From feast to famine: understanding active transformation in galaxy groups (Public Lecture)
HI is a key tracer of galaxy fuel, feeding the appetite of star formation, but it also acts as a signpost of tidal interactions. Gas stripped by tidal forces inhibits future star formation, but studies of compact groups have revealed rapid evolution similar to that of the Coma Infall region, suggest...
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| Format: | Other/Unknown Material |
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2014
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| Online Access: | http://hdl.handle.net/1959.3/442452 https://www.saao.ac.za/event/from-feast-to-famine-understanding-active-transformation-in-galaxy-groups/ |
| Summary: | HI is a key tracer of galaxy fuel, feeding the appetite of star formation, but it also acts as a signpost of tidal interactions. Gas stripped by tidal forces inhibits future star formation, but studies of compact groups have revealed rapid evolution similar to that of the Coma Infall region, suggesting an additional mechanism within these much shallower gravitational potential wells. Spitzer spectroscopy has revealed shock-excited H2, most likely tracing collisions with tidally-stripped HI debris. These can be catastrophic, causing the rapid cessation of star formation. Combining the sophisticated group measures from the GAMA survey, optical IFU observations from SAMI, HI observations from KAT-7 and MeerKAT and mid-infrared data from WISE, we aim to address the feeding and feedback nature of neutral gas. |
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