Collisional excitation of sulfur dioxide in cold molecular clouds

Details Collisional excitation of sulfur dioxide in cold molecular clouds Collisional excitation of sulfur dioxide in cold molecular clouds

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...531a.103c&link_type=abstract

Astronomy & Astrophysics, Volume 531, id.A103

Astronomy and Astrophysics

Astrophysics

5

Molecular Processes, Ism: Molecules, Ism: Abundances

Scientific paper

We present collisional rate coefficients for SO2 with ortho and para molecular hydrogen for the physical conditions prevailing in dark molecular clouds. Rate coefficients for the first 31 rotational levels of this species (energies up to 55 K) and for temperatures between 5 and 30 K are provided. We have found that these rate coefficients are about ten times more than those previously computed for SO2 with helium. We calculated the expected emission of the centimeter wavelength lines of SO2. We find that the transition connecting the metastable 202 level with the 111 one is in absorption against the cosmic background for a wide range of densities. The 404-313 line is found to be inverted for densities below a few 104 cm-3. We observed the 111-202 transition with the 100 m Green Bank Telescope towards some dark clouds. The line is observed, as expected, in absorption and provides an abundance of SO2 in these objects of a few 10-10. The potential use of millimeter lines of SO2 as tracers of the physical conditions of dark clouds is discussed.
Tables 5 and 6 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A103

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