COSMOS clusters as tracers of LSS

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COSMOS clusters as tracers of LSS

• Alexis Finoguenov
• Max-Planck Institut fuer extraterrestrische
  Physik
• University of Maryland Baltimore County
• Berian James, John Peacock, Gigi Guzzo, Nico
  Cappelluti,
• Henry McCracken, Hans Boehringer, Stefania
  Giodini, Mara Salvato, Nick Scoville, Olivier
  Ilbert, Simon Lilly, Vincenzo Mainieri, John
  Silverman, Katarina Kovac COSMOS

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Photoz z1 z0.7 z0.4 z0.2 IABlt25 X-ray contou
rs
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Identification using 24-band photo-z dz0.02(1z)
160 diffuse sources -20 confused/galaxies 22 zgt1
clusters At z0.2 record on lowest mass For an
X-ray detected group
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Clusters in zCOSMOS 90
LSS at 0.13, 0.22, 0.34, 0.36, 0.38, 0.51, 0.73,
0.89 (Optical groups 0.22,0.36,0.38)
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COSMOS LSS and clusters 10k redshifts
zCOSMOS-BRIGHT VMOS-VLT, 2 sq.degs, IABlt 22.5,
70 sampling, 8 passes, 20k, gt80 success rate
in redshift determination Lilly et al.07 Kovac
et al. in prep.
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COSMOS LSS _at_z0.35
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Redshift ACF for clusters
90 clusters with z
Coil et al. 2006
By Nico Cappelluti
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Calculating the galaxy-cluster correlation
function
0.3ltzlt1.1
Coil et al.06 (DEEP2)
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Trends with mass, redshift LSS
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Conclusions

• X-ray selection results in a representative
  sample of groups with LSS properties similar to
  deepest optical group surveys to date
• The sample is unique to study the effects of halo
  mass and redshift on clustering properties of
  galaxies.

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High redshift clusters
z2.1
z1.2
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Stacked weak lensing