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Dependence of the U-B and B-V colors of quasars and Seyfert galaxies on their redshifts

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Abstract

We show that the strong emission lines(Mg II, C III, C IV, and Lyα and the absorption lineO VI (1035 A) of quasars, when passed through the maximum transmission ofU, B, V, andR light filters, leads to a continuous, and sometimes periodic variation in the dependence ofU-B onB-V. The correlation between the(U-B) and(B-V) colors in quasars with z<1.5 is expressed by the relation(U-B)=−0.92+1.15(B-V). We also give the dependence ofU-B onB-V for Seyfert galaxies of typeS1. We determine the mean variation of the(U-B, B-V) colors due to the strongest emission lines (Mg II, C IV, Lyα). It amounts to magnitude0 m. 15.

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Authors
  1. R. A. Vardanyan
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Translated fromAstrofizika, Vol. 38, No. 2, 1995.

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Vardanyan, R.A. Dependence of the U-B and B-V colors of quasars and Seyfert galaxies on their redshifts. Astrophysics 38, 137–144 (1995). https://doi.org/10.1007/BF02048588

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  • DOI: https://doi.org/10.1007/BF02048588

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