Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 478, Issue 2, Pages 1811-1817Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1177
Keywords
astrochemistry; molecular data; molecular processes; scattering; ISM: molecules
Categories
Funding
- Programme National 'Physique et Chimie du Milieu Interstellaire' (PCMI) of CNRS/INSU
- INC/INP
- CEA
- CNES
- CONI-CYT/FONDECYT/INICIACION [11160005]
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Astronomers use the CS molecule as a gas mass tracer in dense regions of the interstellar medium, to measure either the gas density through multiline observations or the level of turbulence. This necessarily requires the knowledge of the rates coefficients with the most common colliders in the interstellar medium, He and H-2. In this work, the close coupling collisional rates are computed for the first 30 rotational states of CS in collision with paraand ortho-H-2 using a recent rigid rotor potential energy surface. Some radiative transfer calculations, using typical astrophysical conditions, are also performed to test this new set of data and to compare with the existing ones.
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