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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-8507
DTSTART:20231128T203000Z
DTEND:20231129T000000Z
DTSTAMP:20260414T031152Z
LAST-MODIFIED:20231116T181411Z
LOCATION:B343 Sterling
SUMMARY:Finding Radio-Loud Strong Gravitational Lenses Using Large Sur
 veys\, Preliminary Exam\, Michael Martinez\, Physics PhD Graduate Stud
 ent
DESCRIPTION:Strong Gravitational Lensing\, the phenomenon by which a b
 ackground source is magnified and split into multiple images by a mass
 ive foreground object\, is one of the most versatile tools to modern a
 strophysicists\, with applications to everything from studying high-re
 dshift galaxy evolution to measuring the Hubble Constant. As lensing i
 s sensitive to all mass along the line of sight from the lensed source
  to the Earth\, it offers sensitivity to dark matter halos even if no 
 luminous stellar population is present. Radio wavelength Very Long Bas
 eline Interferometry (VLBI) observations\, which provide milliarcsecon
 d resolution and complement existing optical and infrared studies\, ar
 e ideal for measuring the perturbations caused by these low-mass halos
 . In this talk\, I present the results of a pilot project to discover 
 new radio-loud gravitationally lensed sources. Using Very Large Array 
 (VLA) follow-up to VLA Sky Survey (VLASS) selected lens candidates\, w
 e report 5 new radio-loud gravitational lenses\, a 10% increase in the
  present sample size. I will also discuss plans for future observation
 s in which we expect to further extend this sample by 50%\, laying the
  groundwork for a statistically robust VLBI program to provide new con
 straints on dark matter.
URL:https://www.physics.wisc.edu/events/?id=8507
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