THE AGE-REDSHIFT RELATION FOR LUMINOUS RED GALAXIES OBTAINED FROM FULL SPECTRUM FITTING AND ITS COSMOLOGICAL IMPLICATIONS

The relative age of galaxies at different redshifts can be used to infer the Hubble parameter and put constraints on cosmological models. We select luminous red galaxies (LRGs) from the Sloan Digital Sky Survey Data Release 7 and then cross match it with the MPA/JHU catalog of galaxies to obtain a l...

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Bibliographic Details
Published in:The Astrophysical journal 2012-10, Vol.758 (2), p.1-12
Main Authors: Liu, Gaochao, Lu, Youjun, Chen, Xuelei, Zhao, Yongheng, Du, Wei, Meng, Xianmin
Format: Article
Language:English
Subjects:
Astronomy
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BARYONS
Bins
COMPUTERIZED SIMULATION
COSMOLOGICAL MODELS
COSMOLOGY
Dispersions
Earth, ocean, space
EMISSION SPECTRA
ENERGY SPECTRA
Exact sciences and technology
Fittings
GALACTIC EVOLUTION
GALAXIES
Mathematical models
MONTE CARLO METHOD
OSCILLATIONS
RED SHIFT
SIGNAL-TO-NOISE RATIO
Sky surveys (astronomy)
STAR EVOLUTION
STARS
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Summary:The relative age of galaxies at different redshifts can be used to infer the Hubble parameter and put constraints on cosmological models. We select luminous red galaxies (LRGs) from the Sloan Digital Sky Survey Data Release 7 and then cross match it with the MPA/JHU catalog of galaxies to obtain a large sample of quiescent LRGs at redshift z ~ 0.03-0.39. The total number of quiescent LRGs, 23,883, is divided into four sub-samples according to their velocity dispersions and each sub-sample is further divided into 12 redshift bins. With upcoming surveys, such as the Baryon Oscillation Spectroscopic Survey, even larger samples of quiescent massive LRGs may be obtained, and thus the Hubble parameter can be measured with high accuracy using the age-redshift relation.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/758/2/107