Cosmic Ray Feedback in a Multi-Phase Medium

随着宇宙时间的推移，星系通过获取气体并将其转变为恒星来增长。星系生长的模型需要处理恒星形成和演化对气体冷却并形成更多恒星的速度的影响，这一过程被称为“反馈”。该项目将开发更好的模型，研究被称为宇宙射线的高能粒子在反馈中所起的作用。然后，这些模型将被提供给天体物理学家，以更好地模拟星系的增长。拟议的项目将开发宇宙射线如何与环星系介质中的冷热气体相互作用的小规模物理模型。他们将研究一些涉及宇宙射线的相互作用，包括湍流、热不稳定性和云雾卷吸。这个奖项反映了NSF的法定使命，通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为是值得支持的。

Over cosmic time, galaxies grow by acquiring gas and turning it into stars. Models of the growth of galaxies need to deal with the influence of star formation and evolution on the rate at which gas is then cooled and turned into more stars, in a process known as 'feedback'. This project will develop better models on the role that high-energy particles known as cosmic rays play in feedback. These models will then be made available to astrophysicists to better model galaxy growth.The proposed project will develop 'small-scale physics' models of how cosmic rays interact with cold and warm gas in the circumgalactic medium. They will look at a number of interactions involving cosmic rays, including turbulence, thermal instabilities, and cloud entrainment. This physics will then be incorporated in MHD codes for modeling feedback in galaxies.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.