We present the CO observations (12CO, 13CO and C18O (J=1-0)) toward the supernova remnant (SNR) G22.7-0.2 using 13.7m millimeter wavelength telescope in Delingha. The observation covers about 1 square degree molecular cloud (MC) for the complex region. The signature of the SNR-MC interaction is found in the southern region of the remnant, which indicates that the SNR is interacting with the ambient MCs. The very wide line broadening (77-110km/s) show the convincing evidence of the physical association between SNR G22.7-0.2 and the 77km/s GMC G23.0-0.4. It places these objects at the near distance of 4.4kpc, which agree with a location on the Scutum-Crux arm. The relationship between SNR G22.7-0.2 and the ambient HII regions, SNRs and TeV sources, are also discussed. Please find the detailed information in http://adsabs.harvard.edu/abs/2014ApJ...796..122S

Figure 1: CO intensity maps (C18O in red, 13CO in green and 12CO in blue) toward SNR G22.7-0.2 overlaid with the VGPS 1.4GHz radio continuum emission contours. The black box indicates the region from which the spectra of the shocked gas are extracted (see Figure 2). The red rectangle and the yellow rectangle show the region of GMC G23.0−0.4W and GMC G22.6−0.2, respectively. The red circle shows the location of the TeV source of HESS J1832–093.

Figure 12: 12CO(J = 1–0; black), 13CO(J = 1–0; blue, multiplied by a factor of three), C18O  (J = 1–0; green, multiplied by a factor of six), and 12CO(J = 2–1; red) spectra of the shocked  gas extracted from the region indicated in Figure 1.