Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26517
Title: | Automated detection of extended sources in radio maps: progress from the SCORPIO survey | Authors: | RIGGI, Simone INGALLINERA, Adriano LETO, PAOLO Cavallaro, Francesco BUFANO, FILOMENA SCHILLIRO', FRANCESCO TRIGILIO, CORRADO UMANA, Grazia Maria Gloria BUEMI, CARLA SIMONA Norris, R. P. |
Issue Date: | 2016 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 460 | Issue: | 2 | First Page: | 1486 | Abstract: | Automated source extraction and parametrization represents a crucial challenge for the next-generation radio interferometer surveys, such as those performed with the Square Kilometre Array (SKA) and its precursors. In this paper, we present a new algorithm, called CAESAR (Compact And Extended Source Automated Recognition), to detect and parametrize extended sources in radio interferometric maps. It is based on a pre-filtering stage, allowing image denoising, compact source suppression and enhancement of diffuse emission, followed by an adaptive superpixel clustering stage for final source segmentation. A parametrization stage provides source flux information and a wide range of morphology estimators for post-processing analysis. We developed CAESAR in a modular software library, also including different methods for local background estimation and image filtering, along with alternative algorithms for both compact and diffuse source extraction. The method was applied to real radio continuum data collected at the Australian Telescope Compact Array (ATCA) within the SCORPIO project, a pathfinder of the Evolutionary Map of the Universe (EMU) survey at the Australian Square Kilometre Array Pathfinder (ASKAP). The source reconstruction capabilities were studied over different test fields in the presence of compact sources, imaging artefacts and diffuse emission from the Galactic plane and compared with existing algorithms. When compared to a human-driven analysis, the designed algorithm was found capable of detecting known target sources and regions of diffuse emission, outperforming alternative approaches over the considered fields. | URI: | http://hdl.handle.net/20.500.12386/26517 | URL: | http://arxiv.org/abs/1605.01852v1 https://academic.oup.com/mnras/article/460/2/1486/2609172 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw982 | Bibcode ADS: | 2016MNRAS.460.1486R | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
MNRAS-2016-Riggi-1486-99.pdf | Pdf editoriale | 7.11 MB | Adobe PDF | View/Open |
Page view(s)
83
checked on Aug 5, 2024
Download(s)
25
checked on Aug 5, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.