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Environmental Effects on LRGs as Cosmic Chronometers

Published online by Cambridge University Press:  17 August 2016

Gaochao Liu ,
Youjun Lu ,
Lizhi Xie ,
Xuelei Chen  and
Yongheng Zhao
Gaochao Liu
Affiliation:
College of Science, China Three Gorges University, YiChang 443002, China
Youjun Lu
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China email: [email protected]
Lizhi Xie
Affiliation:
Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Trieste, Via Tiepolo 11, I-34131 Trieste, Italy
Xuelei Chen
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China email: [email protected]
Yongheng Zhao
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China email: [email protected]
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Abstract

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Massive luminous red galaxies (LRGs) are believed to be evolving passively and can be used as cosmic chronometers to estimate the Hubble constant (the differential age method). However, different LRGs may be located in different environments. We investigate the environmental and mass dependence of the formation of ‘quiescent’ LRGs by using the population synthesis software STARLIGHT. We derive the stellar populations in each LRG, and obtain the mean age distribution and the mean star formation history (SFH) of those LRGs. We find that there is no apparent dependence of the mean age and the SFH of quiescent LRGs on their environment, while the ages of these quiescent LRGs depend weakly on their mass. We also evaluate the possible uncertainties in estimating the Hubble constant by the differential age method when using LRGs as cosmic chronometers.

Keywords

cosmological parameters–cosmology:evolution–galaxies:stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S319: Galaxies at High Redshift and Their Evolution Over Cosmic Time , August 2015 , pp. 140
Copyright
Copyright © International Astronomical Union 2016