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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.
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Submitted on : Tuesday, April 19, 2022 - 3:47:53 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:05 AM

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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⟩

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