How to suppress the shot noise in galaxy surveys
Physical Review Letters, 2009•APS
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 σ n 2
relative to the power spectrum P. It is generally assumed that shot noise is white and given
by the inverse of the number density n¯. 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 …
for a given volume the attainable precision is determined by the galaxy shot noise σ n 2
relative to the power spectrum P. It is generally assumed that shot noise is white and given
by the inverse of the number density n¯. 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 …
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 relative to the power spectrum . It is generally assumed that shot noise is white and given by the inverse of the number density . In this Letter we argue one may considerably improve upon this due to mass and momentum conservation. We explore this idea with -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 . 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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