title: Observations of C3H2 (2(12) - 1(01)) toward the Sagittarius A molecular cloud.
abstract: We have mapped the C3H2 2(12)-1(01) transition line toward the Sgr A molecular cloud on a 1' grid spacing and derived C3H2 column densities of 3 approximately 7 x 10(14) cm-2 for molecular clouds of Sgr A. The fractional abundances of C3H2 relative to H2 are obtained to be 3 approximately 6 x 10(-9), which are slightly lower than that for the cold dark cloud TMC-1 but are enhanced by factors of 5-60 compared to those for Sgr B2 and the Orion extended ridge. We also estimate from the C3H2 column densities total masses of approximately 10(6) M(solar) for two clouds (M - 0.13-0.08 and M - 0.02-0.07), which are thought to be close to the virial equilibrium. We suggest that the large abundance of C3H2 in Sgr A may be partly due to the activities of the Galactic center.
authors.affiliation: Department of Earth Science, Pusan National University.
authors.forename: C W
authors.initials: CW
authors.lastname: Lee
authors.forename: Y C
authors.initials: YC
authors.lastname: Minh
authors.forename: W M
authors.initials: WM
authors.lastname: Irvine
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D005118:Extraterrestrial Environment; D005740:Gases / Q000032:analysis* / Q000737:chemistry; D006838:Hydrocarbons / Q000032:analysis* / Q000737:chemistry; D013057:Spectrum Analysis
chemical_list: D005740:Gases; D006838:Hydrocarbons