跳转到主要内容

Colloquium by Naomi McClure-Griffiths (Australian National University )

The Milky Way as a Laboratory for Galaxy Evolution

Abstract:

Galaxies are not closed box systems. Their evolution is impacted both by gas lost from the disk via large-scale outflows and gas accreted via various processes of inflow. Many simulations of galaxy formation and evolution have highlighted the importance of feedback in reproducing the observable Universe. Galactic winds are the dominant form of galaxy-scale feedback observed in the nearby and high-redshift Universe. Often emanating from the nuclei of massive galaxies, Galactic winds can circulate hot, enriched gas within a galaxy’s halo and out of its gravitational potential to enrich the surrounding intergalactic medium. And while we know these effects are be on-going, examples where we can observe them in detail are limited. The nuclear wind of the Milky Way provides one of the closest laboratories for Galactic winds in a non-starburst galaxy. The Milky Way’s wind has been the topic of great scrutiny in the past 5 years following the discovery of the Fermi Bubbles, showing that the highly energetic wind extends to ~8 kpc. Recently we have found evidence in 21cm HI emission for voids several kpc in size centered approximately on the Galactic center, both above and below the Galactic plane. These appear to map the boundaries of the Galactic nuclear wind, and anti-correlate with the Fermi Bubbles. In this talk I will describe how atomic hydrogen emission data on the Galactic Centre is helping us to probe the outflow of the Milky Way’s nuclear wind. While gas is constantly lost from the Galaxy via the nuclear wind and other Galactic winds, gas must also accrete onto the Milky Way to help the galaxy maintain its star formation rate. I will discuss new insights into the nature of gas in the halo and what role it might play in gas inflow.
Time: October 12, 2016, 2:30 pm
Venue: A601, NAOC

Copyright © 2018-2020 NAOC All Rights Reserved. 版 权 声 明:
本网站所有内容(包括但不限于文字、图片、文档、视频资料等),版权归属中国科学院国家天文台。所有内容仅限用于学术交流,不能用于商业或盈利用途。
任何媒体、网站或个人未经授权不得转载转贴或以其它方式复制发布/发表,对不遵守本声明或其他违法使用相关内容者,我们保留追究其法律责任的权利。