A Sample of E+A Galaxy Candidates in LAMOST Data Released 2

TL;DR

This paper presents a carefully selected sample of 70 E+A galaxy candidates from LAMOST DR2, analyzing their stellar populations and morphology to better understand their characteristics and evolution.

Contribution

It introduces a new sample of E+A galaxies from LAMOST DR2 with detailed stellar population and morphological analysis, expanding knowledge of these galaxies.

Findings

Most E+A galaxies are low redshift (z<0.25).

E+A galaxies have both young and old stellar populations.

Metal-rich populations contribute more than metal-poor ones.

Abstract

A sample of 70 E+A galaxies are selected from 37, 206 galaxies in the second data release (DR2) of Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) 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 locate in the high latitude sky area with magnitude among 14 to 18 mag in g, r and i bands. A stellar population analysis for 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 for these objects is performed based on the images taken from the Sloan Digital Sky Survey (SDSS).