SCORPIO: A deep survey of Radio Emission from the stellar life-cycle

Abstract

Radio emission has been detected in a broad variety of stellar objects from all stages of stellar evolution. However, most of our knowledge originates from targeted observations of small samples, which are strongly biased to sources which are peculiar at other wavelengths. In order to tackle this problem we have conducted a deep 1.4 GHz survey by using the Australian Telescope Compact Array (ATCA), following the same observing setup as that used for the Australia Telescope Large Area Survey (ATLAS) project, this time choosing a region more appropriate for stellar work. In this paper, the SCORPIO project is presented as well as results from the pilot experiment. The achieved rms is about 30 /uJy and the angular resolution ~10 arcsec. About six hundred of point-like sources have been extracted just from the pilot field. A very small percentage of them are classified in SIMBAD or the NASA/IPAC Extragalactic Database (NED). About 80 % of the extracted sources are reported in one of the inspected catalogues and 50 % of them appears to belong to a reddened stellar/galactic population. The evaluation of extragalactic contaminants is very difficult without further investigations. Interesting results have been obtained for extended radio sources that fall in the SCORPIO field. Many bubble-like structures have been found, some of which are classified at other wavelengths. However, for all of these sources, our project has provided us with images of unprecedented sensitivity and angular resolution at 2.1 GHz.

11 pages, 9 figures, submitted to MNRAS

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• Radio Stars: from kHz to THz
• Radio variability and non-thermal components in stars evolving toward planetary nebulae
• Radio astronomical images object detection and segmentation: A benchmark on deep learning methods
• Evolutionary Map of the Universe (EMU):Compact radio sources in the SCORPIO field towards the Galactic plane
• The Southern HII Region Discovery Survey (SHRDS): Pilot Survey
• High-resolution Very Large Array observations of 18 MIPSGAL bubbles
• Self-supervised contrastive learning of radio data for source detection, classification and peculiar object discovery
• Hydra II: Characterisation of Aegean, Caesar, ProFound, PyBDSF, and Selavy source finders
• The SARAO MeerKAT Galactic Plane Survey extended source catalogue
• Hydra I: An extensible multi-source-finder comparison and cataloguing tool
• SCORPIO-II: Spectral indices of weak Galactic radio sources
• Study of the Galactic radio sources in the SCORPIO survey resolved by ATCA at 2.1 GHz
• The stellar population in the SARAO MeerKAT Galactic Plane Survey
• Challenges faced by current Galactic planetary nebula surveys