Fig. 2.
Left panel: HI map of NGC 5055 obtained by combining data taken in B, C and D configurations of VLA. Middle panel: HI map of NGC 5055 obtained after processing the HI map in left panel with the Nebuliser, i.e. after subtraction of diffuse background. Right panel: HI map of NGC 5055 obtained by reducing data taken in B configuration of VLA, which should not contain any diffuse background. The images obtained via the two methods (middle panel and right panel) show similar structure, and similar fraction of diffuse background (∼76% from Nebuliser and ∼78% from B-configuration map). All images have the same flux scale limits. The pixel size of the HI (B-configuration) (right panel) is 0.5 arcsec while the other two have pixel size of 2 arcsec, same as CO map.
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