SIMBAD references

2003ApJ...585..182B - Astrophys. J., 585, 182-190 (2003/March-1)

The cluster function from early Sloan Digital Sky Survey data: cosmological implications.

BAHCALL N.A., DONG F., BODE P., KIM R., ANNIS J., McKAY T.A., HANSEN S., SCHROEDER J., GUNN J., OSTRIKER J.P., POSTMAN M., NICHOL R.C., MILLER C., GOTO T., BRINKMANN J., KNAPP G.R., LAMB D.Q., SCHNEIDER D.P., VOGELEY M.S. and YORK D.G.

Abstract (from CDS):

The mass function of clusters of galaxies is determined from 400 deg2 of early commissioning imaging data of the Sloan Digital Sky Survey using ∼300 clusters in the redshift range z=0.1-0.2. Clusters are selected using two independent selection methods: a matched filter and a red-sequence color-magnitude technique. The two methods yield consistent results. The cluster mass function is compared with large-scale cosmological simulations. We find a best-fit cluster normalization relation of σ8Ω0.6m=0.33±0.03 (for 0.1≲Ωm≲0.4) or, equivalently, σ8=(0.16/Ωm)0.6. The amplitude of this relation is significantly lower than the previous canonical value, implying that either Ωmis lower than previously expected (Ωm=0.16 if σ8=1) or σ8is lower than expected (σ8=0.7 if Ωm=0.3). The shape of the cluster mass function partially breaks this classic degeneracy. We find best-fit parameters of Ωm=0.19±0.080.07and σ8=0.9±0.30.2. High values of Ωm(≳0.4) and low σ8(≲0.6) are excluded at ≳2 σ.

Abstract Copyright:

Journal keyword(s): Cosmology: Cosmological Parameters - Cosmology: Observations - Cosmology: Theory - Cosmology: Dark Matter - Galaxies: Clusters: General - Cosmology: Large-Scale Structure of Universe

Simbad objects: 6

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