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CATEGORIES:Institute of Astronomy Seminars
SUMMARY:Strong lensing and stellar kinematics of cluster g
 alaxies - Giovanni Granata / University of Portsmo
 uth
DTSTART;TZID=Europe/London:20250305T134000
DTEND;TZID=Europe/London:20250305T140500
UID:TALK229087AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/229087
DESCRIPTION:As the most massive gravitationally bound structur
 es in the Universe\, galaxy clusters frequently ac
 t as strong gravitational lenses. Strong lensing (
 SL) enables us to reconstruct the total mass distr
 ibution of a cluster with extreme accuracy\, provi
 ding insights into the physical properties of dark
  matter and its interplay with baryons. SL models 
 are also crucial for studying magnified high-redsh
 ift sources and measuring cosmological parameters 
 from observed time delays between lensed variable 
 sources. However\, the accuracy of SL models is li
 mited by parametric degeneracy\, which hinders the
  reconstruction of the mass distribution of cluste
 r members. This degeneracy can be resolved using i
 ndependent information from their stellar kinemati
 cs. After a general introduction to SL by galaxy c
 lusters\, I will present how we leveraged deep MUS
 E/VLT observations of SL clusters to build a large
  catalogue of accurate stellar velocity dispersion
  measurements of early-type member galaxies. These
  measurements serve as the foundation for calibrat
 ing new scaling relations that describe their stru
 cture in a set of highly accurate SL models and fo
 r comparisons with cosmological hydrodynamical sim
 ulations of galaxy clusters\, aimed at testing the
  ΛCDM paradigm.\n
LOCATION:The Hoyle Lecture Theatre + Zoom 
CONTACT:
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