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Fig. 7

image

Result of the simultaneous fit of the 28SiO (circles), 29SiO (stars), and 30SiO (triangles) fluxes of the HV (left panel) and EHV (right panel) components (Table 1) as a function of the upper level J of the transition. The HV best fitis obtained with two components: (i) a cold component (magenta curves) with T = 40 K, nH2 = 2 × 105 cm−3, and NSiO = 4 × 1013 cm−2 that extends 25″, and (ii) a warm component associated with B1a (blue curves) with T = 180 K, nH2 = 6 × 105 cm−3, NSiO = 4 × 1013 cm−2 and sizes = 10″. The sum of the two components (green curves) fits the observations very well. Similarly, the EHV best fit is obtained with two components: (i) a cold component (magenta curves) with T = 30 K, nH2 = 2 × 105 cm−3, and NSiO = 8 × 1012 cm−2, that extends 20″, and (ii) a warm component associated with B1a (blue curves) with T = 180 K, nH2 = 6 × 105 cm−3 and NSiO = 8 × 1012 cm−2 that extends 9″. The sum of the two components (green curves) fits the observations very well.

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