Do Unusually Cold Starburst Galaxies Exist? A Case Study
We report observations of CO( J = 9 → 8) and OH ^+ ( N = 1 → 0) toward the four millimeter-selected lensed starburst galaxies SPT 2354−58, 0150−59, 0314−44, and 0452−50, using the Atacama Large Millimeter/submillimeter Array (ALMA) Atacama Compact Array, as part of a larger study of OH ^+ in the ear...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ada4ac |
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| author | Dominik A. Riechers |
| author_facet | Dominik A. Riechers |
| author_sort | Dominik A. Riechers |
| collection | DOAJ |
| description | We report observations of CO( J = 9 → 8) and OH ^+ ( N = 1 → 0) toward the four millimeter-selected lensed starburst galaxies SPT 2354−58, 0150−59, 0314−44, and 0452−50, using the Atacama Large Millimeter/submillimeter Array (ALMA) Atacama Compact Array, as part of a larger study of OH ^+ in the early Universe. In this work, we use these observations for the main purpose of spectroscopic redshift measurements. For all sources except SPT 0452−50, we confirm the previously reported most likely redshifts, and we find typical CO and OH ^+ properties for massive starbursts. For SPT 0452−50, we rule out the previously reported value of z = 2.0105, measuring a firm redshift of z = 5.0160 based on [O i ], [C ii ], H _2 O, and CO emission instead when adding in ancillary ALMA data. Previously, SPT 0452−50 was considered an outlier in relations between dust temperature, far-infrared luminosity, and redshift, which may have hinted at an unusually cold starburst with a dust temperature of only T _dust = (21 ± 2) K. Instead, our new measurements suggest it to be among highly luminous massive dusty starbursts at z > 5, with rather typical properties within that population. We find a revised dust temperature of T _dust = (76.2 ± 2.5) K, and an updated lensing-corrected far-infrared luminosity (42.5–122.5 μ m) of (2.35 ${}_{-0.08}^{+0.09}$ ) × 10 ^13 L _⊙ , i.e., about an order of magnitude higher than previously reported. We thus do not find evidence for the existence of unusually cold starburst galaxies in the early Universe that were missed by previous selection techniques. |
| format | Article |
| id | doaj-art-a3e8942751724ee4b98aa10544500527 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-a3e8942751724ee4b98aa105445005272025-02-04T05:06:03ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198015910.3847/1538-4357/ada4acDo Unusually Cold Starburst Galaxies Exist? A Case StudyDominik A. Riechers0https://orcid.org/0000-0001-9585-1462Institut für Astrophysik, Universität zu Köln , Zülpicher Straße 77, D-50937 Köln, Germany ; riechers@ph1.uni-koeln.deWe report observations of CO( J = 9 → 8) and OH ^+ ( N = 1 → 0) toward the four millimeter-selected lensed starburst galaxies SPT 2354−58, 0150−59, 0314−44, and 0452−50, using the Atacama Large Millimeter/submillimeter Array (ALMA) Atacama Compact Array, as part of a larger study of OH ^+ in the early Universe. In this work, we use these observations for the main purpose of spectroscopic redshift measurements. For all sources except SPT 0452−50, we confirm the previously reported most likely redshifts, and we find typical CO and OH ^+ properties for massive starbursts. For SPT 0452−50, we rule out the previously reported value of z = 2.0105, measuring a firm redshift of z = 5.0160 based on [O i ], [C ii ], H _2 O, and CO emission instead when adding in ancillary ALMA data. Previously, SPT 0452−50 was considered an outlier in relations between dust temperature, far-infrared luminosity, and redshift, which may have hinted at an unusually cold starburst with a dust temperature of only T _dust = (21 ± 2) K. Instead, our new measurements suggest it to be among highly luminous massive dusty starbursts at z > 5, with rather typical properties within that population. We find a revised dust temperature of T _dust = (76.2 ± 2.5) K, and an updated lensing-corrected far-infrared luminosity (42.5–122.5 μ m) of (2.35 ${}_{-0.08}^{+0.09}$ ) × 10 ^13 L _⊙ , i.e., about an order of magnitude higher than previously reported. We thus do not find evidence for the existence of unusually cold starburst galaxies in the early Universe that were missed by previous selection techniques.https://doi.org/10.3847/1538-4357/ada4acActive galaxiesGalaxy evolutionStarburst galaxiesHigh-redshift galaxiesInfrared excess galaxiesInterstellar line emission |
| spellingShingle | Dominik A. Riechers Do Unusually Cold Starburst Galaxies Exist? A Case Study The Astrophysical Journal Active galaxies Galaxy evolution Starburst galaxies High-redshift galaxies Infrared excess galaxies Interstellar line emission |
| title | Do Unusually Cold Starburst Galaxies Exist? A Case Study |
| title_full | Do Unusually Cold Starburst Galaxies Exist? A Case Study |
| title_fullStr | Do Unusually Cold Starburst Galaxies Exist? A Case Study |
| title_full_unstemmed | Do Unusually Cold Starburst Galaxies Exist? A Case Study |
| title_short | Do Unusually Cold Starburst Galaxies Exist? A Case Study |
| title_sort | do unusually cold starburst galaxies exist a case study |
| topic | Active galaxies Galaxy evolution Starburst galaxies High-redshift galaxies Infrared excess galaxies Interstellar line emission |
| url | https://doi.org/10.3847/1538-4357/ada4ac |
| work_keys_str_mv | AT dominikariechers dounusuallycoldstarburstgalaxiesexistacasestudy |