Interaction between the W51C Supernova Remnant and a Molecular Cloud. II. Discovery of Shocked CO and HCO+

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Abstract

We carried out 12CO J \ 10, J \ 21, 13CO J \ 10, and HCO`J \ 10 line observations of the supernova remnant W51C in order to search for shocked molecules associated with the shocked H I reported in a companion paper. We discovered shocked CO distributed along an D8@ (or D14 pc at a distance of 6 kpc) long arc structure. The position and morphology of the CO distribution coincide with the shocked H I. The shocked CO has line-of-sight velocities between ]20 and ]50 km s~1 with respect to the ambient cloud and velocity widths of 821 km s~1. The CO emission is optically thin, and K. The shocked CO is clumpy, and we have identied ve clumps. Their column densities are T ex ^10 in the range N(CO) \ 1.24.0 ] 1016 cm~2. Total mass of the shocked CO is 0.16

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