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ALMA cycle 3 observations of $^{12}$CO $ J = 3\rightarrow2$, $^{13}$CO $J =4\rightarrow 3$, SiO J = $8 \rightarrow 7$, and HCN J = $ 5 \rightarrow 4$ arepresented. Significant extended emission is detected in $^{12}$CO J $ =3\rightarrow2$ with a morphology that is indicative of m = 2 tidal features,suggesting gas inflow. In addition, outflow for both nuclei are found in the$^{12}$CO J $ = 3\rightarrow2$. Significant SiO absorption is detected in thewestern nucleus. HCN that is morphologically distinct from CO is detected inboth nuclei. These observations are compared to non-LTE radiative transfermodels created using the Line Modeling Engine (LIME) for simple gas dynamics togain insight into how physical parameters, such as rotational velocity,turbulent velocity, gas temperature, dust temperature, and gas mass canreproduce the observed kinematic and spatial features. The eastern nucleus isfound to be best modeled with an inclusion of a temperature asymmetry from oneside of the disk to the other. It is also found that the western nucleus isoptically thick even in the less abundant species of $^{13}$CO, absorbingsignificant amounts of continuum radiation.

Arp 220: New Observational Insights into the Structure and Kinematics of the Nuclear Molecular Disks and Surrounding Gas