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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ftcaltechauth:oai:authors.library.caltech.edu:66599 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. Béthermin, 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. 2016-04-21 application/pdf https://authors.library.caltech.edu/66599/ https://authors.library.caltech.edu/66599/1/MNRAS-2016-Aravena-4406-20.pdf https://authors.library.caltech.edu/66599/2/1602.00652v1.pdf https://resolver.caltech.edu/CaltechAUTHORS:20160502-151110318 en eng Royal Astronomical Society https://authors.library.caltech.edu/66599/1/MNRAS-2016-Aravena-4406-20.pdf https://authors.library.caltech.edu/66599/2/1602.00652v1.pdf 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. doi:10.1093/mnras/stw275. https://resolver.caltech.edu/CaltechAUTHORS:20160502-151110318 <https://resolver.caltech.edu/CaltechAUTHORS:20160502-151110318> other Article PeerReviewed 2016 ftcaltechauth https://doi.org/10.1093/mnras/stw275 2021-11-18T18:37:34Z 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) × 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. Article in Journal/Newspaper South pole Caltech Authors (California Institute of Technology) South Pole Monthly Notices of the Royal Astronomical Society 457 4 4406 4420 |
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Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
English |
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) × 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. |
format |
Article in Journal/Newspaper |
author |
Aravena, M. Spilker, J. S. Béthermin, 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. |
spellingShingle |
Aravena, M. Spilker, J. S. Béthermin, 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 |
author_facet |
Aravena, M. Spilker, J. S. Béthermin, 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 |
Royal Astronomical Society |
publishDate |
2016 |
url |
https://authors.library.caltech.edu/66599/ https://authors.library.caltech.edu/66599/1/MNRAS-2016-Aravena-4406-20.pdf https://authors.library.caltech.edu/66599/2/1602.00652v1.pdf https://resolver.caltech.edu/CaltechAUTHORS:20160502-151110318 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://authors.library.caltech.edu/66599/1/MNRAS-2016-Aravena-4406-20.pdf https://authors.library.caltech.edu/66599/2/1602.00652v1.pdf 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. doi:10.1093/mnras/stw275. https://resolver.caltech.edu/CaltechAUTHORS:20160502-151110318 <https://resolver.caltech.edu/CaltechAUTHORS:20160502-151110318> |
op_rights |
other |
op_doi |
https://doi.org/10.1093/mnras/stw275 |
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Monthly Notices of the Royal Astronomical Society |
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457 |
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4 |
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4406 |
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4420 |
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1766202432655720448 |