Protostellar Interferometric Line Survey of the Cygnus X region (PILS-Cygnus)

Context. Complex organic molecules (COMs) are commonly detected in and near star-forming regions. However, the dominant process release of these COMs from icy grains – where they predominately form to gas phase is still an open question. Aims. We investigate origin COM emission a high-mass protostellar source, CygX-N30 MM1, through high-angular-resolution interferometric observations over continuous broad frequency range. Methods. used 32 GHz Submillimeter Array with coverage 329 361 at angular resolution ~1″ do line survey obtain chemical inventory source. The range was determine column densities excitation temperatures for COMs. also mapped out intensity distribution different species. Results. identified approximately 400 lines that can be attributed 29 molecular species their isotopologues. find peak along linear gradient, coincides axis red- blueshifted H 2 CO CS emission. Chemical differentiation this O-bearing peaking towards one component system N- S-bearing other. gradient offset but parallel two continuum sources. inferred compared other sources abundant. Only deuterated molecule detected, HDO, while upper limit CH DOH derived, leading D/H ratio <0.1%. Conclusions. conclude observed probably combination young stellar accretion infalling material onto disc-like structure surrounding protostar located close This disc associated species, S- N-bearing on hand core, which slightly more evolved than system. low likely reflects pre-stellar formed ices warm (~30 K), deuterium fractionation would have been inefficient. results presented here demonstrate importance good high when disentangling