Toward an Accurate Model for the Gas Around Galaxies

建立星系周围气体的精确模型

• 批准号: 1911233
• 负责人: Philip Hopkins
• 金额: $ 18.57万
• 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: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1911233&HistoricalAwards=false
• 关键词: Toward; Accurate; Model; Gas; Around

Observations of nearby galaxies show that these galaxies are still growing, as gas clouds surrounding them fall into these galaxies. So far, models of how galaxies grow, and stars form, do not fully explain the observations. The investigators will more finely model the physical properties of the infalling gas. The investigators have strongly argued that better numerical models will explain the discrepancies.The circumgalactic medium (CGM), the low-density gas surrounding galaxies, is increasingly recognized for its crucial role in the complicated process of forming new generations of stars in galaxies. Observations of the CGM indicate large quantities gas are present around galaxies. However, theorists cannot explain why that gas exists in such large abundances, because current computer models severely underpredict it. Recent discoveries indicate that traditional simulations fail to resolve small cool gas clouds, potentially explaining the mismatch between theory and observation. The investigators are now running state-of-the-art simulations which track the cool gas component explicitly. In this study, they will make novel comparisons between our simulations and many observations of the CGM. The investigators will use the observations to deduce how accurate their models are at explaining the elusive behavior of the CGM and its effects on galaxy growth.Traditionally, public education efforts held in scientific institutions bias target audiences towards people already excited about science, while ignoring much of the rest of the community. The investigator's team organizes public education activities in non-traditional venues like parks, pedestrian streets, public transportation, bars, etc. to truly reach a wide cross-section of our society, including underrepresented groups in STEM. The investigators will extend existing outreach efforts by designing and building an "AstroViz" kit, capable of projecting state-of-the-art computational simulations at these non-traditional public education events. These projections will employ the advanced visualizations that enable the public to quickly grasp concepts not easily conveyed through words alone. Applied to a nearby sidewalk or storefront, the investigators projected visualizations will better draw the attention of the public.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

对附近星系的观察结果表明，这些星系仍在增长，因为它们周围的气云落入这些星系中。 到目前为止，星系生长的模型和恒星形成，尚未完全解释观察结果。 研究人员将更精细地对插入气体的物理特性进行建模。 研究人员强烈认为，更好的数值模型将解释差异。海角培养基（CGM）（CGM）是周围星系周围的低密度气体，由于其在形成星系中新一代恒星的复杂过程中的关键作用而越来越认可。 CGM的观察表明，星系周围存在大量气体。但是，理论家无法解释为什么气体在如此大的丰度中存在，因为当前的计算机模型严重低估了。 最近的发现表明，传统的模拟无法解决小的凉气云，这可能解释了理论与观察之间的不匹配。 研究人员现在正在运行最新的模拟，这些模拟明确跟踪凉爽的气体组件。在这项研究中，他们将在我们的模拟与CGM的许多观察结果之间进行新的比较。研究人员将使用观察结果来推断其模型在解释CGM及其对星系增长的影响方面的难以捉摸的行为的准确性。在传统上，科学机构的公共教育工作使目标受众偏向于已经对科学感到兴奋的人们，同时忽略了许多社区的许多其他人。调查人员的团队在公园，行人街，公共交通，酒吧等的非传统场所组织公共教育活动，以真正达到我们社会的广泛横截面，包括STEM中代表性不足的团体。 调查人员将通过设计和构建“ Astroviz”套件来扩展现有的外展工作，该套件能够在这些非传统公共教育活动中预测最先进的计算模拟。 这些预测将采用先进的可视化，使公众能够迅速掌握单独单独传达的概念。 调查人员预测可视化将适用于附近的人行道或店面，将更好地引起公众的关注。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响评估审查标准，认为值得通过评估值得支持。

项目成果

Synchrotron emission on FIRE: equipartition estimators of magnetic fields in simulated galaxies with spectrally resolved cosmic rays

FIRE 上的同步加速器发射：具有光谱分辨宇宙射线的模拟星系中磁场的均分估计器

• DOI: 10.1093/mnras/stad3978
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Ponnada, Sam B.;Panopoulou, Georgia V.;Butsky, Iryna S.;Hopkins, Philip F.;Skalidis, Raphael;Hummels, Cameron;Quataert, Eliot;Kereš, Dušan;Faucher-Giguère, Claude-André;Su, Kung-Yi
• 通讯作者: Su, Kung-Yi

A simple sub-grid model for cosmic ray effects on galactic scales

银河尺度上宇宙射线效应的简单子网格模型

• DOI: 10.1093/mnras/stad976
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Hopkins, Philip F.;Butsky, Iryna S.;Ji, Suoqing;Kereš, Dušan
• 通讯作者: Kereš, Dušan

The AGORA High-resolution Galaxy Simulations Comparison Project. III. Cosmological Zoom-in Simulation of a Milky Way–mass Halo

• DOI: 10.3847/1538-4357/ac088a
• 发表时间: 2021-06
• 期刊: The Astrophysical Journal
• 作者: S. Roca-Fàbrega;Ji-hoon Kim;L. Hausammann;K. Nagamine;A. Lupi;Johnny W. Powell;I. Shimizu;D. Ceverino;J. Primack;Thomas R. Quinn;Y. Revaz;Héctor Velázquez;Tom Abel;M. Buehlmann;A. Dekel;Bili Dong;O. Hahn;C. Hummels;Ki-won Kim;Britton D. Smith;C. Strawn;R. Teyssier;M. Turk

Magnetic fields on FIRE: Comparing B-fields in the multiphase ISM and CGM of simulated L* galaxies to observations

FIRE 上的磁场：将模拟 L* 星系的多相 ISM 和 CGM 中的 B 场与观测结果进行比较

• DOI: 10.1093/mnras/stac2448
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Ponnada, Sam B.;Panopoulou, Georgia V.;Butsky, Iryna S.;Hopkins, Philip F.;Loebman, Sarah R.;Hummels, Cameron;Ji, Suoqing;Wetzel, Andrew;Faucher-Giguère, Claude-André;Hayward, Christopher C.
• 通讯作者: Hayward, Christopher C.

Probing Hot Gas Components of the Circumgalactic Medium in Cosmological Simulations with the Thermal Sunyaev–Zel’dovich Effect

• DOI: 10.3847/1538-4357/ac4750
• 发表时间: 2021-10
• 期刊: The Astrophysical Journal
• 作者: Junhan Kim;S. Golwala;J. Bartlett;S. Amodeo;N. Battaglia;A. Benson;J. Hill;P. Hopkins;C. Hummels;E. Moser;Matthew E. Orr