ASIAA Summer Students Program
ASIAA Summer Student Program 2023
July 3 - August 31

2023 Project Description

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Are star formation in galaxies ceased through inside-out or outside-in quenching?
This project can be carried out remotely.



Lihwai Lin, Bau-Ching Hsieh, Hung-Yu Jian, Carlos Lopez Coba
Find out more about supervisors on ASIAA website

Task Description and Goals

Galaxies exhibit diverse properties in their morphology, star formation actity, and stellar populations. In many aspects the distribution is bimodal--galaxies with early-type morphology (e.g., ellipticals) tend to be older and have less star formation while late-type galaxies (e.g., spirals) are more active in forming stars and in general younger. The physical mechanisms driving the distinct properties of galaxies remain one of the most important topics to be explored.

In this project, we will use the SUBARU HyperSuprimeCam (HSC) Survey and SDSS-IV/MaNGA to study the spatial distribution of stellar populations of galaxies. We will categorize the galaxies into inside-out vs. outside-in quenching modes based on the non-parametric method that we develop (Lin et al. 2019), and study the frequency of different quenching modes as a function of various global galaxy properties. This porject will shed light on how galaxies are transformed from the star-forming to the quiescent phases.

Required Background

Having basic experience in Linux/Unix systems and programming (e.g., Python, IDL, Fortran, C++, etc) is desirable. Comfortable with communication and giving a presentation in English. Basic knowledge of astrophysics or physics is preferred.

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