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ALMA 1.3 mm Survey of Lensed Submillimeter Galaxies Selected by Herschel: Discovery of Spatially Extended SMGs and Implications

Sun, Fengwu; Egami, Eiichi; Rawle, Timothy D.; Walth, Gregory L.; Smail, Ian; Dessauges-Zavadsky, Miroslava; Pérez-González, Pablo G.; Richard, Johan; Combes, Francoise; Ebeling, Harald; Pelló, Roser; Van der Werf, Paul; Altieri, Bruno; Boone, Frédéric; Cava, Antonio; Chapman, Scott C.; Clément, Benjamin; Finoguenov, Alexis; Nakajima, Kimihiko; Rujopakarn, Wiphu; Schaerer, Daniel; Valtchanov, Ivan

ALMA 1.3 mm Survey of Lensed Submillimeter Galaxies Selected by Herschel: Discovery of Spatially Extended SMGs and Implications Thumbnail


Authors

Fengwu Sun

Eiichi Egami

Timothy D. Rawle

Gregory L. Walth

Miroslava Dessauges-Zavadsky

Pablo G. Pérez-González

Johan Richard

Francoise Combes

Harald Ebeling

Roser Pelló

Paul Van der Werf

Bruno Altieri

Frédéric Boone

Antonio Cava

Scott C. Chapman

Benjamin Clément

Alexis Finoguenov

Kimihiko Nakajima

Wiphu Rujopakarn

Daniel Schaerer

Ivan Valtchanov



Abstract

We present an ALMA 1.3 mm (Band 6) continuum survey of lensed submillimeter galaxies (SMGs) at z = 1.0 to ∼3.2 with an angular resolution of ∼0farcs2. These galaxies were uncovered by the Herschel Lensing Survey and feature exceptionally bright far-infrared continuum emission (Speak ≳ 90 mJy) owing to their lensing magnification. We detect 29 sources in 20 fields of massive galaxy clusters with ALMA. Using both the Spitzer/IRAC (3.6/4.5 μm) and ALMA data, we have successfully modeled the surface brightness profiles of 26 sources in the rest-frame near- and far-infrared. Similar to previous studies, we find the median dust-to-stellar continuum size ratio to be small (Re,dust/Re,star = 0.38 ± 0.14) for the observed SMGs, indicating that star formation is centrally concentrated. This is, however, not the case for two spatially extended main-sequence SMGs with a low surface brightness at 1.3 mm (≲0.1 mJy arcsec−2), in which the star formation is distributed over the entire galaxy (Re,dust/Re,star > 1). As a whole, our SMG sample shows a tight anticorrelation between (Re,dust/Re,star) and far-infrared surface brightness (ΣIR) over a factor of ≃1000 in ΣIR. This indicates that SMGs with less vigorous star formation (i.e., lower ΣIR) lack central starburst and are likely to retain a broader spatial distribution of star formation over the whole galaxies (i.e., larger Re,dust/Re,star). The same trend can be reproduced with cosmological simulations as a result of central starburst and potentially subsequent "inside-out" quenching, which likely accounts for the emergence of compact quiescent galaxies at z ∼ 2.

Citation

Sun, F., Egami, E., Rawle, T. D., Walth, G. L., Smail, I., Dessauges-Zavadsky, M., …Valtchanov, I. (2021). ALMA 1.3 mm Survey of Lensed Submillimeter Galaxies Selected by Herschel: Discovery of Spatially Extended SMGs and Implications. Astrophysical Journal, 908(2), Article 192. https://doi.org/10.3847/1538-4357/abd6e4

Journal Article Type Article
Acceptance Date Dec 24, 2020
Online Publication Date Feb 24, 2021
Publication Date 2021-02
Deposit Date May 5, 2021
Publicly Available Date Mar 28, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 908
Issue 2
Article Number 192
DOI https://doi.org/10.3847/1538-4357/abd6e4

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





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