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Dark matter halo is a key concept in modern cosmology and galaxy formation. The classical definition of a halo restricts our attentions to its relatively inner part that is approximately viralized, while many recent works start to explore alternative definitions of the halo boundary which push the domain of a halo much further out. Combining these different scales, a dark matter halo is intrinsically a multi-layer structure.
In this talk, I will introduce our efforts in understanding and measuring the different layers of a dark matter halo. Starting from the Milky Way (MW) halo, I will show that there is an “uncertainty principle” in the dynamical measurement of its virial mass, and explain how we manage to reduce this uncertainty and measure the MW mass precisely. Beyond the virialized region, I will introduce a new halo boundary called depletion radius which we proposed recently, and progresses on its measurement in our MW and galaxy groups.
Jiaxin Han got his PhD from Shanghai Astronomical Observatory in 2013 and subsequently worked as postdocs at the Institute for Computational Cosmology (Durham University, UK) and the Kavli Institute for the Physics and Mathematics of the Universe (IPMU, Tokyo University), before joining Shanghai Jiao Tong University in 2018 as a faculty member. His research focuses on studying the property and distribution of dark matter through various astrophysical approaches. He has been supported by the Marie-Curie foundation (EU), JSPS (Japan) and the national talent recruitment program.