Quantum Calculation of Inelastic CO Collisions with H. III. Rate
  Coefficients for Ro-vibrational Transitions
  We present calculated rate coefficients for ro-vibrational transitions of CO
in collisions with H atoms for a gas temperature range of 10 K $\leq T \leq$
3000 K, based on the recent three-dimensional ab initio H-CO interaction
potential of Song et al(2013). Rate coefficients for ro-vibrational $v=1,j=0-30
\rightarrow v'=0, j'$ transitions were obtained from scattering cross sections
previously computed with the close-coupling method by Song et al(2015).
Combining these with the rate coefficients for vibrational $v=1-5 \rightarrow
v' < v$ quenching obtained with the infinite-order sudden approximation, we
propose a new extrapolation scheme that yields the rate coefficients for
ro-vibrational $v=2-5,j=0-30 \rightarrow v',j'$ de-excitation. Cross sections
and rate coefficients for ro-vibrational $v=2, j=0-30 \rightarrow v'=1,j'$
transitions calculated with the close-coupling method confirm the effectiveness
of this extrapolation scheme. Our calculated and extrapolated rates are very
different from those that have been adopted in the modeling of many
astrophysical environments. The current work provides the most comprehensive
and accurate set of ro-vibrational de-excitation rate coefficients for the
astrophysical modeling of the H-CO collision system. Application of the
previously available and new data sets in astrophysical slab models shows that
the line fluxes typically change by 20-70% in high temperature environments
(800 K) with an H/H$_2$ ratio of 1; larger changes occur for lower
temperatures.
