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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3066
DTSTART:20131010T203000Z
DTEND:20131010T220000Z
DTSTAMP:20260419T212138Z
LAST-MODIFIED:20130909T125554Z
LOCATION:4421 Sterling Hall
SUMMARY:Constraining the Cosmological Evolution of Galaxies Using Bars
 \, Astronomy Colloquium\, Kartik Sheth\, NRAO
DESCRIPTION:Stellar bars are a key signpost in the evolutionary histor
 y of a disk<br>
\ngalaxy. When a disk is sufficiently massive\, dynami
 cally cold and<br>
\nrotationally supported\, and sufficient time has 
 elapsed for the<br>
\nbaryonic matter to exchange energy and angular m
 omentum with the dark<br>
\nmatter halo or the outer disk\, the format
 ion of a bar is inevitable.<br>
\nTherefore understanding the evolutio
 n of the bar fraction as a<br>
\nfunction of the host galaxy propertie
 s and as a function of redshift<br>
\nprovides important clues to the 
 evolutionary history of galaxies.  I<br>
\nwill present the latest res
 ults on local bars from the Spitzer Survey<br>
\nof Stellar Structure 
 in Galaxies (S4G) and discuss the observations<br>
\nfor the declining
  bar fraction with redshift from the COSMOS survey.<br>
\nA plausible 
 reason for the decline in the bar fraction may be that<br>
\ngalaxy di
 sks were too dynamically hot to host bars at higher redshift<br>
\nwhi
 ch we have investigated using the DEEP2 / AEGIS data. Together<br>
\nt
 hese data are beginning to provide a coherent and consistent picture<b
 r>
\nfor the assembly history of disks on the Hubble sequence.  Using 
 ALMA<br>
\nwe are also studying the evolution of the molecular gas  co
 ntent (and<br>
\nassociated star formation) as a function of redshift 
 and in greater<br>
\ndetail with spatially resolved observations of ne
 arby spirals.  I will<br>
\ndescribe the latest results of our on-goin
 g investigations on galaxy<br>
\nevolution and star formation with ALM
 A.<br>
\n
URL:https://www.physics.wisc.edu/events/?id=3066
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