title: Molecular abundances in the Sagittarius A molecular cloud.
abstract: We have obtained column densities for HCO+, HCO, HCS+, C3H2, HC5N, SiO, OCS, HCOOH, CH3CH2OH, and CH3CCH toward Sgr A.  The fractional abundance of SiO relative to molecular hydrogen in Sgr A is comparable to that for the Orion plateau, approximately 10(-7)-10(-8), which may be a typical value for hot clouds.  The abundances of HCO, CH3CH2OH and CH3CCH all appear to be enhanced relative to other molecular clouds such as Sgr B2.
authors.affiliation: Korea Astronomy Observatory, Daejon, Korea.
authors.forename: Y C
authors.initials: YC
authors.lastname: Minh
authors.forename: W M
authors.initials: WM
authors.lastname: Irvine
authors.forename: P
authors.initials: P
authors.lastname: Friberg
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D055598:Chemical Phenomena; D002621:Chemistry; D018559:Exobiology; D005118:Extraterrestrial Environment; D006838:Hydrocarbons / Q000032:analysis*; D008433:Mathematics; D008958:Models, Molecular; D010087:Oxides / Q000032:analysis; D012825:Silicon / Q000032:analysis*; D017655:Silicon Compounds / Q000032:analysis; D016082:Solar System; D013057:Spectrum Analysis
chemical_list: D006838:Hydrocarbons; D010087:Oxides; D017655:Silicon Compounds; D012825:Silicon