Color Separation of Galaxy Types in the Sloan Digital Sky Survey Imaging Data

  title={Color Separation of Galaxy Types in the Sloan Digital Sky Survey Imaging Data},
  author={Iskra V. Strateva and Željko Ivezi{\'c} and Gillian R. Knapp and Vijay K. Narayanan and Michael A. Strauss and James E. Gunn and Robert H. Lupton and David J. Schlegel and Neta A. Bahcall and Jonathan Brinkmann and Robert J. Brunner and Tam{\'a}s Budav{\'a}ri and Istv{\'a}n Csabai and Francisco Javier Castander and Mamoru Doi and Masataka Fukugita and Zsuzsanna Győry and Masaru Hamabe and Gregory S. Hennessy and Takashi Ichikawa and Peter Z. Kunszt and Donald Q. Lamb and Timothy A. Mckay and Sadanori Okamura and Judith L. Racusin and Maki Sekiguchi and Donald P. Schneider and Kazuhiro Shimasaku and Donald G. York},
  journal={The Astronomical Journal},
  pages={1861 - 1874}
We study the optical colors of 147,920 galaxies brighter than g* = 21, observed in five bands by the Sloan Digital Sky Survey (SDSS) over ∼100 deg2 of high Galactic latitude sky along the celestial equator. The distribution of galaxies in the g*-r* versus u*-g* color-color diagram is strongly bimodal, with an optimal color separator of u*-r* = 2.22. We use visual morphology and spectral classification of subsamples of 287 and 500 galaxies, respectively, to show that the two peaks correspond… 

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