Morphological Classification of galaxies by Artificial Neural Networks
Abstract
We explore a method for automatic morphological classification of galaxies by an Artificial Neural Network algorithm. The method is illustrated using 13 galaxy parameters measured by machine (ESO-LV), and classified into five types (E, S0, Sa + Sb, Sc + Sd and Irr). A simple Backpropagation algorithm allows us to train a network on a subset of the catalogue according to human classification, and then to predict, using the measured parameters, the classification for the rest of the catalogue. We show that the neural network behaves in our problem as a Bayesian classifier, i.e. it assigns the a posteriori probability for each of the five classes considered. The network highest probability choice agrees with the catalogue classification for 64 percent of the galaxies. If either the first or the second highest probability choice of the network is considered, the success rate is 90 per cent. The technique allows uniform and more objective classification of very large extragalactic data sets.
Additional Information
© 1992 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Accepted 1992 September 2. Received 1992 August 24. We thank W. Fitzgerald, J. Hertz, M. Irwin and D. Lynden-Bell for helpful discussions. LSI thanks FAPESP and USP/BID and MCSL thanks the Sheepshanks Fund for financial support.Attached Files
Published - 1992MNRAS_259P___8S.pdf
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Additional details
- Eprint ID
- 75285
- Resolver ID
- CaltechAUTHORS:20170321-145448467
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Universidade de São Paulo
- Sheepshanks Fund
- Created
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2017-03-22Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field