Riccardo Pavesi
The CO Luminosity Density at High-z (COLDz) Survey: A Sensitive, Large-area Blind Search for Low-J CO Emission from Cold Gas in the Early Universe with the Karl G. Jansky Very Large Array
Pavesi, Riccardo; Sharon, Chelsea E.; Riechers, Dominik A.; Hodge, Jacqueline A.; Decarli, Roberto; Walter, Fabian; Carilli, Chris L.; Daddi, Emanuele; Smail, Ian; Dickinson, Mark; Ivison, Rob J.; Sargent, Mark; Cunha, Elisabete da; Aravena, Manuel; Darling, Jeremy; Smolčić, Vernesa; Scoville, Nicholas Z.; Capak, Peter L.; Wagg, Jeff
Authors
Chelsea E. Sharon
Dominik A. Riechers
Jacqueline A. Hodge
Roberto Decarli
Fabian Walter
Chris L. Carilli
Emanuele Daddi
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Mark Dickinson
Rob J. Ivison
Mark Sargent
Elisabete da Cunha
Manuel Aravena
Jeremy Darling
Vernesa Smolčić
Nicholas Z. Scoville
Peter L. Capak
Jeff Wagg
Abstract
We describe the CO Luminosity Density at High-z (COLDz) survey, the first spectral line deep field targeting CO(1–0) emission from galaxies at z = 1.95–2.85 and CO(2–1) at z = 4.91–6.70. The main goal of COLDz is to constrain the cosmic density of molecular gas at the peak epoch of cosmic star formation. By targeting both a wide (~51 arcmin2) and a deep (~9 arcmin2) area, the survey is designed to robustly constrain the bright end and the characteristic luminosity of the CO(1–0) luminosity function. An extensive analysis of the reliability of our line candidates and new techniques provide detailed completeness and statistical corrections as necessary to determine the best constraints to date on the CO luminosity function. Our blind search for CO(1–0) uniformly selects starbursts and massive main-sequence galaxies based on their cold molecular gas masses. Our search also detects CO(2–1) line emission from optically dark, dusty star-forming galaxies at z > 5. We find a range of spatial sizes for the CO-traced gas reservoirs up to ~40 kpc, suggesting that spatially extended cold molecular gas reservoirs may be common in massive, gas-rich galaxies at z ~ 2. Through CO line stacking, we constrain the gas mass fraction in previously known typical star-forming galaxies at z = 2–3. The stacked CO detection suggests lower molecular gas mass fractions than expected for massive main-sequence galaxies by a factor of ~3–6. We find total CO line brightness at ~34 GHz of 0.45 ± 0.2 μK, which constrains future line intensity mapping and CMB experiments.
Citation
Pavesi, R., Sharon, C. E., Riechers, D. A., Hodge, J. A., Decarli, R., Walter, F., …Wagg, J. (2018). The CO Luminosity Density at High-z (COLDz) Survey: A Sensitive, Large-area Blind Search for Low-J CO Emission from Cold Gas in the Early Universe with the Karl G. Jansky Very Large Array. Astrophysical Journal, 864(1), Article 49. https://doi.org/10.3847/1538-4357/aacb79
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 6, 2018 |
Online Publication Date | Aug 29, 2018 |
Publication Date | Aug 29, 2018 |
Deposit Date | Sep 13, 2018 |
Publicly Available Date | Sep 13, 2018 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 864 |
Issue | 1 |
Article Number | 49 |
DOI | https://doi.org/10.3847/1538-4357/aacb79 |
Public URL | https://durham-repository.worktribe.com/output/1314712 |
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© 2018. The American Astronomical Society. All rights reserved.
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