Oxygen chemistry of shocked interstellar clouds. III. Sulfur and oxygen species in dense clouds

Journal Article · Mon Feb 01 04:00:00 EST 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/166013· OSTI ID:7251425

Leen, T M; Graff, M M

The chemical evolution of oxygen and sulfur species in shocked dense clouds is studied. Reaction rate constants for several important neutral reactions are examined, and revised values are suggested. The one-fluid magnetohydrodynamic shock structure and postshock chemical evolution are calculated for shocks of velocity v(s) = 10 km/s through clouds of initial number density n(0) = 100,000/cu cm and of molecule/atom ratios H/sub 2//H = 10, 1000, and 100,000 with most sulfur contained initially in molecules SO/sub 2/ and SO. Abundances of SO/sub 2/, SO, CS, and OCS remain near their preshock values, except in clouds containing substantial amounts of atomic hydrogen, where significant destruction of sulfur-oxygen species occurs. Abundances of shock-enhanced molecules HS and H/sub 2/O are sensitive to the molecule/atom ratio. Nonthermal oxygen-hydrogen chemistry has a minor effect on oxygen-sulfur molecules in the case H/sub 2//H = 10. 23 references.

• Research Organization: Oregon Univ., Eugene (USA)
• OSTI ID: 7251425
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 325; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
COSMIC GASES
COSMOCHEMISTRY
ELEMENTS
FLUIDS
GASES
HYDROGEN COMPOUNDS
INTERSTELLAR SPACE
KINETICS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
SHOCK WAVES
SPACE
SULFUR
SULFUR COMPOUNDS
SULFUR OXIDES
WATER