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SUMMARY:The surprising relationship between Lyman break galaxy spectroscop
 ic features\, environment\,   and kinematics - Jeff Cooke (Swinburne)
DTSTART:20110715T103000Z
DTEND:20110715T113000Z
UID:TALK31816@talks.cam.ac.uk
CONTACT:Dr. Manda Banerji
DESCRIPTION:I will present results from our program investigating the spat
 ial distribution of LBGs exhibiting\ndifferent spectroscopic features that
  has uncovered direct links to their environment and kinematics.  \nMotiva
 ted by our recent work investigating interacting z$\\sim$3 LBGs\, we divid
 e the LBG population \ninto two sub-types: one that exhibits dominant Lyma
 n-alpha absorption and broad/strong interstellar \nfeatures (termed aLBGs)
  and one that exhibits dominant Lyman-alpha emission and weak/narrow \nint
 erstellar features (eLBGs).  We use a novel broadband color-magnitude tech
 nique\, tested using \n$\\sim$1000 Keck spectra\, to generate highly pure 
 and large ($\\sim$10000) photometric samples of aLBGs and \neLBGs in the C
 anada-France-Hawaii Telescope Legacy Survey Deep fields.  The large number
 s \nenable a detailed investigation of the spatial distributions of the tw
 o LBG sub-types from large to \nvery small scales using their two-point co
 rrelation functions.  We see a highly significant difference \nin the beha
 vior of the two auto-correlation functions indicating that aLBGs typically
  reside in proto-\ngroups\, whereas eLBGs typically reside in the field.  
 In addition\, an anti-correlation component in \nthe aLBG/eLBG cross-corre
 lation further signifies the intrinsic differences in spatial locations of
  the \ntwo sub-types.  The observed bimodality in the full LBG population 
 - highlighted by these two sub-\npopulations - appears to trace the early 
 formation of the red sequence and blue cloud of galaxies\nobserved locally
 .  Finally\, and equally surprising\, analysis of IFU studies of z$\\sim$2
 -3 LBGs compiled \nfrom the literature find that aLBGs are best fit to dis
 k models and eLBGs to interacting/merging and \ncompact dispersion dominat
 ed systems.  
LOCATION:Kavli LMR\, IoA
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