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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2607
DTSTART:20120216T213000Z
DTEND:20120216T230000Z
DTSTAMP:20260416T131336Z
LAST-MODIFIED:20120213T174323Z
LOCATION:4421 Sterling Hall
SUMMARY:Through a Glass Darkly: Galaxy Clusters and Strong Lensing\, A
 stronomy Colloquium\, Michael Gladders\, University of Chicago
DESCRIPTION: A detailed and statistically robust visual inspection of 
 the SDSS DR7 imaging footprint\, and similarly the entire RCS-2 cluste
 r catalog\, has produced hundreds of candidate cluster-scale strong le
 nsing systems\, over a volume of approximately 9 Gpc^3 out to a redshi
 fts beyond z=1. An extensive multi-wavelength multi-telescope follow-u
 p program has confirmed the lensing interpretation of several hundred 
 of these lensing candidates\, providing a dramatic increase the total 
 number of known lenses from all previous samples. The resulting sample
 s probe strong lensing from group mass scales all the way to the most 
 massive clusters\, covering two orders of magnitude in mass. These len
 ses inform our understanding of massive dark matter halos through stud
 ies both of the statistics of the source images and lenses\, and detai
 led lensing studies of individual systems. The highly magnified images
  of the lensed sources also provide a unique view into star formation 
 in the early universe\, probing spatial and mass scales otherwise not 
 accessible with current telescopes.<br>
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URL:https://www.physics.wisc.edu/events/?id=2607
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