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UID:70@osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260320T103000
DTEND;TZID=Europe/Paris:20260320T113000
DTSTAMP:20260306T192844Z
URL:https://osups.universite-paris-saclay.fr/calendrier/commissioning-of-t
 he-vera-c-rubin-observatory-and-weak-gravitational-lensing/
SUMMARY:Commissioning of the Vera C. Rubin Observatory and Weak Gravitation
 al Lensing
DESCRIPTION:par Pierre-Francois Leget  (Princeton/Harvard)\n\nAbstract : \
 n\nThe Rubin Observatory began commissioning LSSTCam in April 2025\, with 
 the Legacy Survey of Space and Time (LSST) scheduled to start in 2026. Pre
 liminary data collected through January 2026 will be publicly released as 
 Data Preview 2 (DP2) in mid-2026. At the end of February 2026\, the observ
 atory reached a major milestone with the first public distribution of real
 -time alerts to community brokers.\n\nOne of the primary science goals is 
 to constrain Dark Energy through weak gravitational lensing — measuring 
 how the shapes of distant galaxies are subtly distorted by the gravitation
 al influence of matter along the line of sight. After just one year of dat
 a\, these measurements are expected to reach a precision comparable to rec
 ent DESI results\, providing an independent test of the intriguing hints t
 hat Dark Energy may evolve over time.\n\nHowever\, weak lensing requires e
 xquisite control of instrumental effects that can mimic or mask the cosmol
 ogical signal. The first months of commissioning have shown that reaching 
 this precision is a significant technical challenge. This seminar will pre
 sent an overview of the Rubin Observatory commissioning — the successes 
 achieved and the systematic issues we are working to resolve.\n\nLieu : 10
 8/1-XX - Grande Salle 108 (carte)
CATEGORIES:Séminaires
LOCATION:IJCLab\, Bât 200\, 15 Rue Georges Clemenceau\, Orsay\, 91400 \, E
 ssonne\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Bât 200\, 15 Rue Georges C
 lemenceau\, Orsay\, 91400 \, Essonne\, France;X-APPLE-RADIUS=100;X-TITLE=I
 JCLab:geo:0,0
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DTSTART:20251026T020000
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