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Fig. 1


Overview of NGC 4414 derived from the 30′′ tapered data cube. Top-left: integrated H i intensity map (zeroth moment). The contour levels shown are (2,5,10) × 1019 cm-2 (black) and (2,5,10) × 1020 cm-2 (white). Top-right: integrated H i intensity overplotted on a deep KPNO B-band image. The optical image is shown using a logarithmic intensity scale. Contours shown are (2,20) × 1019 cm-2. The two short vertical lines indicate galaxy SDSS J122646.27+311904.8, as discussed in Sect. 4.2. Bottom-left: intensity-weighted mean first-moment velocity field. The thick black countour shows the systemic velocity of 711.5 km s-1. Black contours then decrease in steps of 25 km s-1, white contours increase in steps of 25 km s-1. The dashed white ellipse indicates the division between inner and outer disk as defined in Sect. 3. Bottom-right: second-moment velocity dispersion map. Black contours show values of (5, 10, 20) km s-1 (light-gray to dark-gray background). White contours show (50, 100) km s-1 (dark-gray to black background). The white ellipse indicates the division between inner and outer disk.

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