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SUMMARY:The evolution of the interstellar medium in merging galaxies - Jor
 ge Moreno (Pomona College / ITC)
DTSTART:20190617T103000Z
DTEND:20190617T113000Z
UID:TALK125842@talks.cam.ac.uk
CONTACT:Steven Brereton
DESCRIPTION:In this talk I will review the role of galaxy mergers in trigg
 ering star formation\, and their effect on the interstellar medium. For ma
 ny years\, observations have suggested that star formation is enhanced in 
 mergers. Recently\, however\, a number of IFU campaigns and HI-survey sugg
 est that mergers also enhance the H2 budget in galaxies\, whilst leaving i
 ts HI content largely unaffected. Understanding how baryons migrate betwee
 n ISM phases and/or become stars is a questions that has eluded us\, becau
 se of lack of sufficient resolution in our simulations or lack of sophisti
 cated models at scales both relevant to galaxies and the ISM. I will share
  recently published results where we employ a comprehensive suite of parse
 c-scale galaxy merger simulations using FIRE\, the "Feedback In Realistic 
 Environment" physics model. This framework allows us to resolve Giant Mole
 cular Clouds and follow feedback physical processes that regulate star for
 mation. I will describe the ISM as a pipeline where atomic gas can cool an
 d compress into molecular gas\, but the onset of star formation can turn t
 hese ISM components into warm ionized gas\, or hot gas (with temperatures 
 above 1 million Kelvin). The net result is the build-up of a molecular gas
  reservoir\, hand in hand\, with enhanced star formation - thus providing 
 a physical picture to H2 and HI observations. If time allows\, I will desc
 ribe the role of this baryon cycle in building up stellar bulges in galaxi
 es.
LOCATION:Sackler Lecture Theatre\, IoA
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