Organic Molecules in the Galactic Center. Hot Core Chemistry without Hot Cores

摘要: We study the origin of large abundances complex organic molecules in Galactic center (GC). carried out a systematic CH3OH, C2H5OH, (CH3)2O, HCOOCH3, HCOOH, CH3COOH, H2CO, and CS toward 40 GC molecular clouds. Using LTE approximation, we derived physical properties clouds molecules.The CH3OH abundance between varies by nearly two orders magnitude from 2.4x10^{-8} to 1.1x10^{-6}. The other relative that is basically independent abundance, with variations only factor 4-8. are compared those measured hot cores corinos, which these also abundant. find both ratios similar found However, corinos show different than observed rather constant all suggests ejected grain mantles shocks. Frequent (similar 10^{5}years) shocks velocities >6km/s required explain high gas phase uniform indicate average composition kinds regions. Sickle Thermal Radio Arches, affected UV radiation, due differentially photodissociation molecules.