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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-6245
DTSTART:20210128T213000Z
DTEND:20210128T230000Z
DTSTAMP:20260415T023636Z
LAST-MODIFIED:20210112T214900Z
LOCATION:Zoom meeting Coffee and tea 3:30pm\, Talk 3:45 PM
SUMMARY:"Spatially Resolved Galaxy Interactions\, Astronomy Colloquium
 \, Jorge Moreno\, Pomona College
DESCRIPTION:For decades\, late-stage galaxy mergers have been recogniz
 ed as naturally occurring events within the hierarchical LCDM paradigm
 \, capable of triggering starburst and quasars. Early-stage mergers (i
 nteractions)\, albeit not as dramatic as their late-stage counterparts
 \, are believed to shape galaxies in gentler and more long-lasting way
 s: by enhancing star formation\, suppressing gas metallicity\, ignitin
 g AGNs\, augmenting H2 fuel\, etc. But more importantly\, their cumula
 tive effect may ultimately stimulate the transformation of spirals int
 o lenticulars in dense environments. The focus of this talk is to addr
 ess the spatial structure and evolution of star formation and the inte
 rstellar medium (ISM) in interacting galaxies. We use an extensive sui
 te of parsec-scale galaxy merger simulations (stellar mass ratio = 2.5
 :1)\, which employs the "Feedback In Realistic Environments-" model (F
 IRE-2). This framework resolves star formation\, feedback processes\, 
 and the multi-phase structure of the ISM. We focus on the galaxy-pair 
 stages of interaction. We find that close encounters substantially aug
 ment cool (HI) and cold-dense (H2) gas budgets\, elevating the formati
 on of new stars as a result. We also find that galaxies with elevated 
 global star formation rate (SFR) experience intense nuclear SFR enhanc
 ement\, driven by high levels of either star formation efficiency (SFE
 ) or available cold-dense gas fuel. Galaxies with suppressed global SF
 R also contain a nuclear cold-dense gas reservoir\, but low SFE levels
  diminish SFR in the central region. Our numerical predictions undersc
 ore the need of substantially larger\, and/or merger-dedicated\, spati
 ally-resolved (integral-field spectroscopic) galaxy surveys -- capable
  of examining vast and diverse samples of interacting systems -- coupl
 ed with multi-wavelength campaigns aimed to capture their internal ISM
  structure.
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\nZoom Link:
\n
\nhttps://uwmadison.zoom.us/j/885138967
 76?pwd=Y1JtRE1KZllxWkFTamJBSGtGdm9yQT09
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URL:https://www.physics.wisc.edu/events/?id=6245
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