  Observations of the radio remnant of Supernova 1987A using the Australia
Telescope Compact Array in the 12-mm band on 2003 July 31 (day 6002.7 after the
explosion) give the first fully resolved radio image of the supernova remnant.
The diffraction-limited image has a resolution of about 0.45 arcsec, a factor
of two better than that of the 3-cm images previously obtained. There is
excellent agreement between the 12-mm image and a contemporaneous
super-resolved 3-cm image. Super-resolution of the 12-mm image gives a further
factor of two improvement in resolution, to 0.25 arcsec, albeit with limited
dynamic range. While the spatial distributions of the radio and X-ray emission
are broadly similar, there are significant differences in detail with no
correspondence in the regions of brightest emission. The 12-mm image is well
modelled by a thick equatorial ring inclined at 43 deg to the line of sight.
This, together with the common east-west asymmetry and the relatively steady
increase in the radio flux density, suggests that the reverse shock is the main
site for generation of the radio emission.
