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Table 2

Result of the non-LTE LVG analysis.

Component NSiO Size T nH2 XSiO(a)
× 1012 cm−2 K × 105 cm−3 × 10−7
HV-B1a 40(8) 10(2) 180(36) 6(1) 5(1)
HV-cold 40(8) 25(5) 40(8) 2.0(4) 0.5(1)
EHV-B1a 8(2) 9(2) 180(36) 6(1) 5(1)
EHV-cold 8(2) 20(4) 30(6) 2.0(4) 0.5(1)

Notes. The HV and EHV emissions are composed of two physical components each: the first is associated with the B1a clump, and the second is more extended (see text). (a) SiO abundance with respect to molecularhydrogen. The H2 column density used to calculate the SiO abundance is derived from the CO column density in the g1 and g2 components of the gas in L1157-B1 described in Lefloch et al. (2012), see Sect. 5.3. Numbers in parentheses are one standard deviation in units of the least significant digit. The errors on the sizes are derived from the observations.

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