The observed growth of massive galaxy clusters - IV. Robust constraints on neutrino properties

被引：136

作者：

Mantz, A. ^{[1
,2
,3
]}

Allen, S. W. ^{[2
,3
]}

Rapetti, D. ^{[2
,3
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[2] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2010年 / 406卷 / 03期

基金：

美国国家航空航天局;

关键词：

cosmological parameters; cosmology: observations; large-scale structure of Universe; X-rays: galaxies: clusters; DIGITAL SKY SURVEY; X-RAY MEASUREMENTS; DOUBLE-BETA DECAY; LENS TIME DELAYS; DARK ENERGY; COSMOLOGICAL CONSTRAINTS; HUBBLE CONSTANT; POWER SPECTRUM; DATA RELEASE; PARAMETERS;

D O I：

10.1111/j.1365-2966.2010.16794.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This is the fourth of a series of papers in which we derive simultaneous constraints on cosmological parameters and X-ray scaling relations using observations of the growth of massive, X-ray flux-selected galaxy clusters. Our data set consists of 238 clusters drawn from the ROSAT All-Sky Survey and incorporates extensive follow-up observations using the Chandra X-ray Observatory. Here we examine the constraints on neutrino properties that are enabled by the precise and robust constraint on the amplitude of the matter power spectrum at low redshift available from our data. In combination with cluster gas mass fraction, cosmic microwave background, supernova and baryon acoustic oscillation data, and incorporating conservative allowances for systematic uncertainties, we limit the species-summed neutrino mass, M-nu, to < 0.33 eV at 95.4 per cent confidence in a spatially flat, cosmological constant (Lambda CDM) model. In a flat Lambda CDM model where the effective number of neutrino species, N-eff, is allowed to vary, we find N-eff = 3.4+0.6(-0.5) (68.3 per cent confidence, incorporating a direct constraint on the Hubble parameter from Cepheid and supernova data). We also obtain results with additional degrees of freedom in the cosmological model, in the form of global spatial curvature ((k)) and a primordial spectrum of tensor perturbations (r and n(t)). The results are not immune to these generalizations; however, in the most general case we consider, in which M-nu, N-eff, curvature and tensors are all free, we still obtain M-nu < 0.70 eV and N-eff = 3.7 +/- 0.7 (at, respectively, the same confidence levels as above). These results agree well with recent work using independent data and highlight the importance of measuring cosmic structure and expansion at low as well as high (z similar to 1100) redshifts. Although our cluster data extend to redshift z = 0.5, the direct effect of neutrino mass on the growth of structure at late times is not yet detected at a significant level.

引用

页码：1805 / 1814

页数：10

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