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Fig. 1


Left panel: Spitzer/IRAC 8 μm  observations of the L1157 outflow (Looney et al. 2007; Takami et al. 2011). The resolution is ~ and the intensity color scale is logarithmic from 0.05 to 5 mJy/sr. The precession model (black line) is overplotted. Middle panels: the precession model (black line) is overplotted on integrated CO 1−0 and SiO 2−1 maps of the L1157 outflow by Gueth et al. (1996, 1998; IRAM-30 m + PdBI data, | VVsys | = 0−11 km s-1  for CO and 0−18 km s-1  for SiO, HPBW: , PA = 90° for CO, , PA = 56° for SiO). The first contour is at 5σ with steps of 3σ (1σ = 0.5 Jy km s-1/beam for CO, and 0.2 Jy km s-1/beam for SiO). The black squares indicate the driving source, L1157-mm, and the blueshifted knots. Right panels: zoom-in on the inner jet revealed by CO 2−1 and SiO 5−4 maps obtained with IRAM-PdBI as part of CALYPSO. The emission is integrated over high blue- and redshifted velocities (in | VVsys |) (blue/red contours) (HVb = 22−57 km s-1, HVr = 36−63 km s-1). CO 2−1 also shows emission at low velocities (green contours; LVb< 22 km s-1, LVr< 36 km s-1) . The gray-scale traces the continuum emission at 1.3 mm. The white squares indicate the continuum peak and the inner HV knots B and R. The ellipse in the bottom left corner shows the beam HPBW (, PA = 12° for CO, , PA = 0° for SiO). The first contour is at 5σ with steps of 3σ (1σ ~ 1.3 mJy/beam for continuum, and ~50, 70, 180 mJy km s-1/beam for SiO, CO HV, and CO LV, respectively). The precession is plotted in steps of 0.0025 × P, i.e., ~4.1 yr, where P = 1640 yr is the precession period (black squares).

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