Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.105..215w&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 105, no. 2, Oct. 1984, p. 215-226.
Astronomy and Astrophysics
Astronomy
3
Background Radiation, Carbon, Cosmology, Infrared Absorption, Quasars, Red Shift, Absorption Spectra, Millimeter Waves, Optical Thickness, Radio Astronomy
Scientific paper
A method for the determination of the background radiation temperature in earlier cosmological epochs at redshifts z > 2 is discussed in detail. The method is based on the fact that in the clouds situated in cosmological distances at redshift z 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 transition 3P0-3P1 of C I (λ = 610 μ) for the measurement of the background radiation temperature. At z > 2 this absorption line shifts to the millimeter radio region and can be observed by radioastronomical methods.
Khersonskii V. K.
Waltz I. E.
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