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

Iskra Strateva, Željko Ivezić, Gillian R. Knapp, Vijay K. Narayanan, Michael A. Strauss, James E. Gunn, Robert H. Lupton, David Schlegel, Neta A. Bahcall, Jon Brinkmann, Robert J. Brunner, Tamás Budavári (+17 others)
2001 Astronomical Journal  

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2001 pre-print
arXiv:astro-ph/0107201v1 fatcat:y5f7nxdmkjfyno5kci6f2ipzoa
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 sq. deg. of high Galactic latitude sky along the Celestial Equator. The distribution of galaxies in the g*-r* vs. 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
more » ... ghly to early (E, S0, Sa) and late (Sb, Sc, Irr) type galaxies, as expected from their different stellar populations. We also find that the colors of galaxies are correlated with their radial profiles, as measured by the concentration index and by the likelihoods of exponential and de Vaucouleurs' profile fits. While it is well known that late type galaxies are bluer than early type galaxies, this is the first detection of a local minimum in their color distribution. In all SDSS bands, the counts vs. apparent magnitude relations for the two color types are significantly different, and indicate that the fraction of blue galaxies increases towards the faint end.
doi:10.1086/323301 fatcat:uhzv2b3ec5hwrog3wn6ffyil5y
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Iskra Strateva, Željko Ivezić, Gillian R. Knapp, Vijay K. Narayanan, Michael A. Strauss, James E. Gunn, Robert H. Lupton, David Schlegel, Neta A. Bahcall, Jon Brinkmann, Robert J. Brunner, Tamás Budavári, István Csabai, Francisco Javier Castander, Mamoru Doi, Masataka Fukugita, Zsuzsanna Győry, Masaru Hamabe, Greg Hennessy, Takashi Ichikawa, Peter Z. Kunszt, Don Q. Lamb, Timothy A. McKay, Sadanori Okamura, Judith Racusin, Maki Sekiguchi, Donald P. Schneider, Kazuhiro Shimasaku, Donald York. "Color Separation of Galaxy Types in the Sloan Digital Sky Survey Imaging Data." Astronomical Journal 122.4 (2001) 1861-1874