Comparison of the molecular gas mass and SFR surface density estimated in M 83. Points with error bars are the values derived using the Herschel SPIRE FTS data. Blue points indicate the values estimated with ICO(1 − 0) (XCO = 2 × 1020 cm-2 (K km s-1)-1) when there is no available data from FTS observation. The 2.35 Gyr, which is the gas depletion time found within 30 nearby spatially resolved spiral galaxies in Bigiel et al. (2011), is shown as the solid line, with its 1σ scatter marked by the red dash-dotted lines.
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