Ingallinera et al. present a catalogue of a large sample of extended radio sources in the SCORPIO field, observed and resolved by the Australia Telescope Compact Array. SCORPIO, a pathfinder project for addressing the early operations of the Australia SKA Pathfinder, is a survey of ∼5 square degrees around the plane of our Galaxy, conducted between 1.4 and 3.1 GHz with an angular resolution of about 10 arc-seconds. It is aimed at understanding the scientific and technical challenges to be faced by future Galactic surveys. With the ability to recover angular scales up to 4 arc-minutes, 99 extended sources were found, 35 of them detected for the first time. Studying the radio morphology and comparing the radio emission with infra-red observations led to proposed identification of 6 sources as new H II regions, 2 as new planetary nebulae, 2 as new luminous blue variable or Wolf–Rayet stars and 3 as new supernova remnants.

The image above shows a two-color image of the known H II region SCO J170054-421917 (the ATCA radio data in red, the GLIMPSE 8 µm infra-red data in cyan). It is apparent that the prominent 8-µm emission completely wraps around the radio. More details are given in the paper , published in Monthly Notices of the Royal Astronomical Society .