Volume 525, January 2011
|Number of page(s)||13|
|Section||Catalogs and data|
|Published online||10 December 2010|
Revisiting the Hubble sequence in the SDSS DR7 spectroscopic sample: a publicly available Bayesian automated classification⋆
GEPI, Paris-Meudon Observatory,
5 Place Jules Janssen,
2 Université Paris Diderot, 75205 Paris Cedex 13, France
3 Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, 38200 La Laguna, Spain
4 Department of Physics & Astronomy, University of Pennsylvania, 209 S. 33rd St., Philadelphia, PA 19104, USA
Received: 10 September 2010
Accepted: 14 October 2010
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 freely available through a dedicated webpage⋆ and soon from the CasJobs database.
Key words: catalogs / astronomical databases: miscellaneous / Galaxy: fundamental parameters / galaxies: evolution / Galaxy: formation
Full catalog is only available in electronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/525/A157 or via http://gepicom04.obspm.fr/sdss_morphology/Morphology_2010.html
© ESO, 2010
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