%0 Journal Article
%T Tracing Recent Star Formation of Red Early-type Galaxies out to z ~ 1
%+ Institut d'Astrophysique de Paris (IAP)
%A Ko, Jongwan
%A Hwang, Ho Seong
%A Im, Myungshin
%A Le Borgne, Damien
%A Lee, Jong Chul
%A Elbaz, David
%< avec comité de lecture
%@ 0004-637X
%J The Astrophysical Journal
%I American Astronomical Society
%V 791
%8 2014
%D 2014
%Z 1407.3525
%Z 2014ApJ...791..134K
%R 10.1088/0004-637X/791/2/134
%K galaxies: evolution
%K galaxies: stellar content
%K infrared: galaxies
%K Astrophysics - Astrophysics of Galaxies
%K Astrophysics - Cosmology and Nongalactic Astrophysics
%Z Sciences of the Universe [physics]Journal articles
%X We study the mid-infrared (IR) excess emission of early-type galaxies (ETGs) on the red sequence at z < 1 using a spectroscopic sample of galaxies in the fields of Great Observatories Origins Deep Survey (GOODS). In the mass-limited sample of 1025 galaxies with M star > 1010.5 M ⊙ and 0.4 < z < 1.05, we identify 696 Spitzer 24 μm detected (above the 5σ) galaxies and find them to have a wide range of NUV-r and r-[12 μm] colors despite their red optical u - r colors. Even in the sample of very massive ETGs on the red sequence with M star > 1011.2 M ⊙, more than 18% show excess emission over the photospheric emission in the mid-IR. The combination with the results of red ETGs in the local universe suggests that the recent star formation is not rare among quiescent, red ETGs at least out to z ~ 1 if the mid-IR excess emission results from intermediate-age stars or/and from low-level ongoing star formation. Our color-color diagram including near-UV and mid-IR emissions are efficient not only for identifying ETGs with recent star formation, but also for distinguishing quiescent galaxies from dusty star-forming galaxies.
%G English
%L insu-03645344
%U https://insu.hal.science/insu-03645344
%~ INSU
%~ CNRS
%~ IAP
%~ SORBONNE-UNIVERSITE
%~ SU-INF-2018
%~ SU-SCIENCES
%~ SU-TI
%~ ALLIANCE-SU