The formation of ethylene glycol and other complex organic molecules in star-forming regions

摘要: We study the molecular abundance and spatial distribution of simplest sugar alcohol, ethylene glycol (EG), glycoladehyde (GA), other chemically related complex organic species towards massive star-forming region G31.41+0.31. have analyzed multiple single dish interferometric data, obtained excitation temperatures column densities using an LTE analysis. reported for first time presence EG G31.41+0.31, we also detected transitions molecules such as GA, methyl formate (MF), dimethyl ether (DME) ethanol (ET). The high angular resolution images show that emission is very compact, peaking maximum continuum. These observations suggest low molecules, like or are good probes gas located closer to forming stars. Our analysis confirms more abundant than GA in previously observed interstellar regions. Comparing different regions find evidence increase EG/GA ratio with luminosity source. DME/MF EG/ET ratios nearly constant luminosity. found pairs isomers GA/MF ET/DME decrease sources. most likely explanation behavior these formed by chemical formation routes not directly linked; although warm-up timescales effects destruction efficiencies phase cannot be ruled out. route combination two CH$_{2}$OH radicals on dust grains. favor via solid-phase dimerization formyl radical HCO, a link between MF DME.