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Galaxy classification: deep learning on the OTELO and COSMOS databases

Abstract: Context. The accurate classification of hundreds of thousands of galaxies observed in modern deep surveys is imperative if we want to understand the universe and its evolution. Aims. Here, we report the use of machine learning techniques to classify early- and late-type galaxies in the OTELO and COSMOS databases using optical and infrared photometry and available shape parameters: either the Sérsic index or the concentration index. Methods. We used three classification methods for the OTELO database: (1) u? -? r color separation, (2) linear discriminant analysis using u? -? r and a shape parameter classification, and (3) a deep neural network using the r magnitude, several colors, and a shape parameter. We analyzed the performance of each method by sample bootstrapping and tested the performance of our neural network architecture using COSMOS data. Results. The accuracy achieved by the deep neural network is greater than that of the other classification methods, and it can also operate with missing data. Our neural network architecture is able to classify both OTELO and COSMOS datasets regardless of small differences in the photometric bands used in each catalog. Conclusions. In this study we show that the use of deep neural networks is a robust method to mine the cataloged data.

 Fuente: Astronomy & Astrophysics, 2020, 638, A134

 Editorial: EDP Sciences

 Fecha de publicación: 01/06/2020

 Nº de páginas: 15

 Tipo de publicación: Artículo de Revista

 DOI: 10.1051/0004-6361/202037697

 ISSN: 0004-6361,1432-0746

 Proyecto español: AYA2014-58861-C3-1-P

 Url de la publicación: https://doi.org/10.1051/0004-6361/202037697

Autoría

DE DIEGO, JOSÉ A.

NADOLNY, JAKUB

BONGIOVANNI, ÁNGEL

CEPA, JORDI

POVIC, MIRJANA

PÉREZ GARCÍA, ANA MARÍA

PADILLA TORRES, CARMEN P.

LARA-LÓPEZ, MARITZA A.

CERVIÑO, MIGUEL

MARTÍNEZ, RICARDO PÉREZ

ALFARO, EMILIO J.

CASTAÑEDA, HÉCTOR O.

FERNÁNDEZ-LORENZO, MIRIAM

GALLEGO, JESÚS

GONZÁLEZ, J. JESÚS

PINTOS-CASTRO, IRENE

SÁNCHEZ-PORTAL, MIGUEL

CEDRÉS, BERNABE&ACUTE

GONZÁLEZ-OTERO, MAURO