Rejuvenating Power Spectra II: the Gaussianized galaxy density field

Details Rejuvenating Power Spectra II: the Gaussianized galaxy density field Rejuvenating Power Spectra II: the Gaussianized galaxy density field

2010-09-28

arxiv.org/abs/1009.5680v2

Astrophys. J. 731 (2011) 116

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Slight changes to match version accepted to ApJ. 7 pages, 8 figures

Scientific paper

10.1088/0004-637X/731/2/116

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 that depends on the sampling level.

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