Velocity channel maps of 28SiO observed with high spectral resolution (0.5 km s−1) at very high (−19.72 km s−1), high (−10.70 km s−1), and low velocity (−1.22 km s−1), and the spectra (bottom left) extracted at the position of the intensity peak in each channel. The white contours in the −19.72 km s−1 channel mapstart at 5σ, with steps of 5σ (rms = 5 mJy beam−1). The white contours in the −10.70 km s−1 channel mapstart at 25σ, with steps of 20σ. The white contours in the −1.22 km s−1 channel mapstart at 25σ, with steps of 25σ. The clean beam of 3.8′′ × 2.8′′ is shown in the bottom left corner of the maps, and the primary beam of 56′′ is reported as a dashed white circle. The green contours in the channel maps show the 10, 60, and 120σ levels of the integrated intensity map of the 28SiO, shown in Fig. 1. B0, B1, and B2 are three shock regions along the outflow of L1157, and they are composed of several subclumps marked here with circles (B0), triangles (B1), and squares (B2) (Benedettini et al. 2007). The vertical solid line in the spectra shows the systemic velocity of L1157-B1, +2.6 km s−1. The vertical dotted lines show the intervals of velocity used to run the LVG, (−23, −13) km s−1 for the EHV and (−13, −3) km s−1 for the HV.
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