Research interests

Galaxy-Halo Connection

What is galaxy-halo connection?

Galaxies are born and raised in dark matter halos, so, theoretically, their properties should be tightly correlated. Thus, it is critical to infer the relation between their properties from observation, and explain it with physical model.

What do I want to know?
  • How are the galaxy properties correlated with halo properties statistically?
  • What are the physical origins of these correlations?
  • How can we verify the answers to the above two questions?

Galaxy connection across cosmic time

Why do we want to connect galaxies across cosmic time?

Due to the limited light speed, the more distant we see, the younger Universe we get. However, observed galaxies at different cosmic time do not have causal relation. Consequently, we can only infer the statistical evolution of galaxies, and models or assumptions must be adopted. With this connection in hand, we can directly infer the galaxy evolution process.

What do I want to know?
  • How to connect galaxies across different redshifts?
  • How to verify the connecting method?
  • What can we learn from the connected galaxies?

Statistics in astronomy

Why do I value statistics in astronomy?

Unlike experimental physics, we cannot directly observe the evolution of astronomical objects, or manipulate them. Thus, the only way to infer the underlying physics is analysing the data using statistical tools.

What do I want to learn?
  • How to infer the statistical correlation among several variables robustly?
  • How to perform the statistical inference numerically fast?
  • How to infer the causal relation from statistical correlation?


Finding proto-clusters to trace galaxy evolution

Galaxy Group at high-redshift in incomplete spectroscopic surveys