Rejuvenating power spectra. II. The Gaussianized galaxy density field

Mark C. Neyrinck, István Szapudi, Alexander S. Szalay

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We find that, even in the presence of discreteness noise, a Gaussianizing transform (producing a more Gaussian one-point distribution) reduces nonlinearities in the power spectra of cosmological matter and galaxy density fields, in many cases drastically. Although Gaussianization does increase the effective shot noise, it also increases the power spectrum's fidelity to the linear power spectrum on scales where the shot noise is negligible. Gaussianizing also increases the Fisher information in the power spectrum in all cases and resolutions, although the gains are smaller in redshift space than in real space. We also find that the gain in cumulative Fisher information from Gaussianizing peaks at a particular grid resolution depends on the sampling level.

Original languageEnglish
Article number116
JournalAstrophysical Journal
Volume731
Issue number2
DOIs
Publication statusPublished - Apr 20 2011

Keywords

  • cosmology: observations
  • cosmology: theory
  • large-scale structure of universe
  • methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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