Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

An imperfectly passive nature : bright submillimeter emission from dust-obscured star formation in the z = 3.717 “passive” system, ZF 20115.

Simpson, J. M. and Smail, Ian and Wang, Wei-Hao and Riechers, D. and Dunlop, J. S. and Ao, Y. and Bourne, N. and Bunker, A. and Chapman, S. C. and Chen, Chian-Chou and Dannerbauer, H. and Geach, J. E. and Goto, T. and Harrison, C. M. and Hwang, H. S. and Ivison, R. J. and Kodama, Tadayuki and Lee, C.-H. and Lee, H.-M. and Lee, M. and Lim, C.-F. and Michałowski, M. J. and Rosario, D. J. and Shim, H. and Shu, X. W. and Swinbank, A. M. and Tee, W.-L. and Toba, Y. and Valiante, E. and Wang, Junxian and Zheng, X. Z. (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). L10.

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.

Item Type:Article
Full text:(VoR) Version of Record
First Live Deposit - 18 August 2017
Download PDF
(742Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.3847/2041-8213/aa7cf2
Publisher statement:© 2017. The American Astronomical Society. All rights reserved.
Record Created:18 Aug 2017 11:28
Last Modified:18 Aug 2017 14:10

Social bookmarking: del.icio.usConnoteaBibSonomyCiteULikeFacebookTwitterExport: EndNote, Zotero | BibTex
Look up in GoogleScholar | Find in a UK Library