2007/03/23 by Tomotsugu Goto, T. Goto · 1 citation
Physics and Astronomy · #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2007.11674.x
published as Mon.Not.Roy.Astron.Soc.377:1222-1228,2007 · Accepted for publication in MNRAS
arxiv created 2007/03/23 · openalex publication_date 2007/05/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
E+A galaxies are characterized as galaxies with strong Balmer absorption lines but without any [O ii] or Hα emission lines. The existence of strong Balmer absorption lines means that E+A galaxies have experienced a starburst within the last <1–1.5 Gyr. However, the lack of [O ii] or Hα emission lines indicates that E+A galaxies do not have any ongoing star formation. Therefore, E+A galaxies are interpreted as post-starburst galaxies. Morphologically, E+A galaxies appear as early-type galaxies, implying that E+A galaxies may be one of the progenitors of present-day elliptical galaxies. However, there remain other possibilities, such as the dusty starburst scenario, where E+A galaxies have ongoing star formation, but optical emission lines are invisible as a result of heavy obscuration by dust. Therefore, additional evidence of the post-starburst phenomenon has been eagerly awaited. Using one of the largest samples of 451 E+A galaxies carefully selected from the Sloan Digital Sky Survey Data Release 4, here we show the abundance diagnosis of E+A galaxies using Mg and Fe lines. Our findings are as follows. (i) E+A galaxies have an enhanced α-element abundance ratio compared to star-forming galaxies with similar Balmer absorption strength. Because the truncation of strong starburst is required to enhance the α-element ratio, this is additional evidence that E+A galaxies are in the post-starburst phase. (ii) The metallicity and α-element abundance of E+A galaxies are consistent with those of elliptical galaxies, suggesting that E+A galaxies could be one of the progenitors of present-day elliptical galaxies in terms of chemical abundances.