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UID:UW-Physics-Event-4510
DTSTART:20170309T213000Z
DTEND:20170309T230000Z
DTSTAMP:20260308T134342Z
LAST-MODIFIED:20170303T173023Z
LOCATION:4421 Sterling Hall\, Coffee and Cookies at 3:30 PM. Talk begi
 ns 3:45 PM
SUMMARY:Physical Conditions in the Cold ISM of Nearby Galaxies and The
 ir Relation to Star Formation\, Astronomy Colloquium\, Adam Leroy\, Oh
 io State University
DESCRIPTION:I will present results from several new projects using ALM
 A\, the IRAM mm-wave telescopes\, and soon the Green Bank Telescope to
  map physical conditions in the molecular gas of nearby galaxies. Usin
 g multi-line spectroscopy we are able to constrain the gas density dis
 tribution in each part of the galaxy\, while using high resolution CO 
 imaging we can measure the structure (density\, turbulence\, and self-
 gravity) of the interstellar medium on the scale of individual star-fo
 rming clouds. The ability to make such measurements over a large part 
 of a star forming galaxy is new in the last few years\, thanks to the 
 IRAM programs EMPIRE and PAWS\, the beginning of ALMA operations (and 
 our PHANGS CO survey)\, and upgrades to the GBT. I will show how the a
 mount of dense gas changes across the disk of galaxies\, and illustrat
 e a more nuanced role for gas density in star formation than commonly 
 asserted. I will also show how the basic cloud-scale structure of the 
 cold interstellar medium changes from galaxy-to-galaxy\, reflecting th
 e local environment\, and I will show how these local structural condi
 tions relate to gas density and star formation in the best studied nea
 rby galaxies. Finally\, I will highlight first results several new sur
 veys with ALMA (as part of the PHANGS collaboration) that promise to g
 ive us a sharp new view of cold gas in nearby galaxies over the next y
 ears.
URL:https://www.physics.wisc.edu/events/?id=4510
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