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SUMMARY:Rare Views of Ordinary and Extraordinary Galaxies - Brenda Frye (S
 teward)
DTSTART:20150731T103000Z
DTEND:20150731T113000Z
UID:TALK60125@talks.cam.ac.uk
CONTACT:Martin Haehnelt
DESCRIPTION:The galaxies strongly-lensed by foreground galaxy clusters pro
 vide outstanding laboratories to study the physical mechanisms that drive 
 galaxy formation and evolution. Gravitational lensing by massive galaxy cl
 usters is a powerful tool\, allowing one: 1) to boost the brightnesses and
  sizes of the sources\, and 2) to measure the distribution of total mass o
 f dark plus visible matter in the lenses.  Sources with certain favorable 
 geometries of observer\, lens\, and source produce giant arcs and multiply
 -imaged galaxies. We will present spatially-resolved spectroscopy of some 
 of these giant arcs and show how their star forming activities can be foll
 owed along the long axis of the galaxy and traced back onto their exact lo
 cations in the source plane. In one case\, a galaxy source is sufficiently
  bright to enable high signal-to-noise absorption spectroscopy of the inte
 rvening intergalactic medium. The cluster galaxies\, meanwhile\, comprise 
 old\, red elliptical galaxies which are thought to have formed rapidly in 
 an intense burst of star formation around the time of the peak epoch of st
 ar formation (z=2-4).  We will present new data from Planck and Herschel o
 n the search for the progenitors of massive galaxy clusters. The future wi
 ll bring the discovery of the highest redshift galaxies using the combinat
 ion of the James Webb Space Telescope and the right choice of 'optics.'
LOCATION:Kavli LMR\, IoA
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