Mock Catalogs for DEEP2

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Mock Catalogs for DEEP2

• Renbin Yan, Martin White and
• the DEEP2 Team

Constraining evolution in the Halo Model using
galaxy redshift surveys (astro-ph/0307248,
Astrophys. J. 598 (2003) 848 )by Renbin Yan,
Darren S. Madgwick, Martin White Mock Catalogs
for the DEEP2 redshift survey (astro-ph/0311230)b
y Renbin Yan, Martin White, Alison L. Coil
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The Halo Model
This model provides a meeting ground between
theory and observation, a division between
cosmology and galaxy formation.

• Assumptions
• Galaxies reside in virialized dark matter halos.
• Halos are biased tracers of the underlying
  density field.
• Halo Occupation Distribution, P(NM) The
  probability distribution function of the number
  of galaxies in a halo of mass M.

In the earlier work, using 2dF and DEEP2, we
found P(NM) does not evolve with redshift up to
z1, i.e. galaxies populate dark matter halos
the same way at z1 as at z0.
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Dark matter distribution
256x256x16 (Mpc/h)3
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Dark matter Galaxies
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Galaxy box
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Mock DEEP2 Light-Cone
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The projected two-point correlation function
(0.7
Observation
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The projected two-point correlation function
(0.9
Observation
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Summary

• No-evolution hypothesis in HOD can not be ruled
  out to the redshift z0.8
• ---- Galaxies populate similar dark matter
  halos at z1 as at z0
• Halo Model N-body simulation provides a
  practical way of building realistic mock
  catalogs.
• Having realistic mock catalogs is essential for
  understanding the results of DEEP2.

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The Evolution of the HOD
( Do galaxies populate dark matter halos the same
way at z1 as at z0 ? )

• Null hypothesis The HOD does not evolve with
  redshift.
• Test using 2dF (LF ? (r) ) and DEEP2 ( ?(r) )

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Does no evolution hypothesis work?