This USS source at is a small 3" double see Figures 6a-6f.
At 20 cm the two
lobes are roughly equivalent in brightness, but by 2 cm the western
lobe A (
) has
faded substantially compared to the eastern lobe B (
).
There is a peculiar faint
knot beyond the eastern lobe to the northeast in the 6 cm image
(Fig. 6b). This feature
is not seen in the higher resolution image (Fig. 6g), nor in any map
(with the possible
exception of the 2 cm map, Fig 6c). It may be an artifact.
In the high spatial resolution images (0.4", Figures 6g - 6j) 4C24.28 faint extended emission from the center of the two lobes out towards lobe B is detected. This is clearly detected at 6 cm and a similar feature at 2 cm is likely to be real (Figures 6g and 6h). This one sided feature is not as steep spectrum as the lobes, and we identify it as the jet.
The polarimetric properties are highly asymmetric between the two lobes: A is completely depolarized, B has polarization structure at all three frequencies (Figures 6d-6f). In Figure 6d, the polarization at 20 cm is due to two components: the position angle appears to rotate smoothly from one to the other. The percentage polarization is greatest at 6 cm, and spatially unresolved - in contrast to the extended emission at 20 cm. At 2 cm, B is still polarized and has become spatially extended again, but on the eastern side of B rather than the western side as seen at 20 cm. Taken together, this suggest that we are seeing depolarization structure across the end of lobe B, perpendicular to the radio axis. The polarization image at high resolution is consistent with the low resolution measurements.
The optical identification of 4C24.28 is compact but resolved.
The Ly line emission is
slightly extended along the radio axis with a boxy morphology.
The broad band B image is
contaminated by the Ly
emission and thus is not a pure
continuum image. The structure
resembles the boxy nature of the line emission morphology. In R band
the continuum
is even more compact with a slightly southern extension. There is
faint diffuse emission
aligned along the radio axis. In I band, the peak of the emission
is shifted south from the
the other bands and has a ridge line parallel to the radio axis.
There is also some diffuse
emission to the east. The K band image is of poor quality, but the
continuum is extended along the radio axis.
There is one or possibly two faint components or companion objects along the radio axis to the southwest but beyond the radio lobe. It is not detected in the narrow band, and the K band emission is only roughly coincident - it straddles the two features in the R image. If these clumps are associated with 4C24.28, it may due to a strong ionization gradient causing different emission lines to enter and leave the broad bands, resulting in the irregular appearance and colors.