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I report a tentative ($\sim4\sigma$) emission line at $\nu=100.84\,$GHz from"COS-3mm-1'", a 3mm-selected galaxy reported by Williams et al. 2019 that isundetected at optical and near infrared wavelengths. The line was found in theALMA Science Archive after re-processing ALMA band 3 observations targeting adifferent source. Assuming the line corresponds to the $\rm CO(6\to5)$transition, this tentative detection implies a spectroscopic redshift of$z=5.857$, in agreement with the galaxy's redshift constraints frommulti-wavelength photometry. This would make this object the highest redshift3mm-selected galaxy and one of the highest redshift dusty star-forming galaxiesknown to-date. Here, I report the characteristics of this tentative detectionand the physical properties that can be inferred assuming the line is real.Finally, I advocate for follow-up observations to corroborate thisidentification and to confirm the high-redshift nature of this optically-darkdusty star-forming galaxy.

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