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We have conducted a large-field simultaneous survey of $^{12}$CO, $^{13}$CO,and C$^{18}$O $J=1-0$ emission toward the Cassiopeia A (Cas A) supernovaremnant (SNR), which covers a sky area of $3.5^{\circ}\times3.1^{\circ}$. TheCas giant molecular cloud (GMC) mainly consists of three individual clouds withmasses on the order of $10^4-10^5\ M_{\odot}$. The total mass derived from the$\rm{^{13}CO}$ emission of the GMC is 2.1$\times10^{5}\ M_{\odot}$ and is9.5$\times10^5\ M_{\odot}$ from the $\rm{^{12}CO}$ emission. Two regions withbroadened (6$-$7 km s$^{-1}$) or asymmetric $^{12}$CO line profiles are foundin the vicinity (within a 10$'\times10'$ region) of the Cas A SNR, indicatingpossible interactions between the SNR and the GMC. Using the GAUSSCLUMPSalgorithm, 547 $^{13}$CO clumps are identified in the GMC, 54$\%$ of which aresupercritical (i.e. $\alpha_{\rm{vir}}<2$). The mass spectrum of the molecularclumps follows a power-law distribution with an exponent of $-2.20$. Thepixel-by-pixel column density of the GMC can be fitted with a log-normalprobability distribution function (N-PDF). The median column density ofmolecular hydrogen in the GMC is $1.6\times10^{21}$ cm$^{-2}$ and half the massof the GMC is contained in regions with H$_2$ column density lower than$3\times10^{21}$ cm$^{-2}$, which is well below the threshold of starformation. The distribution of the YSO candidates in the region shows noagglomeration.

A Large-field J=1-0 Survey of CO and Its Isotopologues Toward the Cassiopeia A Supernova Remnant