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RAS PhysicsАстрономический журнал Astronomy Reports

  • ISSN (Print) 0004-6299
  • ISSN (Online) 3034-5170

THE INFLUENCE OF VARIATIONS OF ELEMENTAL COMPOSITION OF A GAS ON THE MOLECULAR KINETICS

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PII
S3034517025120044-1
DOI
10.7868/S3034517025120044
Publication type
Article
Status
Published
Authors
O. P. Vorobyov
  • Affiliation: P. N. Lebedev Physical Institute of the Russian Academy of Sciences
E. O. Vasiliev
  • Affiliation: P. N. Lebedev Physical Institute of the Russian Academy of Sciences
Volume/ Edition
Volume 51 / Issue number 12
Pages
1095-1108
Abstract
The low efficiency of metal mixing in the interstellar gas preserves their spatial inhomogeneities for longer times. In this work, we study how the variations in the elemental composition affects the chemical evolution of the molecular gas, that cools down behind the supernovae shock fronts. We perform numerical simulations of the non-equilibrium chemical kinetics of a Lagrangian gas element experiencing the shockwaves travelling at 5–15 km/s velocities. We vary the chemical abundances of carbon and oxygen in range ±0.3 dex from the values typical for the ISM. We find significant differences in fractions of several molecular species, disproportionate with the variations in the abundances of the corresponding chemical elements. While these differences are remarkably higher than the variations of the given element abundances. We investigate how these changes in the molecular fractions depend on the properties of the gas, as well as on the external effects: gas density, ultraviolet flux, cosmic ray ionization rate and extinction. We find, for instance, that variations of oxygen abundance for δ[O/H] ~ ±0.3 dex of the Solar value, modify the water molecule fraction already by ~ 3–50 times. The differences are the most prominent for extinction values A ~ 0.3–3. We discuss the importance of these findings for chemical kinetics in star-forming regions.
Keywords
химическая кинетика молекулы ударные волны
Date of publication
10.03.2026
Year of publication
2026
Number of purchasers
0
Views
18

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