Lowerpanel: HCN J =1 → 0 spectra with a channel spacing of 3.3 km s−1. The black line indicates the spectrum from the northeastern region (peak near V = 710 km s−1) showing absorption. The red line indicates the spectrum from the southwestern region (peak near V = 430 km s−1) showing absorption. The separation between the two regions is the line perpendicular to the nuclear disk crossing the peak of the radio continuum emission (see Figs. 2 and A.1). Upper panel: the same is shown for H13 CN J = 1 → 0, but with a channel width of 24 km s−1. The ordinate provides average flux densities per beam over the covered area. The systemic velocity of the galaxy is close to V = 571 km s−1.
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