Figure 1. Emission lines detected in the AS2UDS Band 7 datacubes, ranked by their integrated S/N. These are labeled with the SMG ID, the S/N and the corresponding redshift if the line is [C II] 157.74 μm. We find 10 line emitters with integrated S/N ranging from S/N=7.2–17.3 in the 695 SMGs with S870 μm1 mJy. Fluxes shown are not primary beam-corrected (typically a correction of <10%) and are measured at the position of peak flux within the 0.5 arcsec tapered dirty cubes. The gray lines show the unbinned data. The black histogram shows the data binned to 100 km s−1. The red lines show the Gaussian fit to the detected emission line and continuum level. We note that AS2UDS.0243.0 and AS2UDS.0535.0 have photometric properties that suggest the line we detect is CO(8–7) or CO(5–4), respectively, corresponding to zCO<2. Further observations are needed to confirm the nature of these emission lines.
...read more