a) Column density map of the Aquila region derived from Herschel Gould Belt survey (HGBS) data (André et al. 2010; Könyves et al. 2015) at an angular resolution of 18.2″ and in units of AV. b) FUV field strength map derived from HGBS 70 μm and 100 μm data smoothed to an angular resolution of 18.2″ in Habing units, and integrated intensity maps of c) HCN(1–0); d) HCO+(1–0); e) H13CN(1–0); f) H13CO+(1–0) in units of K km s-1 (TMB). The angular resolutions of the HCN, HCO+, H13CN, and H13CO+ maps are 40″, 40″, 40″, and 50″, respectively. In each panel, a green polygon outlines the field observed in molecular lines. The HCN and H13CN integrated intensity includes all components of the hyperfine structure (HFS). The white contour in panel a and the magenta dotted contours in panels e and f show the AV = 8 level obtained after smoothing the Herschel column density map to 40″ resolution. In panel b, green open circles indicate the positions of the Class II objects identified by Dunham et al. (2015). In panels e and f, the magenta solid contour indicates the rough AV column density level above which significant line emission is detected, i.e., AV = 20 for H13CN (1–0) and AV = 16 for H13CO+ (1–0).
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