恆星高生成原星系環境內大規模物質流與宇宙射線加熱


Seminar:- Large-Scale Outflows from Starforming Galaxies and Cosmic-Ray Heating in Protogalactic Environments

Galaxies with strong star-forming activity are found to have large-scale outflows. These outflows are multi-phase, multi-component media, consisting of a mixture of ionised and neutral gases, in the form of bubbles and clamps respectively. The flows are often laden with particles, such as dusts, and are permeated by tangled magnetic fields. These flows are complicated. Protogalaxies with strong formation are expected to show large-scale outflows. These galaxies undergo strong star-forming processes, which lead to frequent supernova events. The supernova explosions not only supply the energy to drive the galactic outflows but also generate shocks and accelerate charged particles to ultra-relativistic energies, i.e. UHE cosmic rays (CRs). The UHE CRs will interact with their host galaxies, causing heating of the interstellar medium. The UHE CRs may be advected out from the galaxies, delivering chemically enriched material and energy to the environments. In this talk the speaker will discuss the properties of multi-phase, multi-component protogalactic outflows and CR heating in the protogalactic environment in the presence of large-scale outflows. 
 
時間:2018.01.23(二) 16:30
地點:香港大學 莊月明物理樓522室
講者:胡建華 教授 Prof. Kinwah Wu(Mullard Space Science Laboratory, University College London, UK) 
語言:英語

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