Fig. 28

Column-density maps of the Polaris and Aquila regions derived from Herschel dust emission data previously analyzed by André et al. (2010), Schneider et al. (2013), and Könyves et al. (2015). As the map of Polaris includes the celestial pole, coordinates are given relative to 3h 28m 16.0s, 88°34′ 32.0″ (J2000). One degree in the map corresponds to 2.6 pc in Polaris and 4.5 pc in Aquila. We specify the column density in terms of the visual extinction using the standard factor NH ∕AV= 1.87 × 1021 cm−2 (Bohlin et al. 1978).
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