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Fig. 1

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Locations of 72 selected molecular clouds in the far outer Galaxy (marked by cyan circles). Locations of the high-mass starforming regions associated with the Outer Arm are denoted by white squares, with crossing white lines indicating distance uncertainties (Reid et al. 2014).The dashed white line traces a log spiral with a mean pitch angle of 12° that was fit to the Scutum–Centaurus arm. The dashed red line traces the log-periodic spiral that is fitting results to clouds (120° < l < 150°) detected by Sun et al. (2015). The solid cyan line traces the log-periodic spiral fitting results to clouds detected by Dame & Thaddeus (2011) and Sun et al. (2015). Image adapted from Sun et al. (2015).

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