The cold interstellar medium of a normal sub-L^⋆ galaxy at the end of reionization

We present the results of a  60-hr observational campaign with ALMA targeting a spectroscopically confirmed and lensed sub-L^⋆ galaxy at z=6.07, identified during the ALMA Lensing Cluster Survey (ALCS). We sample the dust continuum emission from rest frame 90 to 370 μm at six different frequencies and set constraining upper limits on the molecular gas line emission and content via CO(7-6) and [CI](2-1) for two lensed images with μ≳20. Complementing these sub-mm observations with deep optical and near-IR photometry and spectroscopy with JWST, we find this galaxy to form stars at a rate of SFR 7 Msun/yr,  50-70 consistent with what is expected for a M_⋆ 7.5×10^8 Msun object by extrapolating the M_⋆-obscured SFR fraction relation at z<2.5 and with observations at 5更多