Probing Cosmology with Dark Matter Halo Sparsity Using X-Ray Cluster Mass Measurements

被引:20
作者
Corasaniti, P. S. [1 ]
Ettori, S. [2 ,3 ]
Rasera, Y. [1 ]
Sereno, M. [2 ,4 ]
Amodeo, S. [5 ]
Breton, M-A [1 ]
Ghirardini, V [2 ,4 ]
Eckert, D. [6 ]
机构
[1] Univ Paris Diderot, PSL Res Univ, Observ Paris, Sorbonne Paris Cite,LUTH,CNRS, 5 Pl Jules Janssen, F-92195 Meudon, France
[2] INAF, Osservatorio Astron Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy
[3] INFN, Sez Bologna, Viale Berti Pichat 6-2, I-40127 Bologna, Italy
[4] Univ Bologna, Dipartimento Fis & Astron, Via Piero Gobetti 93-2, I-40129 Bologna, Italy
[5] UPMC Univ Paris 6, Observ Paris, Sorbonne Univ, PSL Res Univ,LERMA,CNRS, F-75014 Paris, France
[6] Max Planck Inst Extraterr Phys MPE, Giessenbachstr 1, D-85748 Garching, Germany
基金
欧洲研究理事会;
关键词
cosmological parameters; cosmology: theory; methods: numerical; X-rays: galaxies: clusters; COSMIC STRUCTURE FORMATION; GALAXY CLUSTERS; LENSING CLUSTERS; AGN FEEDBACK; ENERGY; MODELS; IMPACT; IMPRINTS; SCATTER; PROFILE;
D O I
10.3847/1538-4357/aaccdf
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new cosmological probe for galaxy clusters, the halo sparsity. This characterizes halos in terms of the ratio of halo masses measured at two different radii and carries cosmological information encoded in the halo mass profile. Building on the work of Balmes et al., we test the properties of the sparsity using halo catalogs from a numerical N-body simulation of (2.6 Gpc h(-1))(3) volume with 4096(3) particles. We show that at a given redshift the average sparsity can be predicted from prior knowledge of the halo mass function. This provides a quantitative framework to infer cosmological parameter constraints using measurements of the sparsity of galaxy clusters. We show this point by performing a likelihood analysis of synthetic data sets with no systematics, from which we recover the input fiducial cosmology. We also perform a preliminary analysis of potential systematic errors and provide an estimate of the impact of baryonic effects on sparsity measurements. We evaluate the sparsity for a sample of 104 clusters with hydrostatic masses from X-ray observations and derive constraints on the cosmic matter density Omega(m) and the normalization amplitude of density fluctuations at the 8 Mpc h(-1) scale, sigma(8). Assuming no systematics, we find Omega(m) = 0.42 +/- 0.17 and sigma(8) = 0.80 +/- 0.31 at 1 sigma, corresponding to S-8 equivalent to sigma(8)root Omega(m) = 0.48 +/- 0.11. Future cluster surveys may provide opportunities for precise measurements of the sparsity. A sample of a few hundred clusters with mass estimate errors at the few percent level can provide competitive cosmological parameter constraints complementary to those inferred from other cosmic probes.
引用
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页数:16
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