C.-C. Chen
An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: Near-infrared Morphologies and Stellar Sizes
Chen, C.-C.; Smail, I.; Swinbank, A.M.; Simpson, J.M.; Ma, C.-J.; Alexander, D.M.; Biggs, A.D.; Brandt, W.N.; Chapman, S.C.; Coppin, K.E.K.; Danielson, A.L.R.; Dannerbauer, H.; Edge, A.C.; Greve, T.R.; Ivison, R.J.; Karim, A.; Menten, K.M.; Schinnerer, E.; Walter, F.; Wardlow, J.L.; Weiss, A.; van der Werf, P.P.
Authors
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor
J.M. Simpson
C.-J. Ma
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
A.D. Biggs
W.N. Brandt
S.C. Chapman
K.E.K. Coppin
A.L.R. Danielson
H. Dannerbauer
Professor Alastair Edge alastair.edge@durham.ac.uk
Professor
T.R. Greve
R.J. Ivison
A. Karim
K.M. Menten
E. Schinnerer
F. Walter
J.L. Wardlow
A. Weiss
P.P. van der Werf
Abstract
We analyze Hubble Space Telescope WFC3/H 160-band observations of a sample of 48 Atacama Large Millimeter/submillimeter Array detected submillimeter galaxies (SMGs) in the Extended Chandra Deep Field South field, to study their stellar morphologies and sizes. We detect 79% ± 17% of the SMGs in the H 160-band imaging with a median sensitivity of 27.8 mag, and most (80%) of the nondetections are SMGs with 870 μm fluxes of S 870 < 3 mJy. With a surface brightness limit of μ H ~ 26 mag arcsec–2, we find that 82% ± 9% of the H 160-band-detected SMGs at z = 1-3 appear to have disturbed morphologies, meaning they are visually classified as either irregulars or interacting systems, or both. By determining a Sérsic fit to the H 160 surface brightness profiles, we derive a median Sérsic index of n = 1.2 ± 0.3 and a median half-light radius of re = 4.4$^{+1.1}_{-0.5}$ kpc for our SMGs at z = 1-3. We also find significant displacements between the positions of the H 160 component and 870 μm emission in these systems, suggesting that the dusty starburst regions and less-obscured stellar distribution are not colocated. We find significant differences in the sizes and the Sérsic index between our z = 2-3 SMGs and z ~ 2 quiescent galaxies, suggesting that a major transformation of the stellar light profile is needed in the quenching processes if SMGs are progenitors of the red-and-dead z ~ 2 galaxies. Given the short-lived nature of SMGs, we postulate that the majority of the z = 2-3 SMGs with S 870 gsim 2 mJy are early/mid-stage major mergers.
Journal Article Type | Article |
---|---|
Publication Date | Feb 1, 2015 |
Deposit Date | Jan 30, 2015 |
Publicly Available Date | Apr 13, 2015 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 799 |
Issue | 2 |
Article Number | 194 |
DOI | https://doi.org/10.1088/0004-637x/799/2/194 |
Keywords | Cosmology: observations, Galaxies: formation, Galaxies: starburst, Submillimeter: galaxies. |
Public URL | https://durham-repository.worktribe.com/output/1437505 |
Related Public URLs | http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1412.0668 |
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© 2015. The American Astronomical Society. All rights reserved.
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