Variation of QSO color indices with redshift

Fan Xiao-hui, Chen Jian-sheng

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


In this paper we discuss the effect of features in the spectrum of QSOs on their color indices and the consequent variation of the latter with the redshift. As the redshift increases, the various absorption features shortwards of the Lyα emission line enter into the visible region and alter the way in which the color indices vary with the redshift, while the effects of the intrinsic power-law spectrum and emission lines on the color indices become secondary. The largest effect is due to the Lyman limit absorption system. These results are checked using the color indices calculated from IUE spectra.

Original languageEnglish (US)
Pages (from-to)393-402
Number of pages10
JournalChinese Astronomy and Astrophysics
Issue number4
StatePublished - 1994


  • QSO-color indices-redshifts

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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