Lunch talk on Jan. 4, 2021

The major mechanism to drive turbulence in star-forming galaxies

Speaker: Xiaoling Yu（Nanjing University）

Venue: Video conference

Time: 12:30 PM, Monday, Jan. 4, 2021

Abstract: 

Two competing models, gravitational instability-driven transport and stellar feedback, have been proposed to interpret the high velocity dispersions observed in high-redshift galaxies. We analyze the intrinsic velocity dispersion properties of 648 star-forming galaxies observed by the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, to explore the relation of intrinsic gas velocity dispersions with star formation rates (SFRs), SFR surface densities, stellar masses and stellar mass surface densities. By comparing our results with predictions of theoretical models, we found that the energy feedback from star formation processes alone and the gravitational instability alone can not fully explain simultaneously the observed velocity-dispersion/SFR and velocity- dispersion/SFR surface densities relationships. In order to provide the strongest constrain on the physical origin of velocity dispersion in star-forming galaxies, we proposed high spectral resolution IFU observations, so that Wide Field Spectrograph (WiFeS) integral  eld spectroscopic (IFS) observations, so that measure the model input parameters and have some interesting results.

Report PPT:  SWIFAR_Xiaoling Yu.pdf