ZFOURGE: Using Composite Spectral Energy Distributions to Characterize Galaxy Populations at 1 < z < 4

Article


Forrest, Ben, Tran, Kim-Vy H., Broussard, Adam, Cohn, Jonathan H., Kennicutt, Robert C., Papovich, Casey, Allen, Rebecca, Cowley, Michael, Glazebrook, Karl, Kacprzak, Glenn G., Kawinwanichakij, Lalitwadee, Nanayakkara, Themiya, Salmon, Brett, Spitler, Lee R. and Straatman, Caroline M. S.. 2018. "ZFOURGE: Using Composite Spectral Energy Distributions to Characterize Galaxy Populations at 1 < z < 4." The Astrophysical Journal: an international review of astronomy and astronomical physics. 863 (2), pp. 1-25. https://doi.org/10.3847/1538-4357/aad232
Article Title

ZFOURGE: Using Composite Spectral Energy Distributions to Characterize Galaxy Populations at 1 < z < 4

ERA Journal ID1057
Article CategoryArticle
AuthorsForrest, Ben, Tran, Kim-Vy H., Broussard, Adam, Cohn, Jonathan H., Kennicutt, Robert C., Papovich, Casey, Allen, Rebecca, Cowley, Michael, Glazebrook, Karl, Kacprzak, Glenn G., Kawinwanichakij, Lalitwadee, Nanayakkara, Themiya, Salmon, Brett, Spitler, Lee R. and Straatman, Caroline M. S.
Journal TitleThe Astrophysical Journal: an international review of astronomy and astronomical physics
Journal Citation863 (2), pp. 1-25
Article Number131
Number of Pages25
Year2018
PublisherIOP Publishing
Place of PublicationUnited States
ISSN0004-637X
1538-4357
Digital Object Identifier (DOI)https://doi.org/10.3847/1538-4357/aad232
Web Address (URL)https://iopscience.iop.org/article/10.3847/1538-4357/aad232
Abstract

We investigate the properties of galaxies as they shut off star formation over the 4 billion years surrounding peak cosmic star formation. To do this, we categorize ∼7000 galaxies from 1 < z < 4 into 90 groups based on the shape of their spectral energy distributions (SEDs) and build composite SEDs with R ∼ 50 resolution. These composite SEDs show a variety of spectral shapes and also show trends in parameters such as color, mass, star formation rate, and emission-line equivalent width. Using emission-line equivalent widths and strength of the 4000 Å break, , we categorize the composite SEDs into five classes: extreme emission line, star-forming, transitioning, post-starburst, and quiescent galaxies. The transitioning population of galaxies shows modest Hα emission (EWREST ∼ 40 Å) compared to more typical star-forming composite SEDs at log10(M/M o) ∼ 10.5 (EWREST ∼ 80 Å). Together with their smaller sizes (3 kpc vs. 4 kpc) and higher Sérsic indices (2.7 vs. 1.5), this indicates that morphological changes initiate before the cessation of star formation. The transitional group shows a strong increase of over 1 dex in number density from z ∼ 3 to z ∼ 1, similar to the growth in the quiescent population, while post-starburst galaxies become rarer at z ≲ 1.5. We calculate average quenching timescales of 1.6 Gyr at z ∼ 1.5 and 0.9 Gyr at z ∼ 2.5 and conclude that a fast-quenching mechanism producing post-starbursts dominated the quenching of galaxies at early times, while a slower process has become more common since z ∼ 2.

Keywordsgalaxies: evolution; galaxies: high-redshift
FunderAustralian Research Council
Byline AffiliationsTexas A&M University, United States
University of New South Wales
Australian Astronomical Observatory, Australia
State University of New Jersey, United States
University of Arizona, United States
Swinburne University of Technology
Macquarie University
Leiden University, Netherlands
Space Telescope Science Institute, United States
University of Gent, Belgium
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