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The results of Mopra molecular spectral line observations towards thesupernova remnant HESSJ1731-347 (G353.6-0.7) and the unidentified gamma-raysource HESSJ1729-345 are presented. Dense molecular gas in three differentvelocity-bands (corresponding to three Galactic arms) are investigated usingthe CS(1-0) line. The CS-traced component provides information about the densetarget material in a hadronic scenario for gamma-ray production (cosmic raysinteracting with gas) and an understanding of the dynamics. Furthermore, theeffects of cosmic ray diffusion into dense gas may alter the gamma-ray spectrumto cause a flattening of spectra towards such regions. Dense molecular gas massat a level of ~10^5 Mo was revealed in this survey, with mass of the order of~10^3 Mo towards HESSJ1729-345 in each coincident Galactic arm, but nosignificant detection of dense molecular gas towards HESSJ1731-347 at thecurrently-preferred distance of ~5.2-6.2 kpc was discovered.

A dense gas survey of the gamma-ray sources HESS J1731-347 and HESS J1729-345