Feeding and Feedback: Understanding the Assembly of Galactic Disks

星系的成长是因为星系从周围聚集气体产生恒星。然后恒星会产生一种“风”，这种风是由星光和高能粒子沿着来自更大质量恒星爆炸的超新星驱动的。这种风的作用是将气体从星系中驱逐出去，从而减缓了星星的形成速度。该项目将研究气体进出形成星星的星系的流动，方法是观察来自遥远类星体的光在穿过更近的形成星星的星系周围的气体时是如何被吸收的。该项目还将把他们的结果与宇宙学模拟进行比较，以更好地理解模拟和星系的状态。该项目还将增加代表性不足的少数民族从小学到研究生的教育机会。随着星系的成长，它们从周围吸积气体，以供形成星星。当它们形成恒星时，它们会产生星系风，将气体赶走。这个项目将研究气体在形成星星的星系中的进出流动。通过观测沿着视线到遥远类星体的环星系气体的吸收线，将测量气体的流动。这将使我们更好地了解气体如何在星系生长过程中流入和流出星系。该项目将分析50个新的视线，对几个典型的星星形成星系周围的环星系介质（CGM）进行采样。然后，该项目将使用EAGLE模拟将这些结果与星系形成的宇宙学模拟进行比较。该项目还将执行一个？回顾研究？通过比较星系的红移约为0.2与它们的较低质量的祖先，红移为2。在这一部分中，该项目将研究星系团的遥远星系，并从统计学上确定这些星系团是否与不同的气体流出有关。该项目还将增加代表性不足的少数民族从小学到研究生的教育机会，该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来支持。

The growth of galaxies occurs as the galaxies gather gas from their surroundings to produce stars. The stars will then produce a 'wind' that is driven by starlight and energetic particles along with supernovae from the explosion of more massive stars. This wind serves to drive gas away from the galaxies which slows down the star formation rate. This project will study the flow of gas in and out of star forming galaxies by looking at how the light from distant quasars is absorbed as it passes through the gas surrounding the more nearby star forming galaxies. The project will also compare their results with cosmological simulations to better understand both the simulations and the status of the galaxies. The project will also enhance the educational opportunities for underrepresented minorities from elementary school to the graduate level.As galaxies grow, they accrete gas from their surroundings to feed their star formation. As they form stars, they produce a galactic wind that drives gas away. This project will study the flow of gas in and out of star forming galaxies. The flow of the gas will be measured by observing absorption lines from circum-galactic gas lying along the line-of-sight to distant quasars. This will give us a better understanding of how gas flows in and out of galaxies as they grow. The project will analyze 50 new sightlines, sampling the circum-galactic medium (CGM) around several typical star forming galaxies. The project will then compare these results with cosmological simulations of galaxy formation, using the EAGLE simulations. The project will also perform a ?Look Back Study? by comparing galaxies at redshifts of ~0.2 with their lower mass progenitors a redshifts of 2. In this part, the project will look at clumpy distant galaxies and statistically determine if the clumpiness can be related to different outflows of gas. The project will also enhance the educational opportunities for underrepresented minorities from elementary school to the graduate level.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.