J.M. Simpson
An Imperfectly Passive Nature: Bright Submillimeter Emission from Dust-obscured Star Formation in the z = 3.717 “Passive” System, ZF 20115
Simpson, J.M.; Smail, Ian; Wang, Wei-Hao; Riechers, D.; Dunlop, J.S.; Ao, Y.; Bourne, N.; Bunker, A.; Chapman, S.C.; Chen, Chian-Chou; Dannerbauer, H.; Geach, J.E.; Goto, T.; Harrison, C.M.; Hwang, H.S.; Ivison, R.J.; Kodama, Tadayuki; Lee, C.-H.; Lee, H.-M.; Lee, M.; Lim, C.-F.; Michałowski, M.J.; Rosario, D.J.; Shim, H.; Shu, X.W.; Swinbank, A.M.; Tee, W.-L.; Toba, Y.; Valiante, E.; Wang, Junxian; Zheng, X.Z.
Authors
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Wei-Hao Wang
D. Riechers
J.S. Dunlop
Y. Ao
N. Bourne
A. Bunker
S.C. Chapman
Chian-Chou Chen
H. Dannerbauer
J.E. Geach
T. Goto
C.M. Harrison
H.S. Hwang
R.J. Ivison
Tadayuki Kodama
C.-H. Lee
H.-M. Lee
M. Lee
C.-F. Lim
M.J. Michałowski
D.J. Rosario
H. Shim
X.W. Shu
A.M. Swinbank
W.-L. Tee
Y. Toba
E. Valiante
Junxian Wang
X.Z. Zheng
Abstract
The identification of high-redshift, massive galaxies with old stellar populations may pose challenges to some models of galaxy formation. However, to securely classify a galaxy as quiescent, it is necessary to exclude significant ongoing star formation, something that can be challenging to achieve at high redshifts. In this Letter, we analyze deep ALMA/870 μm and SCUBA-2/450 μm imaging of the claimed "post-starburst" galaxy ZF 20115 at z = 3.717 that exhibits a strong Balmer break and absorption lines. The rest-frame far-infrared imaging identifies a luminous starburst 0farcs4 ± 0farcs1 (~3 kpc in projection) from the position of the ultraviolet/optical emission and is consistent with lying at the redshift of ZF 20115. The star-forming component, with an obscured star formation rate of ${100}_{-70}^{+15}\,{M}_{\odot }\,{\mathrm{yr}}^{-1}$, is undetected in the rest-frame ultraviolet but contributes significantly to the lower angular resolution photometry at rest-frame wavelengths gsim3500 Å. This contribution from the obscured starburst, especially in the Spitzer/IRAC wavebands, significantly complicates the determination of a reliable stellar mass for the ZF 20015 system, and we conclude that this source does not pose a challenge to current models of galaxy formation. The multi-wavelength observations of ZF 20115 unveil a complex system with an intricate and spatially varying star formation history. ZF 20115 demonstrates that understanding high-redshift obscured starbursts will only be possible with multi-wavelength studies that include high-resolution observations, available with the James Webb Space Telescope, at mid-infrared wavelengths.
Citation
Simpson, J., Smail, I., Wang, W., Riechers, D., Dunlop, J., Ao, Y., …Zheng, X. (2017). An Imperfectly Passive Nature: Bright Submillimeter Emission from Dust-obscured Star Formation in the z = 3.717 “Passive” System, ZF 20115. Astrophysical Journal Letters, 844(1), Article L10. https://doi.org/10.3847/2041-8213/aa7cf2
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 15, 2017 |
Online Publication Date | Jul 19, 2017 |
Publication Date | Jul 19, 2017 |
Deposit Date | Aug 18, 2017 |
Publicly Available Date | Aug 18, 2017 |
Journal | Astrophysical Journal Letters |
Print ISSN | 2041-8205 |
Electronic ISSN | 2041-8213 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 844 |
Issue | 1 |
Article Number | L10 |
DOI | https://doi.org/10.3847/2041-8213/aa7cf2 |
Public URL | https://durham-repository.worktribe.com/output/1352001 |
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Copyright Statement
© 2017. The American Astronomical Society. All rights reserved.
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