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We report a discovery of shocked gas from the supernova remnant (SNR)G357.7+0.3. Our millimeter and submillimeter observations reveal broadmolecular lines of CO(2-1), CO(3-2), CO(4-3), 13CO (2-1) and 13CO (3-2), HCO^+and HCN using HHSMT, Arizona 12-Meter Telescope, APEX and MOPRA Telescope. Thewidths of the broad lines are 15-30 kms, and the detection of such broad linesis unambiguous, dynamic evidence showing that the SNR G357.7+0.3 is interactingwith molecular clouds. The broad lines appear in extended regions (>4.5'x5').We also present detection of shocked H2 emission in mid-infrared but lackingionic lines using the Spitzer IRS observations to map a few arcmin area. The H2excitation diagram shows a best-fit with a two-temperature LTE model with thetemperatures of ~200 and 660 K. We observed [C II] at 158um and high-JCO(11-10) with the GREAT on SOFIA. The GREAT spectrum of [C II], a 3 sigmadetection, shows a broad line profile with a width of 15.7 km/s that is similarto those of broad CO molecular lines. The line width of [C~II] implies thationic lines can come from a low-velocity C-shock. Comparison of H2 emissionwith shock models shows that a combination of two C-shock models is favoredover a combination of C- and J-shocks or a single shock. We estimate the COdensity, column density, and temperature using a RADEX model. The best-fitmodel with n(H2) = 1.7x10^{4} cm^{-3}, N(CO) = 5.6x10^{16} cm^{-2}, and T = 75K can reproduce the observed millimeter CO brightnesses.

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Discovery of Broad Molecular lines and of Shocked Molecular Hydrogen  from the Supernova Remnant G357.7+0.3: HHSMT, APEX, Spitzer and SOFIA  Observations