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

Cong ZhangDepartment of Astronomy, Beijing Normal University, Beijing 100875, China)Han ZhangDepartment of Astronomy, Beijing Normal University, Beijing 100875, China)Shuo YuanDepartment of Astronomy, Beijing Normal University, Beijing 100875, China)Siqi LiuDepartment of Astronomy, Beijing Normal University, Beijing 100875, China)Tong-Jie ZhangDepartment of Astronomy, Beijing Normal University, Beijing 100875, China)Yan-Chun SunDepartment of Astronomy, Beijing Normal University, Beijing 100875, China)

2014en

ABI

Annotatsiya

By adopting the differential age method, we utilize selected 17832 luminous red galaxies (LRGs) from Sloan Digital Sky Survey Data Release Seven (SDSS DR7) covering redshift $0<z<0.4$ to measure Hubble parameters. Using a full spectrum fitting package UlySS, these spectra are reduced with single stellar population (SSP) models and optimal age information of our selected sample are derived. With the decreasing age-redshift relation, four new observational $H(z)$ data (OHD) points are obtained, which are $H(z)=69.0\pm19.6$ km s$^{-1}$ Mpc$^{-1}$ at $z=0.07$, $H(z)=68.6\pm26.2$ km s$^{-1}$ Mpc$^{-1}$ at $z=0.12$, $H(z)$=$72.9\pm29.6$ km s$^{-1}$ Mpc$^{-1}$ at $z=0.2$ and $H(z)$=$88.8\pm36.6$ km s$^{-1}$ Mpc$^{-1}$ at $z=0.28$, respectively. Combined with other 21 available OHD data points, a performance of constraint on both flat and non-flat $\Lambda$CDM model is presented.

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Identifikatorlar

DOI: 10.1088/1674-4527/14/10/002

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