Halo mass-observable proxy scaling relations and their dependencies on galaxy and group properties

ABSTRACT

In the standard ΛCDM paradigm, galaxies form and evolve in the potential wells of dark matter halos. Understanding the evolution of galaxies in dark matter halos (groups) and the related physics is one of the greatest challenges of modern cosmogony. In this talk, I will present my recent work based on the weak lensing method. We study the scaling relations between halo mass(Mh) and various halo mass proxies for SDSS central galaxies, and we find a complex dependence of these relations on galaxy and group properties, indicating different evolutionary processes. I will also introduce a method for constructing new halo mass proxies and evaluating their performance. In addition, I will present the Mh-supermassive black hole(SMBH) mass relation we obtained and discuss the indications for rapid and linear growth phases for SMBH.


Speaker: 
Ziwen Zhang, University of Science and Technology of China (USTC)
Place: 
REMOTE meeting The zoom link is as follows: Zoom Meeting ID: 878 6573 2980, Passcode: astroPKU, Link: https://us02web.zoom.us/j/87865732980?pwd=VmNqQkxXM21WVzBibnA1TmNxa0Radz09
Time: 
Tuesday, May 23, 2023 - 1:30PM to Tuesday, May 23, 2023 - 2:15PM
Link: 
https://us02web.zoom.us/j/87865732980?pwd=VmNqQkxXM21WVzBibnA1TmNxa0Radz09
Biography: 
Ziwen Zhang is a PhD student at University of Science and Technology of China, where he is supervised by Prof. Huiyuan Wang. He is currently at CEA-Paris Saclay as a visiting PhD student to study weak lensing techniques. His research interests focus on the co-evolution of galaxies and halos, the triggering scenario of AGN, and the weak lensing techniques.