Halo model analysis of cluster statistics

Eduardo Rozo, Scott Dodelson, Joshua A. Frieman

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We use the halo model formalism to provide expressions for cluster abundances and bias, as well as estimates for the correlation matrix between these observables. Off-diagonal elements due to scatter in the mass-tracer scaling with mass are included, as are observational effects such as biases/scatter in the data, detection rates (completeness), and false detections (purity). We apply the formalism to a hypothetical volume limited optical survey where the cluster mass-tracer is chosen to be the number of satellite galaxies assigned to a cluster. Such a survey can strongly constrain [Formula Presented] ([Formula Presented]), the power law index [Formula Presented] where [Formula Presented] ([Formula Presented]), and perhaps even the Hubble parameter ([Formula Presented]). We find cluster abundances and bias are not well suited for constraining [Formula Presented] or the amplitude [Formula Presented]. We also find that without bias information [Formula Presented] and [Formula Presented] are degenerate, implying constraints on the former are strongly dependent on priors used for the latter and vice-versa. The degeneracy stems from an intrinsic scaling relation of the halo mass function, and hence it should be present regardless of the mass-tracer used in the survey.

Original languageEnglish (US)
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume70
Issue number8
DOIs
StatePublished - 2004

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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