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A possibility to useCi infrared absorption lines for determination of the background radiation temperature at earlier cosmological epochs

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Abstract

A method for the determination of the background radiation temperature in earlier cosmological epochs at redshiftsz>2 is discussed in detail. The method is based on the fact that in the clouds situated at cosmological distances at redshiftz the background radiation temperature must be (1+z) times more than in the modern epoch (z=0). This shall affect the level populations of the atoms, ions and molecules and, consequently, the parameters of the absorption lines observed in quasar absorption spectra. It is proposed to use the transition3 P 0−3 P 1 ofCi (λ=610 μ) for the measurement of the background radiation temperature. Atz>2 this absorption line shifts to the millimeter radio region and can be observed by radioastronomical methods.

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Authors and Affiliations

  1. Space Research Institute of the USSR Academy of Sciences, Moscow, U.S.S.R.

    I. E. Waltz & V. K. Khersonskij

  2. Leningrad Department of the Special Astrophysical Observatory of the USSR Academy of Sciences, Pulkovo, Leningrad, U.S.S.R.

    V. K. Khersonskij

Authors
  1. I. E. Waltz
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  2. V. K. Khersonskij
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Waltz, I.E., Khersonskij, V.K. A possibility to useCi infrared absorption lines for determination of the background radiation temperature at earlier cosmological epochs. Astrophys Space Sci 105, 215–226 (1984). https://doi.org/10.1007/BF00651075

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  • DOI: https://doi.org/10.1007/BF00651075

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