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The Impact of Baryon Physics on the Structure of high-redshift Galaxies
主讲人 主持人
时间 2012/04/28 报告题目
首作者 People
职称 联系电话
邮箱 研究方向
主讲人简介 地点
办公室 研究院
日期: 
2012/04/28
People: 
Marcel Zemp 教授(北京大学)

摘要:I present a study of the detailed structure of galaxies at redshifts z > 2 using cosmological simulations with improved modeling of the interstellar medium and star formation. The simulations follow the formation and dissociation of molecular hydrogen and include star formation only in cold molecular gas. The molecular gas is more concentrated toward the center of galaxies than the atomic gas, and as a consequence, the resulting stellar distribution is very compact. Relative to the non-radiative run, the inner regions of the dark matter halo change shape from prolate to mildly oblate and align with the stellar disk. The outer halo regions retain the orientation acquired during accretion and mergers and are significantly misaligned with the inner regions. The radial profile of the dark matter halo contracts in response to baryon dissipation, establishing an approximately isothermal profile throughout most of the halo.