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SUMMARY:The evolution of the interstellar medium in merging galaxies - Jor
 ge Moreno (Pomona)
DTSTART:20190614T103000Z
DTEND:20190614T113000Z
UID:TALK124459@talks.cam.ac.uk
CONTACT:Martin Haehnelt
DESCRIPTION:In this talk I will review the role of galaxy mergers in trigg
 ering\nstar formation\, and their effect on the interstellar medium. For m
 any\nyears\, observations have suggested that star formation is enhanced i
 n\nmergers. Recently\, however\, a number of IFU  campaigns and HI-survey\
 nsuggest that mergers also enhance the H2 budget in galaxies\, whilst\nlea
 ving its HI content largely unaffected. Understanding how baryons\nmigrate
  between ISM phases and/or become stars is a questions that has\neluded us
 \, because of lack of sufficient resolution in our simulations\nor lack of
  sophisticated models at scales both relevant to galaxies\nand the ISM. I 
 will share recently published results where we employ a\ncomprehensive sui
 te of parsec-scale galaxy merger simulations using\nFIRE\, the "Feedback I
 n Realistic Environment" physics model. This\nframework allows us to resol
 ve Giant Molecular Clouds and follow\nfeedback physical processes that reg
 ulate star formation. I will\ndescribe the ISM as a pipeline where atomic 
 gas can cool and compress\ninto molecular gas\, but the onset of star form
 ation can turn these ISM\ncomponents into warm ionized gas\, or hot gas (w
 ith temperatures above\n1 million Kelvin). The net result is the build-up 
 of a molecular gas\nreservoir\, hand in hand\, with enhanced star formatio
 n - thus providing\na physical picture to H2 and HI observations. If time 
 allows\, I will\ndescribe the role of this baryon cycle in building up ste
 llar bulges\nin galaxies.\n
LOCATION:Kavli Large Meeting Room\, Kavli Building
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