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Molecular hydrogen absorption systems in Sloan Digital Sky Survey
S. A. Balashev, V. V. Klimenko, A. V. Ivanchik +3
We present a systematic search for molecular hydrogen absorption systems at high redshift in quasar spectra from the Sloan Digital Sky Survey (SDSS) II Data Release 7 and SDSS-III…
The Thermal Sunyaev-Zeldovich Effect of Primordial Recombination Radiation
E. E. Kholupenko, S. A. Balashev, A. V. Ivanchik +1
It is well known that recombination radiation of primordial hydrogen-helium plasma leads to the distortions of the planckian spectrum shape of the cosmic microwave background radia…
Influence of Gamma-Ray Emission on the Isotopic Composition of Clouds in the Interstellar Medium
V. V. Klimenko, A. V. Ivanchik, D. A. Varshalovich +1
We investigate one mechanism of the change in the isotopic composition of cosmologically distant clouds of interstellar gas whose matter was subjected only slightly to star formati…
Partial coverage of the Broad Line Region of Q1232+082 by an intervening H2-bearing cloud
S. A. Balashev, P. Petitjean, A. V. Ivanchik +4
We present a detailed analysis of the partial coverage of the Q1232+082 (z_em =2.57) broad line region by an intervening H_2-bearing cloud at z_abs=2.3377. Using curve of growth an…
HD/H2 Molecular Clouds in the Early Universe: The Problem of Primordial Deuterium
S. A. Balashev, A. V. Ivanchik, D. A. Varshalovich
We have detected new HD absorption systems at high redshifts, z_abs=2.626 and z_abs=1.777, identified in the spectra of the quasars J0812+3208 and Q1331+170, respectively. Each of…
HD molecules at high redshift: The absorption system at z=2.3377 towards Q 1232+082
A. V. Ivanchik, P. Petitjean, S. A. Balashev +4
We present a detailed analysis of the H_2 and HD absorption lines detected in the Damped Lyman-alpha (DLA) system at z_abs=2.3377 towards the quasar Q1232+082. We show that this in…
Effect of Radiative Feedbacks for Resonant Transitions during Cosmological Recombination
E. E Kholupenko, A. V. Ivanchik, D. A Varshalovich
The inhibition of the total HI transition rate by delayed resonant reabsorption of HI photons by HI line which is possible due to cosmolo…
Directional Radiation and Photodissociation Regions in Molecular Hydrogen Clouds
S. A. Balashev, D. A. Varshalovich, A. V. Ivanchik
Some astrophysical observations of molecular hydrogen point to a broadening of the velocity distribution for molecules at excited rotational levels. This effect is observed in both…