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We have carried out CO J=2-1 and CO J=3-2 observations toward Tycho'ssupernova remnant (SNR) using the KOSMA 3m-Telescope. From these observationswe identified three molecular clouds (MCs) around the SNR. The small cloud inthe southwest was discovered for the first time. In the north and east, two MCs(cloud A and cloud B) adjacent in space display a bow-shaped morphology, andhave broad emission lines, which provide some direct evidences of the SNR-MCsinteraction. The MCs is revealed at -69~-59 km \s, well coincident with theTycho's SNR. The MCs associated with Tycho's SNR have a mass of ~2130 sunmasses. Position-velocity diagrams show the two clouds adjacent in velocitywhich means possible cloud-cloud collision in this region. The maximum value(0.66) of integrated CO line intensity ratio I(CO J=3-2/CO J=2-1) for the threeMCs agrees well with the previous measurement of individual Galactic MCs,implying that the SNR shock just drove into the MCs. The two MCs have a lineintensity ratio gradient. The distribution of the ratio appears to indicatethat the shock propagates from the southwest to the northeast.

Submillimeter/millimeter observations of the molecular clouds associated with the Tycho' Supernova Remnant