The Fundamental Planes of E+A galaxies and GALEX UV-excess early-type galaxies: Revealing their intimate connection
Yumi Choi (1), Tomotsugu Goto (2,3), Suk-Jin Yoon (1) ((1) Yonsei, University, (2) ISAS/JAXA, (3) University of Hawaii)

TL;DR
This study explores the connection between E+A galaxies and UV-excess early-type galaxies, revealing a transitional population called E+a galaxies that bridge the gap in galaxy evolution from starburst to quiescent states.
Contribution
It introduces the concept of E+a galaxies as a new class bridging E+As and red sequence ETGs, based on FP relations and UV-optical colors, highlighting their role in galaxy evolution.
Findings
Identification of UV-excess ETGs bridging E+As and quiescent galaxies.
E+a galaxies are either mild starburst remnants or evolved E+As.
E+a galaxies likely represent the final phase of transition to the red sequence.
Abstract
Strong Balmer absorption lines and the lack of Ha and [OII] emission lines signify that E+As are post-starburst systems. Recent studies suggest that E+As may undergo the transition from the `blue cloud' to the `red sequence' and eventually migrate to red sequence ETGs. An observational validation of this scenario is to identify the intervening galaxy population between E+As and the red-sequence. Motivated by recent findings with GALEX that a large fraction of ETGs exhibit UV-excess as a sign of RSF, we investigate the possible connection of the UV-excess galaxies to E+As. In particular, we examine the FP scaling relations of the largest sample of ~1,000 E+As selected from the SDSS and ~20,000 morphologically-selected SDSS ETGs with GALEX UV data. The FP parameters, combined with stellar population indicators, reveal a certain group of UV-excess ETGs that bridges between E+As and…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena · Stellar, planetary, and galactic studies
