Formation of complex organic molecules in cold objects: the role of gas-phase reactions

摘要: While astrochemical models are successful in reproducing many of the observed interstellar species, they have been struggling to explain abundances complex organic molecules. Current tend privilege grain surface over gas phase chemistry their formation. One key assumption those is that radicals trapped mantles gain mobility and react on lukewarm (>30 K) dust grains. Thus, recent detections methyl formate (MF) dimethyl ether (DME) cold objects represent a challenge may clarify respective role chemistry. We propose here new model form DME MF with reactions environments, where precursor via an efficient reaction overlooked by previous models. Furthermore, methoxy, DME, also synthetized from methanol, which desorbed non-thermal process ices. Our reproduces fairy well observations towards L1544. It explains, natural way, correlation between MF. conclude major actors formation MF, methoxy gas. This challenges exclusive grain-surface favours combined grain-gas