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Fig. 2


MWISP 13CO (1–0) velocity-integrated intensity image of Tycho’s SNR. The unit of the scale bar is K km s-1. The emission is integrated between 65 and 59 km s-1, and the contours start at 3σ and then increase in steps of 2σ (1σ~ 0.4 K km s-1). The red circle shows the position and size of the shell-like structure in Tycho’s SNR, while the yellow dashed ellipse shows the cavity found in the MWISP 12CO images. The numbers in the image mark the positions for sampling the CO spectra of the clouds.

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