Logarithm of the integrated intensity ratio. Top: log (∫T(SiO)dv/∫T(HCO + )dv) in the velocity range from 30 to 130 kms-1. The contours correspond to the HCO+ emission at 3σ and 30σ. We can identify clearly regions where either the SiO (e.g. in the 1.3 Complex and in the M+3.2+0.3 cloud) or HCO+ (e.g. towards Sgr A region) dominate. Bottom: log (∫T(SiO)dv/∫T(H13CO + )dv) in the velocity range from −110 to −50 kms-1. The contours correspond to the SiO emission at 3σ and 30σ. In this velocity range, we can see the enhacement of the SiO toward the M − 3.8+0.9 cloud.
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