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How to suppress the shot noise in galaxy surveys


Seljak, U; Hamaus, N; Desjacques, V (2009). How to suppress the shot noise in galaxy surveys. Physical Review Letters, 103(9):091303.

Abstract

Galaxy surveys are one of the most powerful means to extract cosmological information and for a given volume the attainable precision is determined by the galaxy shot noise σn2 relative to the power spectrum P. It is generally assumed that shot noise is white and given by the inverse of the number density n̅ . In this Letter we argue one may considerably improve upon this due to mass and momentum conservation. We explore this idea with N-body simulations by weighting central halo galaxies by halo mass and find that the resulting shot noise can be reduced dramatically relative to expectations, with a 10–30 suppression at n̅ =4×10-3  (h/Mpc)3. These results open up new opportunities to extract cosmological information in galaxy surveys and may have important consequences for the planning of future redshift surveys.

Galaxy surveys are one of the most powerful means to extract cosmological information and for a given volume the attainable precision is determined by the galaxy shot noise σn2 relative to the power spectrum P. It is generally assumed that shot noise is white and given by the inverse of the number density n̅ . In this Letter we argue one may considerably improve upon this due to mass and momentum conservation. We explore this idea with N-body simulations by weighting central halo galaxies by halo mass and find that the resulting shot noise can be reduced dramatically relative to expectations, with a 10–30 suppression at n̅ =4×10-3  (h/Mpc)3. These results open up new opportunities to extract cosmological information in galaxy surveys and may have important consequences for the planning of future redshift surveys.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:August 2009
Deposited On:27 Feb 2010 13:31
Last Modified:05 Apr 2016 13:56
Publisher:American Physical Society
ISSN:0031-9007
Funders:Packard Foundation, Swiss National Foundation [200021-116696/1], WCU [R32-2008-000-10130-0]
Publisher DOI:10.1103/PhysRevLett.103.091303
Related URLs:http://arxiv.org/abs/0904.2963
Permanent URL: http://doi.org/10.5167/uzh-30865

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