The spectrum of fossil He I and He II recombination lines

Details The spectrum of fossil He I and He II recombination lines The spectrum of fossil He I and He II recombination lines

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..565d&link_type=abstract

Astronomy Letters, Volume 23, Issue 5, September 1997, pp.565-572; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 643

Astronomy and Astrophysics

Astronomy

17

Scientific paper

We consider the formation of spectral disturbances of cosmic microwave background (CMB) radiation at the epoch of helium recombination at redshifts z ~ 2700 and z ~ 6000 with special emphasis on the decimeter-wavelength range. It is shown that, depending on the set of cosmological parameters, the amplitude of the disturbances of the Planck CMB spectrum, delta T/TCMB, due to the He III and He II recombinations at decimeter wavelengths can reach 10^-6 and 3 x 10^-7, respectively.

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