180 citations · 1k across the 27 of their papers we have counts for
10 papers · 1 filter
HeII->HeI Recombination of Primordial Helium Plasma Including the Effect of Neutral Hydrogen
E. E. Kholupenko, A. V. Ivanchik, D. A. Varshalovich
The HeII->HeI recombination of primordial helium plasma (z = 1500 - 3000) is considered in terms of the standard cosmological model. This process affects the formation of cosmic mi…
Rapid HeII->HeI recombination and radiation concerned with this process
E. E. Kholupenko, A. V. Ivanchik, D. A. Varshalovich
Recombination of the primordial helium plasma (HeII->HeI, ) is considered. This process has an effect on the CMBR anisotropy and CMBR spectrum distortion. In…
The redshift distribution of absorption-line systems in QSO spectra
A. I. Ryabinkov, A. D. Kaminker, D. A. Varshalovich
A statistical analysis of the space-time distribution of absorption-line systems (ALSs) observed in QSO spectra within the cosmological redshift interval =0.0--3.7 is carried ou…
CMBR distortion concerned with recombination of the primordial hydrogen plasma
E. E. Kholupenko, A. V. Ivanchik, D. A. Varshalovich
CMBR distortion concerned with recombination of the primordial plasma is calculated in frequency band from 1 GHz to 100 GHz in the frame of the standard cosmological model for diff…
A new constraint on the time dependence of the proton-to-electron mass ratio. Analysis of the Q 0347-383 and Q 0405-443 spectra
A. Ivanchik, P. Petitjean, D. Varshalovich +5
A new limit on the possible cosmological variation of the proton-to-electron mass ratio μ=m_p/m_e is estimated by measuring wavelengths of H_2 lines of Lyman and Werner bands from…
Positron annihilation spectrum from the Galactic Center region observed by SPI/INTEGRAL
E. Churazov, R. Sunyaev, S. Sazonov +2
The electron-positron annihilation spectrum observed by SPI/INTEGRAL during deep Galactic Center region exposure is reported. The line energy (510.9540.075 keV) is consistent…