A systematic TMRT observational study of Galactic ${}^{12}$C/${}^{13}$C ratios from Formaldehyde

Y. T. Yan, J. S. Zhang, C. Henkel +10

We present observations of the C-band $1_{10}-1_{11}$ (4.8 GHz) and Ku-band $2_{11}-2_{12}$ (14.5 GHz) K-doublet lines of H${}_2$CO and the C-band $1_{10}-1_{11}$ (4.6 GHz) line of H…