Study of the Galactic radio sources in the SCORPIO survey resolved by ATCA at 2.1 GHz

TL;DR

This paper catalogs extended radio sources in the SCORPIO survey, revealing new Galactic objects and demonstrating the survey's potential for future Galactic studies with the ATCA at 2.1 GHz.

Contribution

It presents a new catalog of extended radio sources, including newly identified Galactic objects, and discusses the challenges and potential of future radio surveys.

Findings

99 extended sources cataloged, 35 new detections

Proposed 6 new H II regions, 2 planetary nebulae, 2 LBV/W-R stars, 3 SNRs

Demonstrated survey's capability to identify Galactic sources

Abstract

We 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 between 1.4 and 3.1 GHz, centered at l=343.5{\deg}, b=0.75{\deg} and with an angular resolution of about 10 arcsec. It is aimed at understanding the scientific and technical challenges to be faced by future Galactic surveys. With a mean sensitivity around 100 $\mu$Jy/beam and the possibility to recover angular scales at least up to 4 arcmin, we extracted 99 extended sources, 35 of them detected for the first time. Among the 64 known sources 55 had at least a tentative classification in literature. Studying the radio morphology and comparing the radio emission with infrared we propose as candidates 6 new H II regions, 2 new planetary nebulae, 2 new luminous blue variable or Wolf--Rayet stars and 3 new supernova remnants. This study provides an overview of the potentiality of future radio surveys in terms of Galactic source extraction and characterization and a discussion on the difficulty to reduce and analyze interferometric data on the Galactic plane.