Dominik A. Riechers
COLDz: A High Space Density of Massive Dusty Starburst Galaxies ∼1 Billion Years after the Big Bang
Riechers, Dominik A.; Hodge, Jacqueline A.; Pavesi, Riccardo; Daddi, Emanuele; Decarli, Roberto; Ivison, Rob J.; Sharon, Chelsea E.; Smail, Ian; Walter, Fabian; Aravena, Manuel; Capak, Peter L.; Carilli, Christopher L.; Cox, Pierre; Cunha, Elisabete da; Dannerbauer, Helmut; Dickinson, Mark; Neri, Roberto; Wagg, Jeff
Authors
Jacqueline A. Hodge
Riccardo Pavesi
Emanuele Daddi
Roberto Decarli
Rob J. Ivison
Chelsea E. Sharon
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Fabian Walter
Manuel Aravena
Peter L. Capak
Christopher L. Carilli
Pierre Cox
Elisabete da Cunha
Helmut Dannerbauer
Mark Dickinson
Roberto Neri
Jeff Wagg
Abstract
We report the detection of CO(J = 2 → 1) emission from three massive dusty starburst galaxies at z > 5 through molecular line scans in the NSF's Karl G. Jansky Very Large Array (VLA) CO Luminosity Density at High Redshift (COLDz) survey. Redshifts for two of the sources, HDF 850.1 (z = 5.183) and AzTEC-3 (z = 5.298), were previously known. We revise a previous redshift estimate for the third source GN10 (z = 5.303), which we have independently confirmed through detections of CO J = 1 → 0, 5 → 4, 6 → 5, and [C ii] 158 μm emission with the VLA and the NOrthern Extended Milllimeter Array. We find that two currently independently confirmed CO sources in COLDz are "optically dark", and that three of them are dust-obscured galaxies at z > 5. Given our survey area of ~60 arcmin2, our results appear to imply a ~6–55 times higher space density of such distant dusty systems within the first billion years after the Big Bang than previously thought. At least two of these z > 5 galaxies show star formation rate surface densities consistent with so-called "maximum" starbursts, but we find significant differences in CO excitation between them. This result may suggest that different fractions of the massive gas reservoirs are located in the dense, star-forming nuclear regions—consistent with the more extended sizes of the [C ii] emission compared to the dust continuum and higher [C ii]-to-far-infrared luminosity ratios in those galaxies with lower gas excitation. We thus find substantial variations in the conditions for star formation between z > 5 dusty starbursts, which typically have dust temperatures that are ~57% ± 25% warmer than starbursts at z = 2–3 due to their enhanced star formation activity.
Citation
Riechers, D. A., Hodge, J. A., Pavesi, R., Daddi, E., Decarli, R., Ivison, R. J., …Wagg, J. (2020). COLDz: A High Space Density of Massive Dusty Starburst Galaxies ∼1 Billion Years after the Big Bang. Astrophysical Journal, 895(2), Article 81. https://doi.org/10.3847/1538-4357/ab8c48
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 21, 2020 |
Online Publication Date | May 28, 2020 |
Publication Date | 2020-05 |
Deposit Date | Jun 17, 2020 |
Publicly Available Date | Jun 17, 2020 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 895 |
Issue | 2 |
Article Number | 81 |
DOI | https://doi.org/10.3847/1538-4357/ab8c48 |
Public URL | https://durham-repository.worktribe.com/output/1268246 |
Files
Published Journal Article
(3 Mb)
PDF
Copyright Statement
© 2020. The American Astronomical Society. All rights reserved.
You might also like
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search