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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2019

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

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J. Greenslade
  • Function : Author
E. Aguilar
  • Function : Author
D. L. Clements
  • Function : Author
H. Dannerbauer
  • Function : Author
T. Cheng
  • Function : Author
G. Petitpas
  • Function : Author
C. Yang
  • Function : Author
H. Messias
  • Function : Author
I. Oteo
  • Function : Author
D. Farrah
  • Function : Author
M. J. Michałowski
  • Function : Author
I. Pérez Fournon
  • Function : Author
I. Aretxaga
  • Function : Author
M. S. Yun
  • Function : Author
S. Eales
  • Function : Author
L. Dunne
  • Function : Author
A. Cooray
  • Function : Author
P. Andreani
  • Function : Author
D. H. Hughes
  • Function : Author
M. Velázquez
  • Function : Author
D. Sánchez-Argüelles
  • Function : Author

Abstract

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 μm 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 ∼ 1 mJy/500 km 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.
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Dates and versions

insu-03699402 , version 1 (23-06-2022)

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J. Greenslade, E. Aguilar, D. L. Clements, H. Dannerbauer, T. Cheng, et al.. A SCUBA-2 selected Herschel-SPIRE dropout and the nature of this population. Monthly Notices of the Royal Astronomical Society, 2019, 490, pp.5317-5334. ⟨10.1093/mnras/stz2850⟩. ⟨insu-03699402⟩
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