[C II] emission in z ~ 6 strongly lensed, star-forming galaxies
The far-infrared fine-structure line [C ii] at 1900.5 GHz is known to be one of the brightest cooling lines in local galaxies, and therefore it has been suggested to be an efficient tracer for star formation in very high redshift galaxies. However, recent results for galaxies at z > 6 have yielde...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Published: |
Oxford
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/23388 |
| _version_ | 1848751136742309888 |
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| author | Knudsen, K. Richard, J. Kneib, J. Jauzac, M. Clement, B. Drouart, Guillaume Egami, E. Lindroos, L. |
| author_facet | Knudsen, K. Richard, J. Kneib, J. Jauzac, M. Clement, B. Drouart, Guillaume Egami, E. Lindroos, L. |
| author_sort | Knudsen, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The far-infrared fine-structure line [C ii] at 1900.5 GHz is known to be one of the brightest cooling lines in local galaxies, and therefore it has been suggested to be an efficient tracer for star formation in very high redshift galaxies. However, recent results for galaxies at z > 6 have yielded numerous non-detections in star-forming galaxies, except for quasars and submillimetre galaxies. We report the results of ALMA observations of two lensed, star-forming galaxies at z = 6.029 and z = 6.703. The galaxy A383-5.1 (star formation rate [SFR] of 3.2 M☉ yr−1 and magnification of μ = 11.4 ± 1.9) shows a line detection with L[CII]=8.9×106 L L☉, making it the lowest L[CII] detection at z > 6. For MS0451-H (SFR = 0.4 M☉ yr−1 and μ = 100 ± 20) we provide an upper limit of L[CII]<3×105 L☉, which is 1 dex below the local SFR–L[CII] relations. The results are consistent with predictions for low-metallicity galaxies at z > 6; however, other effects could also play a role in terms of decreasing L[CII]. The detection of A383-5.1 is encouraging and suggests that detections are possible, but much fainter than initially predicted. |
| first_indexed | 2025-11-14T07:47:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-23388 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:47:56Z |
| publishDate | 2016 |
| publisher | Oxford |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-233882018-03-29T09:06:48Z [C II] emission in z ~ 6 strongly lensed, star-forming galaxies Knudsen, K. Richard, J. Kneib, J. Jauzac, M. Clement, B. Drouart, Guillaume Egami, E. Lindroos, L. The far-infrared fine-structure line [C ii] at 1900.5 GHz is known to be one of the brightest cooling lines in local galaxies, and therefore it has been suggested to be an efficient tracer for star formation in very high redshift galaxies. However, recent results for galaxies at z > 6 have yielded numerous non-detections in star-forming galaxies, except for quasars and submillimetre galaxies. We report the results of ALMA observations of two lensed, star-forming galaxies at z = 6.029 and z = 6.703. The galaxy A383-5.1 (star formation rate [SFR] of 3.2 M☉ yr−1 and magnification of μ = 11.4 ± 1.9) shows a line detection with L[CII]=8.9×106 L L☉, making it the lowest L[CII] detection at z > 6. For MS0451-H (SFR = 0.4 M☉ yr−1 and μ = 100 ± 20) we provide an upper limit of L[CII]<3×105 L☉, which is 1 dex below the local SFR–L[CII] relations. The results are consistent with predictions for low-metallicity galaxies at z > 6; however, other effects could also play a role in terms of decreasing L[CII]. The detection of A383-5.1 is encouraging and suggests that detections are possible, but much fainter than initially predicted. 2016 Journal Article http://hdl.handle.net/20.500.11937/23388 10.1093/mnrasl/slw114 Oxford restricted |
| spellingShingle | Knudsen, K. Richard, J. Kneib, J. Jauzac, M. Clement, B. Drouart, Guillaume Egami, E. Lindroos, L. [C II] emission in z ~ 6 strongly lensed, star-forming galaxies |
| title | [C II] emission in z ~ 6 strongly lensed, star-forming galaxies |
| title_full | [C II] emission in z ~ 6 strongly lensed, star-forming galaxies |
| title_fullStr | [C II] emission in z ~ 6 strongly lensed, star-forming galaxies |
| title_full_unstemmed | [C II] emission in z ~ 6 strongly lensed, star-forming galaxies |
| title_short | [C II] emission in z ~ 6 strongly lensed, star-forming galaxies |
| title_sort | [c ii] emission in z ~ 6 strongly lensed, star-forming galaxies |
| url | http://hdl.handle.net/20.500.11937/23388 |