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The Cosmological Constant
Cluster Baryon Fraction

Basic Idea: Know number of baryons from big bang nucleosynthesis, and estimate limit on their fraction from galaxy clusters to get upper mass limit. "Cluster baryon catastrophe."

Systems of interest: Galaxy clusters

  • discussed in structure formation section


  • Assumptions: "fair sample", equilibrium, smooth, all baryons in gas
  • Current Results
  • Caveats and criticisms

Some References

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Comments or Questions? Contact jcohn@astron.berkeley.edu