A tentative emission line at z=5.8 from a 3mm-selected galaxy

Abstract

I report a tentative ($\sim 4\sigma$) emission line at $\nu =100.84$GHz from "COS-3mm-1'", a 3mm-selected galaxy reported by Williams et al. 2019 that is undetected at optical and near infrared wavelengths. The line was found in the ALMA Science Archive after re-processing ALMA band 3 observations targeting a different source. Assuming the line corresponds to the $\mathrm{CO}(6\to 5)$ transition, this tentative detection implies a spectroscopic redshift of $z=5.857$, in agreement with the galaxy's redshift constraints from multi-wavelength photometry. This would make this object the highest redshift 3mm-selected galaxy and one of the highest redshift dusty star-forming galaxies known to-date. Here, I report the characteristics of this tentative detection and the physical properties that can be inferred assuming the line is real. Finally, I advocate for follow-up observations to corroborate this identification and to confirm the high-redshift nature of this optically-dark dusty star-forming galaxy.

4 pages, 1 figure

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Cited by in corpus (2)

• A new estimate of the cosmic star formation density from a radio-selected sample, and the contribution of $H$-dark galaxies at $z\ge 3$
• Characterization of Two 2mm-detected Optically-Obscured Dusty Star-Forming Galaxies