STRW local: Lunch

Lunch Talks

Fueling Star Formation

The haloes of spiral galaxies connect their inner disks to the inter galactic medium. Additionally they can serve as reservoirs of baryonic matter that can replenish the the star forming gas in the discs of galaxies. However, these haloes are extremely hot with cooling times similar to a Hubble time. Recent modelling shows that the cold gas in the halo, expelled by star formation in the disc, can serve as an catalyser in cooling down the hot halo. This makes the disc-halo connection a crucial element in understanding galaxy evolution and the continued star formation in spiral galaxies. Up to now research in this field has focussed on spiral galaxies, in which extra-planar cold gas has been observed regularly. However, in the last decade it has become clear that many that Early Type Galaxies (ETGs) also contain significant fractions of HI as well as star formation. As the star formation history of ETGs is significantly different from spiral galaxies they provide an excellent opportunity to study the disc-halo connection from a completely new angle. One such ETG, ESO 92-G021, has been found to have a comparatively high rate of star formation and an extended, regular HI disk. In order to study whether this galaxy contains extra-planar neutral hydrogen we have obtained deep observations with the Australia Telescope Compact Array. Through a detailed analysis of the HI distribution in this galaxy I will show the presence of "beard" gas in this galaxy and will discuss the impact on star formation scenarios.


Unless announced otherwise, the lunch talks start at 12:30 sharp. The approximate duration of the lunch talk is given above, and additional time will be given for questions and discussion following the presentation. Please make sure that you take ample time to pick up your lunch beforehand.

Information for Speakers and Hosts: Talks by internal speakers are limited to 20 minutes, with additional time for questions. Visiting speakers can have up to 30 minutes, with additional time for questions. Hosts are responsible for bringing the speaker to the correct room in ample time to set up laptops etc., and for ensuring the speaker also has time for lunch.

For questions and/or suggestions concerning the lunch talks, please contact Themiya Nanayakkara () or Alvaro Hacar ()).