How Is Cold Gas and Star Formation Affected by Disc Galaxy Stellar Structures?
盘星系的恒星结构如何影响冷气体与恒星形成？
In the local Universe, the existing galactic stellar structures (bulge, bar, spiral arms) may play a role in affecting the disc cold gas distribution and properties, thus the star formation (SF) activity therein. Various physical mechanisms have been proposed to be at play, which include shear, streaming motion, gas compression and shocks associated with the disc non-axisymmetric structures, to name a few. As a result, mixed results regarding connection between cold gas and SF, and stellar structures properties and dynamics, have emerged from recent observations. Combining physically motivated characterisation of (non-)axisymmetric structures and observations of cold gas and SF provides us opportunities to study the interweaved, intricate mechanisms in behind. In this talk, I would like to give a brief review of how recent observations contribute to unravel the connection between stellar structures, disc cold gas distribution, SF, and the corresponding efficiency. Then, I will talk about our work in characterising the stellar structures through torque forces, and how this method might be extended to investigate the intricate physical mechanisms at play in behind.
