Four new observational H(z) data from luminous red galaxies in the Sloan Digital Sky Survey data release seven

被引：2

作者：

Cong Zhang ^{[1
]}

Han Zhang ^{[1
]}

Shuo Yuan ^{[1
]}

Siqi Liu ^{[1
]}

Tong-Jie Zhang ^{[1
]}

Yan-Chun Sun ^{[1
]}

机构：

[1] Department of Astronomy,Beijing Normal University

来源：

ResearchinAstronomyandAstrophysics | 2014年 / 14卷 / 10期

基金：

中国国家自然科学基金;

关键词：

cosmology; cosmological parameters-cosmology; observationsgalaxies; evolution;

D O I：

暂无

中图分类号：

P159.4 [观测宇宙学];

学科分类号：

070401 ;

摘要：

By adopting the differential age method,we select 17 832 luminous red galaxies from the Sloan Digital Sky Survey Data Release Seven covering redshift0 < z < 0.4 to measure the Hubble parameter.Using the full spectrum fitting package UlySS,these spectra are reduced with single stellar population models and optimal age information from our selected sample is derived.With the decreasing age-redshift relation,four new observational H{z) data(OHD) points are obtained,which are H{z) = 69.0± 19.6km sMpcat z = 0.07,H(z) = 68.6 ±26.2 km sMpcat z = 0.12,H(z)=72.9 ± 29.6 km sMpcat z = 0.2 and H{z)=88.8 ± 36.6 km sMpcat z = 0.28,respectively.Combined with 21 other available OHD data points,the performance of the constraint on both flat and non-flat ACDM models is presented.

引用

页码：1221 / 1233

页数：13

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