Prefer a chat interface with context about you and your work?
PHYSICAL CONDITIONS IN MOLECULAR CLOUDS IN THE ARM AND INTERARM REGIONS OF M51
We report systematic variations in the emission line ratio of the CO J = 2โ1 and J = 1โ0 transitions (R2โ1/1โ0) in the grand-design spiral galaxy M51. The R2โ1/1โ0 ratio shows clear evidence for the evolution of molecular gas from the upstream interarm regions into the spiral arms and back โฆ