Revisiting the Hubble sequence in the SDSS DR7

Huertas-Company, M.; Aguerri, J. A. L.; Bernardi, M.; Mei, S.; Sánchez-Almeida, J.
Referencia bibliográfica

Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held in Madrid, September 13 - 17, 2010, Eds.: M. R. Zapatero Osorio, J. Gorgas, J. Maíz Apellániz, J. R. Pardo, and A. Gil de Paz., p. 210-215

Fecha de publicación:
11
2011
Número de autores
5
Número de autores del IAC
2
Número de citas
0
Número de citas referidas
0
Descripción
We present an automated morphological classification in 4 types (E, S0, Sab, Scd) of ˜ 700,000 galaxies from the SDSS DR7 spectroscopic sample based on support vector machines. The main new property of the classification is that we associate a probability to each galaxy of being in the four morphological classes instead of assigning a single class. The classification is therefore better adapted to nature where we expect a continuous transition between different morphological types. The algorithm is trained with a visual classification and then compared to several independent visual classifications including the Galaxy Zoo first-release catalog. We find a very good correlation between the automated classification and classical visual ones. The compiled catalog is intended for use in different applications and is therefore publicly available through a dedicated webpage (http://gepicom04.obspm.fr/sdss_morphology/Morphology_2010.html)