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1 results

  • Combining cosmological constraints from cluster counts and galaxy clustering

  • F. Lacasa
  • Journal:
    Proceedings of the International Astronomical Union / Volume 10 / Issue S306 / May 2014
    Published online by Cambridge University Press:
    01 July 2015, pp. 216-218
    Print publication:
    May 2014
    • Article
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  • Present and future large scale surveys offer promising probes of cosmology. For example the Dark Energy Survey (DES) is forecast to detect ~300 millions galaxies and thousands clusters up to redshift ~1.3. I here show ongoing work to combine two probes of large scale structure : cluster number counts and galaxy 2-point function (in real or harmonic space). The halo model (coupled to a Halo Occupation Distribution) can be used to model the cross-covariance between these probes, and I introduce a diagrammatic method to compute easily the different terms involved. Furthermore, I compute the joint non-Gaussian likelihood, using the Gram-Charlier series. Then I show how to extend the methods of Bayesian hyperparameters to Poissonian distributions, in a first step to include them in this joint likelihood.