A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2
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 spectr...
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fthighwire:oai:open-archive.highwire.org:mnras:457/4/4406 2023-05-15T18:23:01+02:00 A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 Aravena, M. Spilker, J. S. Bethermin, M. Bothwell, M. Chapman, S. C. de Breuck, C. Furstenau, R. M. Gónzalez-López, J. Greve, T. R. Litke, K. Ma, J. Malkan, M. Marrone, D. P. Murphy, E. J. Stark, A. Strandet, M. Vieira, J. D. Weiss, A. Welikala, N. Wong, G. F. Collier, J. D. 2016-03-07 17:53:18.0 text/html http://mnras.oxfordjournals.org/cgi/content/short/457/4/4406 https://doi.org/10.1093/mnras/stw275 en eng Oxford University Press http://mnras.oxfordjournals.org/cgi/content/short/457/4/4406 http://dx.doi.org/10.1093/mnras/stw275 Copyright (C) 2016, Oxford University Press Article TEXT 2016 fthighwire https://doi.org/10.1093/mnras/stw275 2016-11-16T17:30:34Z 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) × 1010 M ⊙ and gas depletion time-scales t dep < 200 Myr, using a CO to gas mass conversion factor α CO = 0.8 M ⊙ (K km s−1 pc2)−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 pc2)−1, similar to what is found in other starbursting systems. We find small scatter in α CO 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 (μ CO ) 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. Text South pole HighWire Press (Stanford University) South Pole Monthly Notices of the Royal Astronomical Society 457 4 4406 4420 |
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Article Aravena, M. Spilker, J. S. Bethermin, M. Bothwell, M. Chapman, S. C. de Breuck, C. Furstenau, R. M. Gónzalez-López, J. Greve, T. R. Litke, K. Ma, J. Malkan, M. Marrone, D. P. Murphy, E. J. Stark, A. Strandet, M. Vieira, J. D. Weiss, A. Welikala, N. Wong, G. F. Collier, J. D. A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 |
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description |
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) × 1010 M ⊙ and gas depletion time-scales t dep < 200 Myr, using a CO to gas mass conversion factor α CO = 0.8 M ⊙ (K km s−1 pc2)−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 pc2)−1, similar to what is found in other starbursting systems. We find small scatter in α CO 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 (μ CO ) 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. |
format |
Text |
author |
Aravena, M. Spilker, J. S. Bethermin, M. Bothwell, M. Chapman, S. C. de Breuck, C. Furstenau, R. M. Gónzalez-López, J. Greve, T. R. Litke, K. Ma, J. Malkan, M. Marrone, D. P. Murphy, E. J. Stark, A. Strandet, M. Vieira, J. D. Weiss, A. Welikala, N. Wong, G. F. Collier, J. D. |
author_facet |
Aravena, M. Spilker, J. S. Bethermin, M. Bothwell, M. Chapman, S. C. de Breuck, C. Furstenau, R. M. Gónzalez-López, J. Greve, T. R. Litke, K. Ma, J. Malkan, M. Marrone, D. P. Murphy, E. J. Stark, A. Strandet, M. Vieira, J. D. Weiss, A. Welikala, N. Wong, G. F. Collier, J. D. |
author_sort |
Aravena, M. |
title |
A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 |
title_short |
A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 |
title_full |
A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 |
title_fullStr |
A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 |
title_full_unstemmed |
A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 |
title_sort |
survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 |
publisher |
Oxford University Press |
publishDate |
2016 |
url |
http://mnras.oxfordjournals.org/cgi/content/short/457/4/4406 https://doi.org/10.1093/mnras/stw275 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://mnras.oxfordjournals.org/cgi/content/short/457/4/4406 http://dx.doi.org/10.1093/mnras/stw275 |
op_rights |
Copyright (C) 2016, Oxford University Press |
op_doi |
https://doi.org/10.1093/mnras/stw275 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
457 |
container_issue |
4 |
container_start_page |
4406 |
op_container_end_page |
4420 |
_version_ |
1766202430952833024 |