G331.512–0.103: An Interstellar Laboratory for Molecular Synthesis. I. The Ortho-to-para Ratios forCH 3 OH and CH 3 CN

5 years ago

G331.512–0.103: An Interstellar Laboratory for Molecular Synthesis. I. The Ortho-to-para Ratios for CH 3 OH and CH 3 CN

Lars Åke-Nyman, Manuel Merello, Jacques R. D. Lépine, Nicolas U. Duronea, Diana R. G. Gama, Edgar Mendoza, Nicolas Reyes, Leonardo Bronfman, Carlos Hervías-Caimapo, Ricardo Finger

Spectral line surveys reveal rich molecular reservoirs in G331.512–0.103, a compact radio source in the center of an energetic molecular outflow. In this first work, we analyze the physical conditions of the source by means of CH 3 OH and CH 3 CN. The observations were performed with the APEX Telescope. Six different system configurations were defined to cover most of the band within (292–356) GHz; as a consequence, we detected a forest of lines toward the central core. A total of 70 lines of A / E –CH 3 OH and A / E –CH 3 CN were analyzed, including torsionally excited transitions of CH 3 OH ( ##IMG## [http://ej.iop.org/images/0004-637X/853/2/152/apjaaa1ecieqn1.gif] {${\nu }_{t}=1$} ). In a search for all the isotopologues, we identified transitions of 13 CH 3 OH. The physical conditions were derived considering collisional and radiative processes. We found common temperatu...

Publisher URL: http://iopscience.iop.org/0004-637X/853/2/152

DOI: 10.3847/1538-4357/aaa1ec