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Fig. 6


12CO-to-13CO integrated intensity line ratio (10) map (left) and overlay of the same in contours on top of an HST ACS F435W filter gray-scale image (right). The ratio decreases from about 4045 at the northwestern edge down to ~30 along the nuclear dust lane, and ~10–20 at the northeastern, eastern, and western edges. 10 seems to be quite constant along the nuclear dust lane until the ratio steeply increases toward the dust lane in the west. North is up, east to the left, and the beam is shown in the lower right corner of each map. The cross marks the position of the phase center.

This figure is made of several images, please see below:

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