Details

Autor(en) / Beteiligte

• Seljak, Uros
• Hamaus, Nico
• Desjacques, Vincent

Titel

How to suppress the shot noise in galaxy surveys

Ist Teil von

• Physical review letters, 2009-08, Vol.103 (9), p.091303-091303, Article 091303

Ort / Verlag

United States

Erscheinungsjahr

2009

Quelle

PROLA

Beschreibungen/Notizen

• 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 sigma(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[over ]. 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 n[over ] = 4x10(-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.