a) NH3(1, 1) intensity map (∫TMBdv) of L1251C. The starting point for the contour levels is 1.2 K km s-1; the increment is 0.9 K km s-1. The crosses mark measured positions. The stars indicate the location of the IR sources detected by IRAS. b) NH3(1, 1) radial velocity field (color map) shown after subtracting the mean radial velocity ⟨ VLSR ⟩ = −4.80 km s-1. The NH3 peak is labeled as in Table 1. The (0, 0) map position is RA = 22:35:53.6, Dec = 75:18:55 (J2000). c) The grey and blue contours show, respectively, the NH3(1, 1) and N2H+(1–0) intensities integrated over all hyperfine components. The thick contours denote the half-maximum (50%) level, which defines the core size in the corresponding emission line. The N2H+(1–0) data are taken from Fig. 2 of Caselli et al. (2002), where the contour levels are 0.4, 0.7, 1.0, 1.2, 1.5, and 1.8 K km s-1, and the peak intensity is 1.91 ± 0.12 K km s-1.
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