| Full text | |
| Author(s): |
Kolesnikov, I
;
Sampaio, V. M.
;
de Carvalho, R. R.
;
Conselice, C.
;
Rembold, S. B.
;
Mendes, C. L.
;
Rosa, R. R.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 528, n. 1, p. 26-pg., 2024-01-13. |
| Abstract | |
Galaxy morphology offers significant insights into the evolutionary pathways and underlying physics of galaxies. As astronomical data grow with surveys such as Euclid and Vera C. Rubin, there is a need for tools to classify and analyse the vast numbers of galaxies that will be observed. In this work, we introduce a novel classification technique blending unsupervised clustering based on morphological metrics with the scalability of supervised Convolutional Neural Networks. We delve into a comparative analysis between the well-known CAS (Concentration, Asymmetry, and Smoothness) metrics and our newly proposed EGG (Entropy, Gini, and Gradient Pattern Analysis). Our choice of the EGG system stems from its separation-oriented metrics, maximizing morphological class contrast. We leverage relationships between metrics and morphological classes, leading to an internal agreement between unsupervised clustering and supervised classification. Applying our methodology to the Sloan Digital Sky Survey data, we obtain similar to 95 per cent of Overall Accuracy of purely unsupervised classification and when we replicate T-Type and visually classified galaxy catalogues with accuracy of similar to 88 and similar to 89 per cent, respectively, illustrating the method's practicality. Furthermore, the application to Hubble Space Telescope data heralds the potential for unsupervised exploration of a higher redshift range. A notable achievement is our similar to 95 per cent accuracy in unsupervised classification, a result that rivals when juxtaposed with Traditional Machine Learning and closely trails when compared to Deep Learning benchmarks. (AU) | |
| FAPESP's process: | 20/15245-2 - The multi-object spectrograph (MOSAIC) for the extremely large telescope: spectroscopy of stellar populations in the milky way and external galaxies |
| Grantee: | Beatriz Leonor Silveira Barbuy |
| Support Opportunities: | Special Projects |
| FAPESP's process: | 20/16243-3 - Investigating environmental effects in galaxy evolution: from cosmological simulations to observations |
| Grantee: | Vitor Medeiros Sampaio |
| Support Opportunities: | Scholarships in Brazil - Doctorate |