Fig. 4

Tapered (dark gray) and original 2008 November TANAMI image (light gray). A taper of 0.1 at 25 Mλ was chosen and the image was restored with the common beam of (3 × 13) mas at 5° as applied in Tingay et al. (2001) in order to compare the TANAMI observations with these previous VLBI measurements. In the lower left the size of the respective restoring beam is shown as a gray/black ellipse. The tapered TANAMI image is remarkably similar to the images by Tingay et al. (1998, 2001). The extrapolation of the motions of the components monitored by Tingay et al. (2001), adopting the respective measured apparent speed for each of the three components C1, C2, and C3, results in hypothetical component positions for this observation. The black filled circles indicate these expected positions, the purple/blue/cyan lines represent the positional uncertainties of C3/C2/C3 derived from the velocity error. This comparison shows that TANAMI observations are consistent with previous results.
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