1、Title: Reproduce the star formation history of galaxies from simulations

　　Speaker: 汪洋（Peng Cheng Laboratory）

　　Abstract: Star formation history (SFH) is important in a galaxy’s formation and evolution. It affects the shape, mass, metallicity, color, and many other properties of a galaxy. And it also encodes the physics which drives the galaxy evolution. Retrieving the SFH of galaxies is always a critical issue in the research of galaxy formation. This is a tough task due to the complexities and uncertainties in the formation of galaxy. Benefitted by the arisen of hydro-dynamic cosmological simulation, we can investigate the simulated galaxies without strong prior assumptions on SFH. This provides researchers a powerful tool for investigation on SFH. I would like to show my recent works investigating the SFH in simulations, which may bring light to task of recovering the SFH of observed galaxies.

　　Time：14:00pm on March.7(Tuesday)

　　Place：5-516 in PMO

　　2、Title: Nailing down the evolution of the IGM in the post-reionization era through high-resolution simulations

　　Speaker: Paulo Montero（Pengcheng Laboratory）

　　Abstract: Cosmic reionization corresponds to the milestone of the Universe where the intergalactic medium transitions from primarily neutral, dark, and cold into mainly ionized, more luminous, and warmer. During this transition, the intergalactic medium is violently heated and ripples from the additional injected energy can be seen millions of years after this milestone. However, estimates of these ripples tend to focus on large scales (a choice that was partially motivated by computational resources). In this talk, I will describe the thermodynamic and hydrodynamic response of the often forgotten intergalactic medium small-scale structure to the reionization process. Furthermore, I will showcase how this response leads to observational “fossils” that can be observed in both current Lyman-alpha forest surveys (e.g. DESI) and nearfuture 21 cm line intensity mapping experiments (e.g. SKA/PUMA). Likewise, I will highlight the physical gains of this effect as a window into the physics that govern cosmic reionization and the Cosmic dawn, and ultimately as a competitive probe of the nature of dark matter.

　　Time：15:30pm on March.7(Tuesday)

　　Place：5-516 in PMO

欢迎大家参加！