Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7
We report the detection of CO(1-0) line emission in the bright, lensed star-forming galaxies SPT-S 233227-5358.5 (z=2.73) and SPT-S 053816-5030.8 (z=2.78), using the Australia Telescope Compact Array (ATCA). Both galaxies were discovered in a large-area millimeter survey with the South Pole Telescop...
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
arXiv
2013
|
Subjects: | |
Online Access: | https://dx.doi.org/10.48550/arxiv.1305.0614 https://arxiv.org/abs/1305.0614 |
id |
ftdatacite:10.48550/arxiv.1305.0614 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.48550/arxiv.1305.0614 2023-05-15T18:23:06+02:00 Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 Aravena, M. Murphy, E. J. Aguirre, J. E. Ashby, M. L. N. Benson, B. A. Bothwell, M. Brodwin, M. Carlstrom, J. E. Chapman, S. C. Crawford, T. M. de Breuck, C. Fassnacht, C. D. Gonzalez, A. H. Greve, T. R. Gullberg, B. Hezaveh, Y. Holder, G. P. Holzapfel, W. L. Keisler, R. Malkan, M. Marrone, D. P. McIntyre, V. Reichardt, C. L. Sharon, K. Spilker, J. S. Stalder, B. Stark, A. A. Vieira, J. D. Weiss, A. 2013 https://dx.doi.org/10.48550/arxiv.1305.0614 https://arxiv.org/abs/1305.0614 unknown arXiv https://dx.doi.org/10.1093/mnras/stt741 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences article-journal Article ScholarlyArticle Text 2013 ftdatacite https://doi.org/10.48550/arxiv.1305.0614 https://doi.org/10.1093/mnras/stt741 2022-04-01T13:23:02Z We report the detection of CO(1-0) line emission in the bright, lensed star-forming galaxies SPT-S 233227-5358.5 (z=2.73) and SPT-S 053816-5030.8 (z=2.78), using the Australia Telescope Compact Array (ATCA). Both galaxies were discovered in a large-area millimeter survey with the South Pole Telescope (SPT) and found to be gravitationally lensed by intervening structures. The measured CO intensities imply galaxies with molecular gas masses of (3.2 \pm 0.5)x10^10 (mu/15)^{-1}(X_CO/0.8) M_sun and (1.7 \pm 0.3)x10^10 (mu/20)^{-1}(X_CO/0.8) M_sun, and gas depletion timescales of 4.9x10^7 (X_CO/0.8) yr and 2.6x10^7 (X_CO/0.8) yr, respectively, where mu corresponds to the lens magnification and X_CO is the CO luminosity to gas mass conversion factor. In the case of SPT-S 053816-5030.8, we also obtained significant detections of the rest-frame 115.7 and 132.4 GHz radio continuum. Based on the radio to infrared spectral energy distribution and an assumed synchrotron spectral index, we find that 42 \pm 10 % and 55 \pm 13 % of the flux at rest-frame 115.7 and 132.4 GHz arise from free-free emission. We find a radio-derived intrinsic star formation rate (SFR) of 470 \pm 170 M_sun/yr, consistent within the uncertainties with the infrared estimate. Based on the morphology of this object in the source plane, the derived gas mass and the possible flattening of the radio spectral index towards low frequencies, we argue that SPT-S 053816-5030.8 exhibits properties compatible with a scaled-up local ultra-luminous infrared galaxy. : Accepted for publication in MNRAS Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
spellingShingle |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences Aravena, M. Murphy, E. J. Aguirre, J. E. Ashby, M. L. N. Benson, B. A. Bothwell, M. Brodwin, M. Carlstrom, J. E. Chapman, S. C. Crawford, T. M. de Breuck, C. Fassnacht, C. D. Gonzalez, A. H. Greve, T. R. Gullberg, B. Hezaveh, Y. Holder, G. P. Holzapfel, W. L. Keisler, R. Malkan, M. Marrone, D. P. McIntyre, V. Reichardt, C. L. Sharon, K. Spilker, J. S. Stalder, B. Stark, A. A. Vieira, J. D. Weiss, A. Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 |
topic_facet |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
description |
We report the detection of CO(1-0) line emission in the bright, lensed star-forming galaxies SPT-S 233227-5358.5 (z=2.73) and SPT-S 053816-5030.8 (z=2.78), using the Australia Telescope Compact Array (ATCA). Both galaxies were discovered in a large-area millimeter survey with the South Pole Telescope (SPT) and found to be gravitationally lensed by intervening structures. The measured CO intensities imply galaxies with molecular gas masses of (3.2 \pm 0.5)x10^10 (mu/15)^{-1}(X_CO/0.8) M_sun and (1.7 \pm 0.3)x10^10 (mu/20)^{-1}(X_CO/0.8) M_sun, and gas depletion timescales of 4.9x10^7 (X_CO/0.8) yr and 2.6x10^7 (X_CO/0.8) yr, respectively, where mu corresponds to the lens magnification and X_CO is the CO luminosity to gas mass conversion factor. In the case of SPT-S 053816-5030.8, we also obtained significant detections of the rest-frame 115.7 and 132.4 GHz radio continuum. Based on the radio to infrared spectral energy distribution and an assumed synchrotron spectral index, we find that 42 \pm 10 % and 55 \pm 13 % of the flux at rest-frame 115.7 and 132.4 GHz arise from free-free emission. We find a radio-derived intrinsic star formation rate (SFR) of 470 \pm 170 M_sun/yr, consistent within the uncertainties with the infrared estimate. Based on the morphology of this object in the source plane, the derived gas mass and the possible flattening of the radio spectral index towards low frequencies, we argue that SPT-S 053816-5030.8 exhibits properties compatible with a scaled-up local ultra-luminous infrared galaxy. : Accepted for publication in MNRAS |
format |
Text |
author |
Aravena, M. Murphy, E. J. Aguirre, J. E. Ashby, M. L. N. Benson, B. A. Bothwell, M. Brodwin, M. Carlstrom, J. E. Chapman, S. C. Crawford, T. M. de Breuck, C. Fassnacht, C. D. Gonzalez, A. H. Greve, T. R. Gullberg, B. Hezaveh, Y. Holder, G. P. Holzapfel, W. L. Keisler, R. Malkan, M. Marrone, D. P. McIntyre, V. Reichardt, C. L. Sharon, K. Spilker, J. S. Stalder, B. Stark, A. A. Vieira, J. D. Weiss, A. |
author_facet |
Aravena, M. Murphy, E. J. Aguirre, J. E. Ashby, M. L. N. Benson, B. A. Bothwell, M. Brodwin, M. Carlstrom, J. E. Chapman, S. C. Crawford, T. M. de Breuck, C. Fassnacht, C. D. Gonzalez, A. H. Greve, T. R. Gullberg, B. Hezaveh, Y. Holder, G. P. Holzapfel, W. L. Keisler, R. Malkan, M. Marrone, D. P. McIntyre, V. Reichardt, C. L. Sharon, K. Spilker, J. S. Stalder, B. Stark, A. A. Vieira, J. D. Weiss, A. |
author_sort |
Aravena, M. |
title |
Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 |
title_short |
Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 |
title_full |
Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 |
title_fullStr |
Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 |
title_full_unstemmed |
Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 |
title_sort |
large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7 |
publisher |
arXiv |
publishDate |
2013 |
url |
https://dx.doi.org/10.48550/arxiv.1305.0614 https://arxiv.org/abs/1305.0614 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1093/mnras/stt741 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1305.0614 https://doi.org/10.1093/mnras/stt741 |
_version_ |
1766202543039315968 |