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Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2

Lang, Philipp; Schinnerer, E.; Smail, Ian; Dudzevičiūtė, U.; Swinbank, A.M.; Liu, Daizhong; Leslie, S.K.; Almaini, O.; An, Fang Xia; Bertoldi, F.; Blain, A.W.; Chapman, S.C.; Chen, Chian-Chou; Conselice, C.; Cooke, E.A.; Coppin, K.E.K.; Dunlop, J.S.; Farrah, D.; Fudamoto, Y.; Geach, J.E.; Gullberg, B.; Harrington, K.C.; Hodge, J.A.; Ivison, R.J.; Jiménez-Andrade, E.F.; Magnelli, B.; Michałowski, M.J.; Oesch, P.; Scott, D.; Simpson, J.M.; Smolčić, V.; Stach, S.M.; Thomson, A.P.; Toft, S.; Vardoulaki, E.; Wardlow, J.L.; Weiss, A.; Werf, P. van der

Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2 Thumbnail


Philipp Lang

E. Schinnerer

Daizhong Liu

S.K. Leslie

O. Almaini

Fang Xia An

F. Bertoldi

A.W. Blain

S.C. Chapman

Chian-Chou Chen

C. Conselice

E.A. Cooke

K.E.K. Coppin

J.S. Dunlop

D. Farrah

Y. Fudamoto

J.E. Geach

B. Gullberg

K.C. Harrington

J.A. Hodge

R.J. Ivison

E.F. Jiménez-Andrade

B. Magnelli

M.J. Michałowski

P. Oesch

D. Scott

J.M. Simpson

V. Smolčić

S.M. Stach

A.P. Thomson

S. Toft

E. Vardoulaki

J.L. Wardlow

A. Weiss

P. van der Werf


We combine high-resolution ALMA and HST/CANDELS observations of 20 submillimeter galaxies (SMGs), predominantly from the AS2UDS survey at z sime 2, with bright rest-frame optical counterparts (${K}_{{\rm{s}}}\lesssim 22.9$) to investigate the resolved structural properties of their dust and stellar components. We derive two-dimensional stellar-mass distributions that are inferred from spatial mass-to-light ratio (${\text{}}M/{L}^{* }$) corrections based on rest-frame optical colors. Due to the high central column densities of dust in our SMGs, our mass distributions likely represent a lower limit to the true central mass density. The centroid positions between the inferred stellar-mass and the dust distributions agree within 1.1 kpc, indicating an overall good spatial agreement between the two components. The majority of our sources exhibit compact dust configurations relative to the stellar component (with a median ratio of effective radii ${R}_{{\rm{e}},\mathrm{dust}}/{R}_{{\rm{e}},* }$ = 0.6). This ratio does not change with specific star formation rate over the factor of 30 spanned by our targets, sampling the locus of "normal" main-sequence galaxies up to the starburst regime, $\mathrm{log}(\mathrm{sSFR}/{\mathrm{sSFR}}_{\mathrm{MS}})\geqslant 0.5$. Unlike typical spiral galaxies in the local universe, our results imply that massive SMGs are experiencing centrally enhanced star formation. The sizes and stellar densities of our SMGs are in agreement with those of the passive population at z = 1.5, which is consistent with these systems being the descendants of z sime 2 SMGs.

Journal Article Type Article
Acceptance Date May 3, 2019
Online Publication Date Jul 3, 2019
Publication Date Jul 1, 2019
Deposit Date Jul 17, 2019
Publicly Available Date Jul 17, 2019
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 879
Issue 1
Article Number 54
Public URL


Published Journal Article (5.3 Mb)

Copyright Statement
© 2019. The American Astronomical Society. All rights reserved.

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