Fig. 6.
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Comparison between the JVLA H I absorption data and the kinematics of the molecular CND as observed with ALMA by Oosterloo et al. (2023). Left: the JVLA H I absorption profile (extracted from the central beam of the natural weighting cube and shown in red; inverted to facilitate comparison) and the profile of the integrated CO(2−1) emission from the circum-nuclear molecular disc shown in blue (Oosterloo et al. 2023). The H I profile has been smoothed to the same velocity resolution as the CO(2−1) profile, and the profiles have been normalised to the peak. Right: position-velocity diagram of the circum-nuclear CO disc taken along the kinematic major axis (from Oosterloo et al. 2023). The full range of velocities clearly only occurs for radii smaller than 50 pc. In both panels the velocities are with respect to the systemic velocity of NGC 1275.
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