Comparing SCUBA-2 and ALMA Selections of Faint DSFGs in Abell 2744
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arXiv
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| Natura: | Preprint |
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2023
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| author | McKay, S. J. Barger, A. J. Cowie, L. L. |
| author_facet | McKay, S. J. Barger, A. J. Cowie, L. L. |
| contents | We make a comparison of deep SCUBA-2 450 $μ$m and 850 $μ$m imaging on the massive lensing cluster field Abell 2744 with Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm data. Our primary goal is to assess how effective the wider-field SCUBA-2 sample, in combination with red JWST priors, is for finding faint dusty star-forming galaxies (DSFGs) compared to the much more expensive mosaicked ALMA observations. We cross-match our previously reported direct ($>5σ$) SCUBA-2 sample and red JWST NIRCam prior-selected ($>3σ$) SCUBA-2 sample to direct ALMA sources from the DUALZ survey. We find that roughly 95% are confirmed by ALMA. The red priors also allow us to probe deeper in the ALMA image. Next, by measuring the 450 $μ$m and 850 $μ$m properties of the full ALMA sample, we show that 46/69 of the ALMA sources are detected at 850 $μ$m and 24/69 are detected at 450 $μ$m in the SCUBA-2 images, with a total detection fraction of nearly 75%. All of the robust ($>5σ$) ALMA sources that are not detected in at least one SCUBA-2 band lie at 1.2 mm fluxes $\lesssim$ 0.6 mJy and are undetected primarily due to the higher SCUBA-2 flux limits. We also find that the SCUBA-2 detection fraction drops slightly beyond $z=3$, which we attribute to the increasing 1.2 mm to 850 $μ$m and 1.2 mm to 450 $μ$m flux ratios combined with the ALMA selection. The results emphasize the power of combining SCUBA-2 data with JWST colors to map the faint DSFG population. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_17167 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Comparing SCUBA-2 and ALMA Selections of Faint DSFGs in Abell 2744 McKay, S. J. Barger, A. J. Cowie, L. L. Astrophysics of Galaxies We make a comparison of deep SCUBA-2 450 $μ$m and 850 $μ$m imaging on the massive lensing cluster field Abell 2744 with Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm data. Our primary goal is to assess how effective the wider-field SCUBA-2 sample, in combination with red JWST priors, is for finding faint dusty star-forming galaxies (DSFGs) compared to the much more expensive mosaicked ALMA observations. We cross-match our previously reported direct ($>5σ$) SCUBA-2 sample and red JWST NIRCam prior-selected ($>3σ$) SCUBA-2 sample to direct ALMA sources from the DUALZ survey. We find that roughly 95% are confirmed by ALMA. The red priors also allow us to probe deeper in the ALMA image. Next, by measuring the 450 $μ$m and 850 $μ$m properties of the full ALMA sample, we show that 46/69 of the ALMA sources are detected at 850 $μ$m and 24/69 are detected at 450 $μ$m in the SCUBA-2 images, with a total detection fraction of nearly 75%. All of the robust ($>5σ$) ALMA sources that are not detected in at least one SCUBA-2 band lie at 1.2 mm fluxes $\lesssim$ 0.6 mJy and are undetected primarily due to the higher SCUBA-2 flux limits. We also find that the SCUBA-2 detection fraction drops slightly beyond $z=3$, which we attribute to the increasing 1.2 mm to 850 $μ$m and 1.2 mm to 450 $μ$m flux ratios combined with the ALMA selection. The results emphasize the power of combining SCUBA-2 data with JWST colors to map the faint DSFG population. |
| title | Comparing SCUBA-2 and ALMA Selections of Faint DSFGs in Abell 2744 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2311.17167 |