Afrida Alam
A catalogue of complex radio sources in the Rapid ASKAP Continuum Survey created using a Self-Organising Map
Alam, Afrida; Pimbblet, Kevin; Gordon, Yjan
Abstract
Next generations of radio surveys are expected to identify tens of millions of new sources, and identifying and classifying their morphologies will require novel and more efficient methods. Self-Organising Maps (SOMs), a type of unsupervised machine learning, can be used to address this problem. We map 251,259 multi-Gaussian sources from Rapid ASKAP Continuum Survey (RACS) onto a SOM with discrete neurons. Similarity metrics, such as Euclidean distances, can be used to identify the best-matching neuron or unit (BMU) for each input image. We establish a reliability threshold by visually inspecting a subset of input images and their corresponding BMU. We label the individual neurons based on observed morphologies and these labels are included in our value-added catalogue of RACS sources. Sources for which the Euclidean distance to their BMU is ≲ 5 (accounting for approximately 79% of sources) have an estimated > 90% reliability for their SOM-derived morphological labels. This reliability falls to less than 70% at Euclidean distances ≳ 7. Beyond this threshold it is unlikely that the morphological label will accurately describe a given source. Our catalogue of complex radio sources from RACS with their SOM-derived morphological labels from this work will be made publicly available.
Citation
Alam, A., Pimbblet, K., & Gordon, Y. (2025). A catalogue of complex radio sources in the Rapid ASKAP Continuum Survey created using a Self-Organising Map. Publications / Astronomical Society of Australia, 42, Article e013. https://doi.org/10.1017/pasa.2024.133
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 9, 2024 |
Online Publication Date | Jan 17, 2025 |
Publication Date | Jan 1, 2025 |
Deposit Date | Jan 7, 2025 |
Publicly Available Date | Jan 17, 2025 |
Journal | Publications of the Astronomical Society of Australia |
Print ISSN | 1323-3580 |
Publisher | Cambridge University Press |
Peer Reviewed | Peer Reviewed |
Volume | 42 |
Article Number | e013 |
DOI | https://doi.org/10.1017/pasa.2024.133 |
Keywords | Radio continuum: galaxies; Methods: data analysis; Catalogues |
Public URL | https://hull-repository.worktribe.com/output/5001659 |
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Copyright Statement
c The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
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