Discovery of a new extragalactic circular radio source with ASKAP: ORC
  J0102-2450
  We present the discovery of another Odd Radio Circle (ORC) with the
Australian Square Kilometre Array Pathfinder (ASKAP) at 944 MHz. The observed
radio ring, ORC J0102-2450, has a diameter of ~70 arcsec or 300 kpc, if
associated with the central elliptical galaxy DES J010224.33-245039.5 (z ~
0.27). Considering the overall radio morphology (circular ring and core) and
lack of ring emission at non-radio wavelengths, we investigate if ORC
J0102-2450 could be the relic lobe of a giant radio galaxy seen end-on or the
result of a giant blast wave. We also explore possible interaction scenarios,
for example, with the companion galaxy, DES J010226.15-245104.9, located in or
projected onto the south-eastern part of the ring. We encourage the search for
further ORCs in radio surveys to study their properties and origin.
