Modeling stellar feedback in galaxy formation simulations: where do we stand?

Colloquium

Astronomy Colloquium (2017 Fall Semester)

* Date: Dec 07
* Speaker: Taysun Kimm (Yonsei University)
* Title: Modeling stellar feedback in galaxy formation simulations: where do we stand?
* Abstract

Reproducing the low global star formation efficiency is a key challenge in galaxy formation theory. Previous cosmological simulations circumvented this issue by incorporating a phenomenological feedback model that is designed to drive strong outflows. However, we are now entering a new era in which the interplay between stellar feedback and the gas collapse in an ISM can be modeled in more detail without resorting to the phenomenological prescriptions. Recently, some cosmological zoom-in simulations of galaxy formation argue that observed galactic properties can be reproduced by their strong radiation feedback in conjunction with a dedicated star formation recipe, but it is still under debate what type of mechanism is primarily responsible for the suppression of star formation in galaxies. In this talk, I will discuss our recent developments in stellar feedback models in galaxy formation simulations, focusing on supernova explosions and radiation feedback. In particular, I will introduce a new feedback mechanism due to resonantly scattered Lyman alpha photons, and show that it can play a significant role at regulating star formation in metal-poor galaxies at high redshift. The talk will also discuss whether or not locally strong radiation pressure can boost gaseous outflow rates in small galaxies.

Date	Speaker	Title	Remarks
Sep 07	Ji-Yeon Seok (NAOC China)	PAH emission in protoplanetary disks
Sep 14	Jeongwoo Lee (Astronomy program, SNU)	The Total Solar Eclipse in 2017
Sep 21	Sang Gak Lee (College of Natural Sciences, SNU)	Spectroscopic Observation with NYSC 1 m Telescope
Sep 28	David Parkinson (KASI)	Tests of fifth forces using large-scale structure
Oct 05/Oct 12		[Chuseok]/[KAS Fall Meeting]
Oct 17	Tali Palma (UAB Santiago, Chile)	VVV Survey and Milky Way Globular Clusters	Tuesday
Oct 19	Nai-Hwa Chen (KASI)	Energetic particles at the Sun
Oct 26	Roberto Decarli (INAF, Italy)	The interstellar medium at high redshift
Nov 02	Christophe Pichon (IAP, France)	Connecting Large Scale Structures to Galaxy morphology
Nov 09	Northrup Grumman Korea	James Webb Space Telescope Roadshow
Nov 16	Hyunseok Jung (SNU Physics Department)	From Schrödinger’s Cat to Quantum Information Technology
Nov 23	Seon-Hee Seo (SNU Physics Department)	Neutrinos Oscillations: Past, Present and Future
Nov 30	Nobuo Arimoto (NAOJ / SNU)	A Hyper Suprime-Cam View of the Interacting Galaxies of the M81 Group – Structures and Stellar Populations
Dec 07	Taysun Kimm (Yonsei University)	Modeling stellar feedback in galaxy formation simulations: where do we stand?
Jan 10	Paul Yun (NASA Ambassador)	NASA Planetary Science Division Vision 2050	wednesday

2017 Fall semester detail