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SUMMARY:The Phase Space of Clusters at z ~ 1 as a Tool for Understanding t
 he  Satellite Quenching Process - Adam Muzzin\, Leiden Observatory
DTSTART:20140221T143000Z
DTEND:20140221T153000Z
UID:TALK50991@talks.cam.ac.uk
CONTACT:Paula younger
DESCRIPTION:The position vs. velocity phase space of cluster galaxies enco
 des the accretion history of galaxies onto the cluster\, and is therefore 
 a powerful tool for differentiating between dynamically-young and \ndynami
 cally-old populations. Using a sample of > 400 spectroscopic members in 10
  rich clusters at z ~ 1 from the GCLASS survey\, I will show that the popu
 lations of quiescent\, star-forming\, and post-starburst galaxies in the c
 lusters reside in distinctive regions of position-velocity phase space. In
  particular\, post-starburst galaxies are located in a "ring" at small clu
 stercentric radii\, but high \nclustercentric velocities. A comparison to 
 numerical simulations shows that we can reproduce the phase space location
  of the post-starbursts if they are the descendants of a star-forming popu
 lation that quench \nrapidly after their first crossing of approximately h
 alf the cluster virial radius. This location and timescale for quenching p
 rovide some constraints on the possible mechanisms for environmental quenc
 hing\, and I will discuss these.\n
LOCATION:Martin Ryle Seminar Room\, KICC
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