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CO Multi-line Imaging of Nearby Galaxies (COMING). IX.<b>12</b>CO(<i>J</i> = 2–1)/<b>12</b>CO(<i>J</i> = 1–0) line ratio on kiloparsec scales
While molecular gas mass is usually derived from $^{12}$CO($J$=1-0) - the most fundamental line to explore molecular gas - it is often derived from $^{12}$CO($J$=2-1) assuming a constant $^{12}$CO($J$=2-1)/$^{12}$CO($J$=1-0) line ratio ($R_{2/1}$). We present variations of $R_{2/1}$ and effects of the assumption that $R_{2/1}$ is a constant in 24 nearby …