Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-28
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, Contribution to IAU Symp. 222, The interplay among Black Holes, Stars and ISM in Galactic Nuclei, Gramado,
Scientific paper
10.1017/S1743921304003229
In order to analyse the large numbers of Seyfert galaxy spectra available at present, we are testing new techniques to derive their physical parameters fastly and accurately. We present an experiment on such a new technique to segregate old and young stellar populations in galactic spectra using machine learning methods. We used an ensemble of classifiers, each classifier in the ensemble specializes in young or old populations and was trained with locally weighted regression and tested using ten-fold cross-validation. Since the relevant information concentrates in certain regions of the spectra we used the method of sequential floating backward selection offline for feature selection. Very interestingly, the application to Seyfert galaxies proved that this technique is very insensitive to the dilution by the Active Galactic Nucleus (AGN) continuum. Comparing with exhaustive search we concluded that both methods are similar in terms of accuracy but the machine learning method is faster by about two orders of magnitude.
Bressan Sandro
Fuentes Olac
Piedra Estrada T.
Solorio Thamar
Terlevich Elena
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