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A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2

Aravena, M. and Spilker, J. S. and Béthermin, M. and Bothwell, M. and Chapman, S. C. and de Breuck, C. and Furstenau, R. M. and Gónzalez-López, J. and Greve, T. R. and Litke, K. and Ma, J. and Malkan, M. and Marrone, D. P. and Murphy, E. J. and Stark, A. and Strandet, M. and Vieira, J. D. and Weiss, A. and Welikala, N. and Wong, G. F. and Collier, J. D. (2016) A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2. Monthly Notices of the Royal Astronomical Society, 457 (4). pp. 4406-4420. ISSN 0035-8711.

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Using the Australia Telescope Compact Array, we conducted a survey of CO J = 1 − 0 and J = 2 − 1 line emission towards strongly lensed high-redshift dusty star-forming galaxies (DSFGs) previously discovered with the South Pole Telescope (SPT). Our sample comprises 17 sources that had CO-based spectroscopic redshifts obtained with the Atacama Large Millimeter/submillimeter Array and the Atacama Pathfinder Experiment. We detect all sources with known redshifts in either CO J = 1 − 0 or J = 2 − 1. 12 sources are detected in the 7-mm continuum. The derived CO luminosities imply gas masses in the range (0.5–11) × 10^(10) M⊙ and gas depletion time-scales t_(dep) < 200 Myr, using a CO to gas mass conversion factor αCO = 0.8 M⊙ (K km s^(−1) pc^2)^(−1). Combining the CO luminosities and dust masses, along with a fixed gas-to-dust ratio, we derive α_(CO) factors in the range 0.4–1.8 M⊙ (K km s^(−1) pc^2)^(−1), similar to what is found in other starbursting systems. We find small scatter in αCO values within the sample, even though inherent variations in the spatial distribution of dust and gas in individual cases could bias the dust-based α_(CO) estimates. We find that lensing magnification factors based on the CO linewidth to luminosity relation (μCO) are highly unreliable, but particularly when μ < 5. Finally, comparison of the gas and dynamical masses suggest that the average molecular gas fraction stays relatively constant at z = 2–5 in the SPT DSFG sample.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Aravena, M.0000-0002-6290-3198
Béthermin, M.0000-0002-3915-2015
de Breuck, C.0000-0002-6637-3315
Malkan, M.0000-0001-6919-1237
Marrone, D. P.0000-0002-2367-1080
Murphy, E. J.0000-0001-7089-7325
Weiss, A.0000-0003-4678-3939
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 February 1. Received 2016 January 31; in original form 2015 November 4. First published online February 9, 2016. MA acknowledges partial support from FONDECYT through grant 1140099. JSS, DPM and JDV acknowledge support from the US National Science Foundation under grant no. AST-1312950. JSS acknowledges support through award SOSPA1-006 from the NRAO. The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. The SPT is supported by the National Science Foundation through grant ANT-0638937, with partial support through PHY-1125897, the Kavli Foundation and the Gordon and Betty Moore Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1140099
National Radio Astronomy Observatory (NRAO)SOSPA1-006
Commonwealth of AustraliaUNSPECIFIED
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:galaxies: evolution – galaxies: formation – galaxies: high-redshift – galaxies: starburst – cosmology: observations
Issue or Number:4
Record Number:CaltechAUTHORS:20160502-151110318
Persistent URL:
Official Citation:M. Aravena, J. S. Spilker, M. Bethermin, M. Bothwell, S. C. Chapman, C. de Breuck, R. M. Furstenau, J. Gónzalez-López, T. R. Greve, K. Litke, J. Ma, M. Malkan, D. P. Marrone, E. J. Murphy, A. Stark, M. Strandet, J. D. Vieira, A. Weiss, N. Welikala, G. F. Wong, and J. D. Collier A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 MNRAS (April 21, 2016) Vol. 457 4406-4420 doi:10.1093/mnras/stw275 first published online February 9, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66599
Deposited By: Tony Diaz
Deposited On:02 May 2016 23:16
Last Modified:09 Mar 2020 13:19

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