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A SCUBA-2 selected Herschel-SPIRE dropout and the nature of this population

Greenslade, J, Aguilar, E, Clements, D L, Dannerbauer, H, Cheng, T, Petitpas, G, Yang, C, Messias, H, Oteo, I, Farrah, D, Michalowski, M J, Fournon, I Pérez, Aretxaga, I, Yun, M S, Eales, S ORCID:, Dunne, L ORCID:, Cooray, A, Andreani, P, Hughes, D H, Velázquez, M, Sánchez-Argüelles, D and Ponthieu, N 2019. A SCUBA-2 selected Herschel-SPIRE dropout and the nature of this population. Monthly Notices of the Royal Astronomical Society 490 (4) , pp. 5317-5334. 10.1093/mnras/stz2850

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Dusty star-forming galaxies (DSFGs) detected at z > 4 provide important examples of the first generations of massive galaxies. However, few examples with spectroscopic confirmation are currently known, with Hershel struggling to detect significant numbers of z > 6 DSFGs. NGP6_D1 is a bright 850 μ μ m source (12.3 ± 2.5 mJy) with no counterparts at shorter wavelengths (a SPIRE dropout). Interferometric observations confirm it is a single source, with no evidence for any optical or NIR emission, or nearby likely foreground lensing sources. No >3σ detected lines are seen in both LMT Redshift Search Receiver and IRAM 30 m EMIR spectra of NGP6_D1 across 32 GHz of bandwidth despite reaching detection limits of ∼1mJy/500 km s −1 ∼1mJy/500km s−1 ⁠, so the redshift remains unknown. Template fitting suggests that NGP6_D1 is most likely between z = 5.8 and 8.3. SED analysis finds that NGP6_D1 is a ULIRG, with a dust mass ∼108–109 M⊙ and a star-formation rate of ∼500 M⊙ yr−1. We place upper limits on the gas mass of NGP6_D1 of MH2 <(1.1 ± 3.5) × 1011 M⊙, consistent with a gas-to-dust ratio of ∼100–1000. We discuss the nature of NGP6_D1 in the context of the broader sub-mm population, and find that comparable SPIRE dropouts account for ∼20 per cent of all SCUBA-2 detected sources, but with a similar flux density distribution to the general population.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 6 December 2019
Date of Acceptance: 4 October 2019
Last Modified: 05 May 2023 07:05

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