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We report on our new analysis of the spatial and kinematical distribution ofwarm and cold molecular gas in NGC 6240, which was undertaken to explore theorigin of its unusually luminous H$_2$ emission. By comparing three-dimensionalemission-line data (in space and velocity) of CO (J=2-1) in the radio and H$_2$in the near infrared, we are able to study the H$_2$ emitting efficiency,defined in terms of the intensity ratio of H$_2$ to CO [$I$(H$_2$)/$I$(CO)], asa function of velocity. The integrated H$_2$ emitting efficiency is calculatedby integrating the velocity profile of H$_2$ emitting efficiency in blue, red,and total (blue + red) velocity regions of the profile. We find that (1) boththe total H$_2$ emitting efficiency and the blue-to-red ratio of the efficiencyare larger in regions surrounding the CO and H$_2$ intensity peaks, and (2) theH$_2$ emitting efficiency and the kinematical conditions in the warm moleculargas are closely related to each other. A collision between the molecular gasconcentration and the external superwind outflow from the southern nucleusseems plausible to explain these characteristics, since it can reproduce theenhanced emitting efficiency of blueshifted H$_2$ around the molecular gasconcentration, if we assume that the superwind blows from the southern nucleustoward us, hitting the entire gas concentration from behind. In this model,internal cloud-cloud collisions within the molecular gas concentration areenhanced by the interaction with the superwind outflow, and efficient andintense shock-excited H$_2$ emission is expected as a result of thecloud-crushing mechanism.Comment: 12 pages, 6 figures, accepted for publication in A

the astronomical journal

Superwind-driven Intense H<sub>2</sub>Emission in NGC 6240. II. Detailed Comparison of Kinematic and Morphological Structures of the Warm and Cold Molecular Gas

Superwind-driven Intense H2Emission in NGC 6240. II. Detailed Comparison of Kinematic and Morphological Structures of the Warm and Cold Molecular Gas

Superwind-driven Intense H₂Emission in NGC 6240. II. Detailed Comparison of Kinematic and Morphological Structures of the Warm and Cold Molecular Gas