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Dust, Gas, and Metal Content in Star-forming Galaxies at z ∼ 3.3 Revealed with ALMA and Near-IR Spectroscopy

Suzuki, Tomoko L.; Onodera, Masato; Kodama, Tadayuki; Daddi, Emanuele; Hayashi, Masao; Koyama, Yusei; Shimakawa, Rhythm; Smail, Ian; Sobral, David; Tacchella, Sandro; Tanaka, Ichi

Dust, Gas, and Metal Content in Star-forming Galaxies at z ∼ 3.3 Revealed with ALMA and Near-IR Spectroscopy Thumbnail


Authors

Tomoko L. Suzuki

Masato Onodera

Tadayuki Kodama

Emanuele Daddi

Masao Hayashi

Yusei Koyama

Rhythm Shimakawa

David Sobral

Sandro Tacchella

Ichi Tanaka



Abstract

We conducted submillimeter observations with the Atacama Large Millimeter/submillimeter Array (ALMA) of star-forming galaxies at z ∼ 3.3, whose gas-phase metallicities have been measured previously. We investigated the dust and gas contents of the galaxies at z ∼ 3.3 and studied the interaction of galaxies with their circumgalactic or intergalactic medium at this epoch by probing their gas mass fractions and gas-phase metallicities. Single-band dust continuum emission tracing dust mass and the relation between the gas-phase metallicity and gas-to-dust mass ratio were used to estimate the gas masses. The estimated gas mass fractions and depletion timescales are fgas= 0.20–0.75 and tdep= 0.09–1.55 Gyr. Although the galaxies appear to be tightly distributed around the star-forming main sequence at z ∼ 3.3, both quantities show a wider spread at a fixed stellar mass than expected from the scaling relation, suggesting a large diversity of fundamental gas properties in star-forming galaxies that apparently lie on the main sequence. When we compared gas mass fraction and gas-phase metallicity in star-forming galaxies at z ∼ 3.3 and at lower redshifts, star-forming galaxies at z ∼ 3.3 appear to be more metal poor than local galaxies with similar gas mass fractions. Using the gas regulator model to interpret this offset, we find that this can be explained by a higher mass-loading factor, suggesting that the mass-loading factor in outflows increases at earlier cosmic times.

Citation

Suzuki, T. L., Onodera, M., Kodama, T., Daddi, E., Hayashi, M., Koyama, Y., …Tanaka, I. (2021). Dust, Gas, and Metal Content in Star-forming Galaxies at z ∼ 3.3 Revealed with ALMA and Near-IR Spectroscopy. Astrophysical Journal, 908(1), https://doi.org/10.3847/1538-4357/abd4e7

Journal Article Type Article
Acceptance Date Dec 16, 2020
Online Publication Date Feb 9, 2021
Publication Date 2021-02
Deposit Date May 5, 2021
Publicly Available Date Mar 29, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 908
Issue 1
DOI https://doi.org/10.3847/1538-4357/abd4e7
Publisher URL https://ui.adsabs.harvard.edu/abs/2021ApJ...908...15S

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© 2021. The American Astronomical Society. All rights reserved.





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