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Revisiting the Hubble sequence in the SDSS DR7 spectroscopic sample: a publicly available Bayesian automated classification

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

Astronomy and astrophysics (Berlin), 2011-01, Vol.525, p.A157 [Periódico revisado por pares]

EDP Sciences

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  • Título:
    Revisiting the Hubble sequence in the SDSS DR7 spectroscopic sample: a publicly available Bayesian automated classification
  • Autor: Huertas-Company, M. ; Aguerri, J. A. L. ; Bernardi, M. ; Mei, S. ; Sánchez Almeida, J.
  • Assuntos: astronomical databases: miscellaneous ; Astrophysics ; galaxies: evolution ; Galaxy: formation ; Galaxy: fundamental parameters ; Physics
  • É parte de: Astronomy and astrophysics (Berlin), 2011-01, Vol.525, p.A157
  • Notas: publisher-ID:aa15735-10
    ark:/67375/80W-XQ48TMSH-M
    e-mail: marc.huertas@obspm.fr
    Full catalog is only available in electronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) 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
    dkey:10.1051/0004-6361/201015735
    bibcode:2011A%26A...525A.157H
    istex:101FE234FD8D47FADE32769C765F47A622F7AE7A
  • Descrição: 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.
  • Editor: EDP Sciences
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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