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SUMMARY:Strong lensing and stellar kinematics of cluster galaxies - Giovan
 ni Granata / University of Portsmouth
DTSTART:20250305T134000Z
DTEND:20250305T140500Z
UID:TALK229087@talks.cam.ac.uk
CONTACT:128254
DESCRIPTION:As the most massive gravitationally bound structures in the Un
 iverse\, galaxy clusters frequently act as strong gravitational lenses. St
 rong lensing (SL) enables us to reconstruct the total mass distribution of
  a cluster with extreme accuracy\, providing insights into the physical pr
 operties of dark matter and its interplay with baryons. SL models are also
  crucial for studying magnified high-redshift sources and measuring cosmol
 ogical parameters from observed time delays between lensed variable source
 s. However\, the accuracy of SL models is limited by parametric degeneracy
 \, which hinders the reconstruction of the mass distribution of cluster me
 mbers. This degeneracy can be resolved using independent information from 
 their stellar kinematics. After a general introduction to SL by galaxy clu
 sters\, I will present how we leveraged deep MUSE/VLT observations of SL c
 lusters to build a large catalogue of accurate stellar velocity dispersion
  measurements of early-type member galaxies. These measurements serve as t
 he foundation for calibrating new scaling relations that describe their st
 ructure in a set of highly accurate SL models and for comparisons with cos
 mological hydrodynamical simulations of galaxy clusters\, aimed at testing
  the ΛCDM paradigm.\n
LOCATION:The Hoyle Lecture Theatre + Zoom 
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