HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Tracing Recent Star Formation of Red Early-type Galaxies out to z ~ 1

Abstract : 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.
Document type :
Journal articles
Complete list of metadata

Contributor : Hal Sorbonne Université Gestionnaire Connect in order to contact the contributor
Submitted on : Tuesday, April 19, 2022 - 3:47:53 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:05 AM

Links full text



Jongwan Ko, Ho Seong Hwang, Myungshin Im, Damien Le Borgne, Jong Chul Lee, et al.. Tracing Recent Star Formation of Red Early-type Galaxies out to z ~ 1. The Astrophysical Journal, 2014, 791, ⟨10.1088/0004-637X/791/2/134⟩. ⟨insu-03645344⟩



Record views