SHAO Astrophysics Colloquia

Title : Low Surface Brightness Galaxies - their morphological classes and disk evolution
Speaker: Prof. Mousumi Das (Indian Institute of Astrophysics)

Time: 3pm, September 7 (Thursday)

Location: Lecture Hall, 3rd floor

Abstract:

Low surface brightness (LSB) galaxies are gas rich, low luminosity disk galaxies that

are characterised by their large dark matter masses and low density stellar disks. They

are the one of the best laboratories to study the effect of halo mass on disk evolution in

our nearby universe. In this talk i will discuss the different subclasses of LSB galaxies

- spirals, dwarfs, irregulars and what it tells us about their origin. I will also present

observations and simulations of bars in LSB galaxies, to show how how disk surface

density affects the evolution in these galaxies.

Seminar talk

Title: Semi-analytic model: galaxy formation and evolution

Speaker: Dr. Lizhi Xie (Astronomical Observatory of Trieste - INAF, Italy)

Time: 3 PM, September 6 (Wednesday)

Location: Middle conference room, 3rd floor

Abstract:

The semi-analytic model has been proved to be a particularly useful tool in understanding observed phenomenons and testing hypothetical theories. In this talk, I will present an up-to-date semi-analytic model, GAEA (arXiv: 1611.09372), which is featured with a detail chemical enrichment scheme, a 'realistic' Supernovae feedback model based on hydro-simulations, and H2-based star formation laws. Firstly, I will introduce the assembly history of galaxies' host haloes. Then I will go through the sub-grid physics of constructing galaxies in dark matter haloes, especially the star formation law. In the end, I will show several case studies of using semi-analytic models to study the evolution of galaxies.

Visitors

Name: Dr. Lizhi Xie

Affiliation: Astronomical Observatory of Trieste - INAF

Dates: 5th-9th September

Host: Hong Guo

Office: 1709