Fig. 2.
Integrated intensity maps of the (a) C18O and (b) N2H+ emission lines. The velocity ranges used for the integration are (a) 15.0 ≲ VLSR ≲ 26.0 km s−1 and (b) 6.0 ≲ VLSR ≲ 34.0 km s−1. (c) The H2 column density map derived from the Herschel data. The lowest contour and the contour interval for the C18O map are 4.0 K km s−1. Contours are drawn at 2.8 K km−1 and 1.0 × 1022 cm−2 in the N2H+ and N(H2) maps, respectively. (Color online)