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Correlation of morphological fraction with redshift in galaxy clusters

Published online by Cambridge University Press:  05 March 2015

Qi-Rong Yuan ,
Qiang-Qiang Dang ,
Peng-Fei Yan ,
Wei Chen ,
Zhong-Lue Wen ,
Jin-Lin Han  and
Xu Zhou
Qi-Rong Yuan
Affiliation:
Physics Department, Nanjing Normal University, 1 WenYuan Road, Nanjing 210046, China email: yuanqirong@njnu.edu.cn
Qiang-Qiang Dang
Affiliation:
Physics Department, Nanjing Normal University, 1 WenYuan Road, Nanjing 210046, China email: yuanqirong@njnu.edu.cn
Peng-Fei Yan
Affiliation:
Physics Department, Nanjing Normal University, 1 WenYuan Road, Nanjing 210046, China email: yuanqirong@njnu.edu.cn
Wei Chen
Affiliation:
Physics Department, Nanjing Normal University, 1 WenYuan Road, Nanjing 210046, China email: yuanqirong@njnu.edu.cn
Zhong-Lue Wen
Affiliation:
National Astronomical Observatories, Chinese Academy of Science, 20A Datun Road, Beijing 100012, China
Jin-Lin Han
Affiliation:
National Astronomical Observatories, Chinese Academy of Science, 20A Datun Road, Beijing 100012, China
Xu Zhou
Affiliation:
National Astronomical Observatories, Chinese Academy of Science, 20A Datun Road, Beijing 100012, China
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Abstract

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Based on 187 galaxy clusters identified from the photometric redshifts of galaxies in the Cosmic Evolution Survey (COSMOS) field(Wen & Han 2011), cluster galaxies brighter than MV = -20.5 are classified into four categories according to their best-fitting templates of the spectral energy distributions (SEDs) provided by Ilbert et al. (2009): early-type (including elliptical and lenticular) galaxies (E+S0), spiral galaxies (S), irregular galaxies (Irr), and starbursts (SB). The fractions of these four SED types are presented as the functions of redshift in Figure 1. Fraction of each category varies remarkably with cluster redshift: fractions of normal galaxies (E+S0+S+Irr) tend to decrease with redshift, whilst the starburst proportion tends to increase with redshift. For the normal galaxies, there exists a sequence for the decreasing slopes of morphological fractions. Majority of the galaxies in high-redshift clusters (z > 1.0) are experiencing strong star-formation activities, which leads to a very high proportion of starburst.

Keywords

galaxies: classificationgalaxies: evolutiongalaxies: clusters: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Highlights H16: Highlights of Astronomy , August 2012 , pp. 136
Copyright
Copyright © International Astronomical Union 2015 

References

Ilbert, O., et al. 2009, ApJ, 690, 1236Google Scholar
Wen, Z. & Han, J. 2011, ApJ, 724, 68CrossRefGoogle Scholar