New technique to select recent fast-quenching galaxies at z ~ 2 using the optical colours

Author:

Kubo Mariko12ORCID,Nagao Tohru2,Uchiyama Hisakazu23,Yamashita Takuji3,Toba Yoshiki234,Kajisawa Masaru2ORCID,Yamamoto Yuta2

Affiliation:

1. Astronomical Institute, Tohoku University , 6-3, Aramaki Aoba, Aoba-ku, Sendai, Miyagi 980-8578 , Japan

2. Research Center for Space and Cosmic Evolution, Ehime University , 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577 , Japan

3. National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 , Japan

4. Academia Sinica Institute of Astronomy and Astrophysics , 11F of Astronomy-Mathematics Building, AS/NTU, No.1, Section 4, Roosevelt Road, Taipei 10617 , Taiwan

Abstract

ABSTRACT Many massive quiescent galaxies have been discovered at z > 2 thanks to multiwavelength deep and wide surveys; however, substantial deep near-infrared spectroscopic observations are needed to constrain their star formation histories statistically. Here, we present a new technique to select quiescent galaxies with a short quenching time-scale (≤0.1 Gyr) at z ∼ 2 photometrically. We focus on a spectral break at ∼1600 Å that appears for such fast-quenching galaxies ∼1 Gyr after quenching when early A-type stars go out, but late A-type stars still live. This spectral break at z ∼ 2 is similar to a Lyman break at z ∼ 4. We construct a set of colour criteria for z ∼ 2 fast-quenching galaxies on g − r versus r − i and i − J versus J − H or $\rm {\it i}-[3.6]$ versus $\rm [3.6]-[4.5]$ colour diagrams, which are available with the existing and/or future wide imaging surveys, by simulating various model galaxy spectra and test their robustnesses using the COSMOS2020 catalogue. Galaxies with photometric and/or spectroscopic redshifts z ∼ 2 and low specific star formation rates are successfully selected using these colours. The number density of these fast-quenching galaxy candidates at z ∼ 2 suggests that massive galaxies not so far above the star formation main sequence at z = 3–4 should be their progenitors.

Funder

JSPS

Tohoku University Center for Gender Equality Promotion

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. The First Quenched Galaxies: When and How?;The Astrophysical Journal Letters;2024-04-22

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