Rejuvenating Power Spectra II: the Gaussianized galaxy density field

Дата и время публикации : 2010-09-28T20:05:59Z

Авторы публикации и институты :
Mark C. Neyrinck
István Szapudi
Alexander S. Szalay

Ссылка на журнал-издание: Astrophys. J. 731 (2011) 116
Коментарии к cтатье: Slight changes to match version accepted to ApJ. 7 pages, 8 figures
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: 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.

Category: Physics