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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.03797 |
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| _version_ | 1866911053132070912 |
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| author | Feng, Hai-Cheng Li, Rui Napolitano, Nicola R. Li, Sha-Sha Bai, J. M. Dong, Yue Li, Ran Liu, H. T. Lu, Kai-Xing Pan, Zhi-Wei Radovich, Mario Shan, Huan-Yuan Wang, Jian-Guo Xi, Wen-Zhe Xie, Ling-Hua Yuan, Zun-Li Zhang, Yang-Wei |
| author_facet | Feng, Hai-Cheng Li, Rui Napolitano, Nicola R. Li, Sha-Sha Bai, J. M. Dong, Yue Li, Ran Liu, H. T. Lu, Kai-Xing Pan, Zhi-Wei Radovich, Mario Shan, Huan-Yuan Wang, Jian-Guo Xi, Wen-Zhe Xie, Ling-Hua Yuan, Zun-Li Zhang, Yang-Wei |
| contents | We present a novel multimodal neural network (MNN) for classifying astronomical sources in multiband ground-based observations, from optical to near infrared, to separate sources in stars, galaxies and quasars. Our approach combines a convolutional neural network branch for learning morphological features from $r$-band images with an artificial neural network branch for extracting spectral energy distribution (SED) information. Specifically, we have used 9-band optical ($ugri$) and NIR ($ZYHJK_s$) data from the Kilo-Degree Survey (KiDS) Data Release 5. The two branches of the network are concatenated and feed into fully-connected layers for final classification. We train the network on a spectroscopically confirmed sample from the Sloan Digital Sky Survey cross-matched with KiDS. The trained model achieves 98.76\% overall accuracy on an independent testing dataset, with F1 scores exceeding 95\% for each class. Raising the output probability threshold, we obtain higher purity at the cost of a lower completeness. We have also validated the network using external catalogs cross-matched with KiDS, correctly classifying 99.74\% of a pure star sample selected from Gaia parallaxes and proper motions, and 99.74\% of an external galaxy sample from the Galaxy and Mass Assembly survey, adjusted for low-redshift contamination. We apply the trained network to 27,335,836 KiDS DR5 sources with $r \leqslant 23$ mag to generate a new classification catalog. This MNN successfully leverages both morphological and SED information to enable efficient and robust classification of stars, quasars, and galaxies in large photometric surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_03797 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Morpho-Photometric Classification of KiDS DR5 Sources Based on Neural Networks: A Comprehensive Star-Quasar-Galaxy Catalog Feng, Hai-Cheng Li, Rui Napolitano, Nicola R. Li, Sha-Sha Bai, J. M. Dong, Yue Li, Ran Liu, H. T. Lu, Kai-Xing Pan, Zhi-Wei Radovich, Mario Shan, Huan-Yuan Wang, Jian-Guo Xi, Wen-Zhe Xie, Ling-Hua Yuan, Zun-Li Zhang, Yang-Wei Astrophysics of Galaxies We present a novel multimodal neural network (MNN) for classifying astronomical sources in multiband ground-based observations, from optical to near infrared, to separate sources in stars, galaxies and quasars. Our approach combines a convolutional neural network branch for learning morphological features from $r$-band images with an artificial neural network branch for extracting spectral energy distribution (SED) information. Specifically, we have used 9-band optical ($ugri$) and NIR ($ZYHJK_s$) data from the Kilo-Degree Survey (KiDS) Data Release 5. The two branches of the network are concatenated and feed into fully-connected layers for final classification. We train the network on a spectroscopically confirmed sample from the Sloan Digital Sky Survey cross-matched with KiDS. The trained model achieves 98.76\% overall accuracy on an independent testing dataset, with F1 scores exceeding 95\% for each class. Raising the output probability threshold, we obtain higher purity at the cost of a lower completeness. We have also validated the network using external catalogs cross-matched with KiDS, correctly classifying 99.74\% of a pure star sample selected from Gaia parallaxes and proper motions, and 99.74\% of an external galaxy sample from the Galaxy and Mass Assembly survey, adjusted for low-redshift contamination. We apply the trained network to 27,335,836 KiDS DR5 sources with $r \leqslant 23$ mag to generate a new classification catalog. This MNN successfully leverages both morphological and SED information to enable efficient and robust classification of stars, quasars, and galaxies in large photometric surveys. |
| title | Morpho-Photometric Classification of KiDS DR5 Sources Based on Neural Networks: A Comprehensive Star-Quasar-Galaxy Catalog |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.03797 |