METHANOL IN THE STARLESS CORE, TAURUS MOLECULAR CLOUD-1

摘要: To explore the formation mechanisms of gas phase CH3OH in cold starless cores, we have conducted high spectral resolution observations toward cyanopolyyne peak Taurus Molecular Cloud-1 (TMC-1 CP) with IRAM 30 m telescope, Green Bank Telescope, and Nobeyama 45 telescope. The lines TMC-1 CP are found to a double-peaked profile separated by 0.5 km s−1. Since is observed for 13CH3OH, it not due optical depth and/or self-absorption effects. line much different from those C34S, C3S, HC7N this source. H2 densities emitting region blueshifted redshifted components derived be (1.7 ± 0.5) × 104 cm−3 (4.3 1.2) cm−3, respectively. These similar or slightly lower than other molecules. results suggest chemical differentiation between molecules, which has indeed been confirmed mapping C34S lines. consistent general idea that formed on dust grains liberated into non-thermal desorption. grain-surface origin further CH3OH/13CH3OH ratio. Weak shocks caused accreting diffuse filament, photoevaporation cosmic-ray induced UV radiation, desorption excess reaction energy discussed mechanisms.