Evolutionary Map of the Universe: Radio-continuum Detection of the Galactic Planetary Nebula DS 1, a Mixed Bag of Spatially Correlated Astronomical Sources

We present a radio-continuum detection of the Galactic Planetary Nebula (PN) DS 1 at 943.5 MHz using Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe (EMU) observations. We find that the radio emission closely traces the optical H α . The central source is KV Vel, a binary with a brown dwarf companion, which are not detected at the EMU frequency. At the distance of KV Vel (789 − 17 + 21 pc), the radio emission has semi-axes of 0.50 − 0.01 + 0.02 × 0.3 7 − 0.01 + 0.01 pc, based on an angular size of 132″ × 97″. This is slightly smaller than the H α emission, placing the radio emission within the PN interior. There are several background sources, with many point sources in the confines of the diffuse radio emission. One of these corresponds to a background galaxy (2MASX J10544233–4846198), which is seen right through the center of the PN emission.