Møller and Warren: HST images of a galaxy group at
z=2.81, and the ....
Figure 1. HST Wide Field Camera 2 sub-pixelised image of a
region 43 arcsec by 17 arcsec around the quasar PKS0528-250 (marked
Q), showing the three galaxies S1, S2, S3. The size of each sub-pixel
is 0.05 arcsec. The upper panel is a weighted average of the data for
the three filters, from all 30 orbits. The lower panel is the same
image convolved with a Gaussian profile of sigma=1.3 sub-pixel. An
inset panel shows a small region to the S of the quasar after
subtraction of the quasar image, revealing the image of S1. The scale
is shown by a horizontal bar of length 3 arcsec.