75 citations · 744 across the 28 of their papers we have counts for
28 papers
Hyperfine transitions in atoms and rotational transitions in molecules of the early Universe as a possible source of CMB distortions
M. N. Golubev, P. A. Kislitsyn, A. V. Ivanchik
In the near future, measurements are expected to detect the influence of the hyperfine transition in the ground state of the hydrogen atom on the cosmic microwave background (CMB)…
SRG/eROSITA-SDSS view on the relation between X-ray and UV emission for quasars
S. A. Prokhorenko, S. Yu. Sazonov, M. R. Gilfanov +5
Motivated by the idea of using quasars as standardizable candles for cosmology, we examine the relation between X-ray (at 2 keV, ) and ultraviolet (at 2500 Angstrom,…
X-Ray Variability of SDSS Quasars Based on the SRG/eROSITA All-Sky Survey
S. A. Prokhorenko, S. Yu. Sazonov, M. R. Gilfanov +6
We examine the long-term (rest-frame time scales from a few months to years) X-ray variability of a sample of 2344 X-ray bright quasars from the SDSS DR14Q Catalogue, bas…
A New Precise Determination of the Primordial Abundance of Deuterium: Measurement in the metal-poor sub-DLA system at z=3.42 towards quasar J1332+0052
P. A. Kislitsyn, S. A. Balashev, M. T. Murphy +3
The theory of Big Bang nucleosynthesis, coupled with an estimate of the primordial deuterium abundance (D/H)_pr, offers insights into the baryon density of the Universe. Independen…
Estimation of the CMB temperature from atomic C\,{\sc i} and molecular CO lines in the interstellar medium of early galaxies
V. V. Klimenko, A. V. Ivanchik, P. Petitjean +2
The linear increase of the cosmic microwave background (CMB) temperature with cosmological redshift, , is a prediction of the standard cosmological CDM…
A new determination of the primordial helium abundance using the analyses of HII region spectra from SDSS
O. A. Kurichin, P. A. Kislitsyn, V. V. Klimenko +2
The precision measurement of the primordial helium abundance is a powerful probe of the early Universe. The most common way to determine is analyses of observations of…