Query : 2000ApJ...532....1R

2000ApJ...532....1R - Astrophys. J., 532, 1-16 (2000/March-3)

Constraining primordial non-gaussianity with the abundance of high-redshift clusters.


Abstract (from CDS):

We show how observations of the evolution of the galaxy cluster number abundance can be used to constrain primordial non-Gaussianity in the universe. We carry out a maximum likelihood analysis incorporating a number of current data sets and accounting for a wide range of sources of systematic error. Under the assumption of Gaussianity, the current data prefer a universe with matter density Ωm≃0.3 and are inconsistent with Ωm=1 at the 2 σ level. If we assume Ωm=1, the predicted degree of cluster evolution is consistent with the data for non-Gaussian models where the primordial fluctuations have at least twice as many peaks of height 3 σ or more as a Gaussian distribution does. These results are robust to almost all sources of systematic error considered: in particular, the Ωm=1 Gaussian case can only be reconciled with the data if a number of systematic effects conspire to modify the analysis in the right direction. Given an independent measurement of Ωm, the techniques described here represent a powerful tool with which to constrain non-Gaussianity in the primordial universe, independent of specific details of the non-Gaussian physics. We discuss the prospects and strategies for improving the constraints with future observations.

Abstract Copyright:

Journal keyword(s): Cosmology: Theory - Galaxies: Clusters: General - Galaxies: Distances and Redshifts

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 481 0
2 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 334 0
3 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 451 0
4 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 698 0

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