Resolved low-J ${}^{12}$CO excitation at 190 parsec resolution across NGC 2903 and NGC 3627

J. S. den Brok, A. K. Leroy, A. Usero +14

The low-$J$ rotational transitions of ${}^{12}$CO are commonly used to trace the distribution of molecular gas in galaxies. Their ratios are sensitive to excitation and physical cond…