Fig. 4

HCN 1–0 velocity field (including only velocities ± 200 km s-1) showing the rotation of the molecular disk. The HCN 1–0 emission rotates in the same east-west fashion as the 12CO emission (Bryant & Scoville 1996; Downes & Solomon 1998). The grayscale ranges from − 100 to 100 km s-1 and the contours are 20 km s-1 × (−4, −3, −2, −1, 0, 1, 2, 3, 4). Zero velocity was set to redshift z = 0.042170 and 1′′ = 870 pc. Cross marks the VLBI radio continuum position (see footnote to Table 1). Hatched ellipse indicates beam size and orientation.
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