more cleanly than previous studies, which had to include various arbitrary assumptions in order to make progress. The technical details within FIRE will also disentangle problems due to the uncertain physics of galaxy formation from problems caused solely by the limitations of computer modeling.FIRE will carry out novel computational studies of galaxy formation using high-resolution cosmological simulations that resolve the interstellar medium (ISM) with unprecedented realism. Star formation injects large quantities of energy and momentum into the surrounding medium, and this stellar feedback generates galactic winds that affect the galactic environment. This project will run the first cosmological simulations that self-consistently include important stellar feedback physics. Combining a resolved, multiphase ISM with highly non-linear feedback interactions produces powerful galactic winds in broad agreement with observations, without using any of the ad hoc prescriptions which previous simulations have had to invoke. FIRE simulations will address the regulation of galaxy growth by stellar feedback, the properties of galactic inflows and outflows, the morphological transformation of galaxies, quenching of star formation in massive galaxies, active galactic nucleus feedback, the escape fraction of ionizing photons, and stellar feedback on dark matter halos. All of these simulations will be connected directly with multi-wavelength observations. In particular, simulated absorption line statistics compared with high-redshift measurements will test predictions of gas flows in and out of galaxies. Technical enhancements incorporated into FIRE will help to quantify the relative importance of numerical and physical uncertainties in galaxy formation modeling. The initial conditions of all FIRE simulations will be made available to the community to motivate others to follow this approach.The project includes training of four graduate students, who will also learn from the collaborative interactions across three institutions. Visualizations from FIRE form a basis for outreach targeted at high school students, including workshops in computational thinking for teachers. Other efforts include seminars aimed at teachers, local astronomy enthusiasts, and students from underrepresented groups, working to explain the connection between local phenomena on Earth and the cosmic processes studied by FIRE.

“现实环境中的反馈”（火灾）项目引入了令人兴奋的新方法，以说明宇宙年轻时形成的最早的恒星的影响，对星系和星系的形成，宇宙学的大规模示踪剂，宇宙的科学和宇宙的科学。 消防计算机模型将包含比以往任何时候都多的重要物理学，并且早期测试表明，这项工作比以前的研究更加干净地观察，这些研究必须包括各种任意假设才能取得进展。 火灾中的技术细节还将消除问题的问题，这是由于Galaxy形成的不确定物理学与仅由计算机建模的局限性引起的问题。Fire将使用高分辨率宇宙学模拟对银河系形成进行新的计算研究，这些宇宙学模拟能够解决以前的现实主义的星际介质（ISM）。 恒星形成将大量能量和动量注入周围的介质中，而这种出色的反馈产生了影响银河环境的银河风。 该项目将开展第一个自以为是的宇宙学模拟，其中包括重要的恒星反馈物理学。 将解决的多相ISM与高度非线性反馈相互作用相结合，可以与观测值一致，而无需使用以前模拟必须调用的任何临时处方。 火灾模拟将通过恒星反馈，银河流入和流出的特性，星系的形态转化，大量星系中的恒星形成，主动的银河核反馈，电离光光子的逃生分数以及对暗物质卤素的出色反馈。 所有这些模拟将直接与多波长观测值连接。 特别是，与高红移测量值相比，模拟的吸收线统计数据将测试星系内和外气流的预测。 纳入火灾的技术增强功能将有助于量化银河形成模型中数值和物理不确定性的相对重要性。 所有火灾模拟的最初条件将提供给社区，以激励他人遵循这种方法。该项目包括对四名研究生的培训，他们还将从三个机构的协作互动中学习。 Fire的可视化构成了针对高中生的外展的基础，包括教师计算思维的研讨会。 其他努力包括针对教师，当地天文学爱好者和来自代表性不足团体的学生的研讨会，旨在解释地球上当地现象与火灾研究的宇宙过程之间的联系。