Variation of star formation rate normalized by area, ΣSFR with a) ΣH2, b) ΣH2/τorb, c) ΣH2/τff, and d) ΣH2/τcross for resolved ATLASGAL clumps with measured distances. Points correspond to star forming ATLASGAL clumps (black circles and red error bars), 2σ upper limits to ΣSFR for non-star forming ATLASGAL clumps (black crosses) Lada et al. (2012; green), Evans et al. (2014; magenta), and Gutermuth et al. (2009; blue). As discussed in the text, the black circles are lower limits to the true star formation rates. In a) the lines correspond to Kennicutt (1998; dotted), Bigiel et al. (2008; dashed), Wu et al. (2005; solid). In b) and c), the dashed lines correspond respectively to the global star formation law with ϵorb = 0.1 and 1.0 and the volumetric star formation law with ϵff = 0.001 and 0.01. In d), the dotted line is an error-weighted fit to the star forming ATLASGAL clumps.
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