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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2310.17701 |
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| _version_ | 1866914765230571520 |
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| author | Matthews, A. M Kelson, D. D. Newman, A. B. Camilo, F. Condon, J. J. Cotton, W. D. Dickinson, M. Jarrett, T. H. Lacy, M. |
| author_facet | Matthews, A. M Kelson, D. D. Newman, A. B. Camilo, F. Condon, J. J. Cotton, W. D. Dickinson, M. Jarrett, T. H. Lacy, M. |
| contents | We present the initial sample of redshifts for 3,839 galaxies in the MeerKAT DEEP2 field -- the deepest $\sim$1.4\,GHz radio field yet observed. Using a spectrophotometric technique combining coarse optical spectra with broadband photometry, we obtain redshifts with $σ_z \leq 0.01(1+z)$. The resulting radio luminosity functions between $0.2<z<1.3$ from our sample of 3,839 individual galaxies are in remarkable agreement with those inferred from modeling radio source counts, confirming an excess in radio-based SFRD$(z$) measurements at late times compared to those from the UV--IR. Several sources of systematic error are discussed -- with most having the potential of exacerbating the discrepancy -- with the conclusion that significant work remains to have confidence in a full accounting of the star formation budget of the universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_17701 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Confirmation of a Substantial Discrepancy between Radio and UV--IR Measures of the Star Formation Rate Density at 0.2 < z < 1.3 Matthews, A. M Kelson, D. D. Newman, A. B. Camilo, F. Condon, J. J. Cotton, W. D. Dickinson, M. Jarrett, T. H. Lacy, M. Astrophysics of Galaxies We present the initial sample of redshifts for 3,839 galaxies in the MeerKAT DEEP2 field -- the deepest $\sim$1.4\,GHz radio field yet observed. Using a spectrophotometric technique combining coarse optical spectra with broadband photometry, we obtain redshifts with $σ_z \leq 0.01(1+z)$. The resulting radio luminosity functions between $0.2<z<1.3$ from our sample of 3,839 individual galaxies are in remarkable agreement with those inferred from modeling radio source counts, confirming an excess in radio-based SFRD$(z$) measurements at late times compared to those from the UV--IR. Several sources of systematic error are discussed -- with most having the potential of exacerbating the discrepancy -- with the conclusion that significant work remains to have confidence in a full accounting of the star formation budget of the universe. |
| title | Confirmation of a Substantial Discrepancy between Radio and UV--IR Measures of the Star Formation Rate Density at 0.2 < z < 1.3 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2310.17701 |