Title: Coupling between galaxies and haloes on small scales

Speaker: 施勇

Institute: 南京大学 天文与空间科学学院

Host: 高煜

Time: 14:30-16:30, Thursday

Location: Physics Building 552

Abstract:

As the main ingredient of the matter in the universe, dark matter is coupled with baryons through gravity. On large scales, such coupling has been nicely interpreted in the framework of lambdaCDM. However, there is a variety of differences between observations and predictions on small scales. To reconcile these differences, different approaches have been proposed, e.g. including the baryonic feedback and a more radical one by modifying the nature of dark matter. In this talk, I will illustrate some challenges on this topic by presenting two works, including a cuspy dark matter halo discovered through observations of an ultra diffuse galaxy and a universal relation between galaxy stellar masses and halo binding energies.

Bio:

施勇，南京大学天文与空间科学学院教授、博士生导师。2003年本科毕业于北京大学地球物理系，2008 年8 月于美国亚利桑那大学天文系获得天文博士学位，2008 年8 月至2009 年8 月在亚利桑那大学继续博士后工作一年， 2009 年9 月至2013 年2月在美国加州理工学院从事博士后研究，2013 年3月入职南京大学。于2018年获得国家杰出青年科学基金，2019年获腾讯“科学探索奖”。目前担任日本《PASJ》天文杂志以及中国《Innovation》综合杂志的编委。

Ref:

Shi et al. ApJ 909, 20 (2021), A Cuspy Dark Matter Halo. https://doi.org/10.3847/1538-4357/abd777