A universal ultraviolet–optical colour–colour–magnitude relation of galaxies★

@article{Chilingarian2011AUU,
  title={A universal ultraviolet–optical colour–colour–magnitude relation of galaxies★},
  author={Igor V. Chilingarian and I. Yu. Zolotukhin},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2011},
  volume={419},
  pages={1727-1739}
}
The bimodal galaxy distribution in the optical colour–magnitude diagram (CMD) comprises a narrow ‘red sequence’ populated mostly by early-type galaxies and a broad ‘blue cloud’ dominated by star-forming systems. Although the optical CMD allows one to select red sequence objects, neither can it be used for galaxy classification without additional observational data such as spectra or high-resolution images, nor to identify blue galaxies at unknown redshifts. We show that adding the near… 

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