L. Lentati
COLDz: Karl G. Jansky Very Large Array Discovery of a Gas-rich Galaxy in COSMOS
Lentati, L.; Wagg, J.; Carilli, C.L.; Riechers, D.; Capak, P.; Walter, F.; Aravena, M.; da Cunha, E.; Hodge, J.A.; Ivison, R.J.; Smail, I.; Sharon, C.; Daddi, E.; Decarli, R.; Dickinson, M.; Sargent, M.; Scoville, N.; Smolčć, V.
Authors
J. Wagg
C.L. Carilli
D. Riechers
P. Capak
F. Walter
M. Aravena
E. da Cunha
J.A. Hodge
R.J. Ivison
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
C. Sharon
E. Daddi
R. Decarli
M. Dickinson
M. Sargent
N. Scoville
V. Smolčć
Abstract
The broad spectral bandwidth at millimeter and centimeter wavelengths provided by the recent upgrades to the Karl G. Jansky Very Large Array (VLA) has made it possible to conduct unbiased searches for molecular CO line emission at redshifts, z > 1.31. We present the discovery of a gas-rich, star-forming galaxy at z = 2.48 through the detection of CO J = 1-0 line emission in the COLDz survey and through a sensitive, Ka-band (31-39 GHz) VLA survey of a 6.5 arcmin2 region of the COSMOS field. We argue that the broad line (FWHM ~ 570 ± 80 km s–1) is most likely to be CO J = 1-0 at z = 2.48, as the integrated emission is spatially coincident with an infrared-detected galaxy with a photometric redshift estimate of z phot = 3.2 ± 0.4. The CO J = 1-0 line luminosity is $L^{\prime }_{\rm CO} = (2.2\pm 0.3) \times 10^{10}$ K km s–1 pc2, suggesting a cold molecular gas mass of M gas ~ (2-8) × 1010 M ☉ depending on the assumed value of the molecular gas mass to CO luminosity ratio αCO. The estimated infrared luminosity from the (rest-frame) far-infrared spectral energy distribution (SED) is L IR = 2.5 × 1012 L ☉ and the star formation rate is ~250 M ☉ yr–1, with the SED shape indicating substantial dust obscuration of the stellar light. The infrared to CO line luminosity ratio is ~114 ± 19 L ☉/(K km s–1 pc2), similar to galaxies with similar SFRs selected at UV/optical to radio wavelengths. This discovery confirms the potential for molecular emission line surveys as a route to study populations of gas-rich galaxies in the future.
Citation
Lentati, L., Wagg, J., Carilli, C., Riechers, D., Capak, P., Walter, F., …Smolčć, V. (2015). COLDz: Karl G. Jansky Very Large Array Discovery of a Gas-rich Galaxy in COSMOS. Astrophysical Journal, 800(1), Article 67. https://doi.org/10.1088/0004-637x/800/1/67
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 1, 2014 |
Online Publication Date | Feb 10, 2015 |
Publication Date | Feb 10, 2015 |
Deposit Date | Feb 16, 2016 |
Publicly Available Date | Apr 20, 2016 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 800 |
Issue | 1 |
Article Number | 67 |
DOI | https://doi.org/10.1088/0004-637x/800/1/67 |
Public URL | https://durham-repository.worktribe.com/output/1388343 |
Related Public URLs | http://adsabs.harvard.edu/abs/2015ApJ...800...67L |
Files
Published Journal Article
(754 Kb)
PDF
Copyright Statement
© 2015. 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