Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-30865
Seljak, U; Hamaus, N; Desjacques, V (2009). How to suppress the shot noise in galaxy surveys. Physical Review Letters, 103(9):091303.
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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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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Deposited On:||27 Feb 2010 13:31|
|Last Modified:||28 Nov 2013 00:36|
|Publisher:||American Physical Society|
|Funders:||Packard Foundation, Swiss National Foundation [200021-116696/1], WCU [R32-2008-000-10130-0]|
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