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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-9769
DTSTART:20260825T170000Z
DTEND:20260825T190000Z
DTSTAMP:20260821T184413Z
LAST-MODIFIED:20260811T145056Z
LOCATION:Chamberlin 5310
SUMMARY:Simulating Radio Strong Gravitational Lenses for the Dark Matt
 er Substructure Inference Problem\, Preliminary Exam\, Joyce Lin
DESCRIPTION:During the next decade\, new astronomical facilities inclu
 ding the Vera C. Rubin Observatory\, Euclid Space Telescope\, Nancy Gr
 ace Roman Space Telescope\, and Square Kilometer Array Observatory wil
 l conduct wide-area surveys that substantially enlarge samples of rare
  astronomical phenomena\, including strong gravitational lenses that c
 an be used to investigate the fundamental nature of dark matter. Withi
 n the future sample of hundreds of thousands of strong lenses\, a subs
 et of those systems with highly magnified arcs will be particularly we
 ll suited for “gravitational imaging” analyses that use astrometri
 c anomalies to probe the abundance and density profiles of low-mass da
 rk matter halos within the main deflector and along the line of sight.
  Very long baseline interferometry (VLBI) observations with milliarcse
 cond-scale angular resolution of radio-bright lensed arcs are sensitiv
 e to dark matter halos with masses down to ~10^6 solar masses\, likely
  below the threshold to host a visible stellar population\, and thus p
 rovide a stringent test of the collision-less cold dark matter paradig
 m. However\, due to the challenge of identifying suitable radio-bright
  strong lenses\, only two such systems have been studied in detail to 
 date. We present a forecast for the sample of strong lens systems that
  could be accessible for gravitational imaging analyses using current 
 and future VLBI networks\, including the Next Generation Very Large Ar
 ray (ngVLA). 
URL:https://www.physics.wisc.edu/events/?id=9769
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