Vol 15, No 8 (2015) / Yang

A sample of E+A galaxy candidates in the Second Data Release of LAMOST Survey

Hai-Feng Yang, A-Li Luo, Xiao-Yan Chen, Wen Hou, Jian-Nan Zhang, We Du, Ji-Fu Zhang, Jiang-Hui Cai, Yan-Xin Guo, Shuo Zhang, Hong Wu, Yong-Heng Zhao, Ting-Gui Wang, Shi-Yin Shen, Ming Yang, Yong Zhang, Yong-Hui Hou

Abstract

A sample of 70 E+A galaxies is selected from 37 206 galaxies in the second data release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). This sample is selected according to the criteria for E+A galaxies defined by Goto, and each of these objects is further visually identified. In this sample, most objects are low redshift E+A galaxies with z < 0.25, and are located in an area of the sky with high Galactic latitude and magnitude from 14 to 18 mag in the g, r and i bands. A stellar population analysis of the whole sample indicates that the E+A galaxies are characterized by both young and old stellar populations (SPs), and the metal rich SPs have relatively higher contributions than the metal-poor ones. Additionally, a morphological classification of these objects is performed based on images taken from the Sloan Digital Sky Survey.

Keywords


galaxies: evolution--- galaxies: formation --- galaxies: interactions --- galaxies: peculiar --- galaxies: starburst.

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DOI: https://doi.org/10.1088/1674–4527/15/8/021

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