The ortho:para-H_2 ratio in C- and J-type shocks

Details The ortho:para-H_2 ratio in C- and J-type shocks The ortho:para-H_2 ratio in C- and J-type shocks

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...356.1010w&link_type=abstract

Astronomy and Astrophysics, v.356, p.1010-1022 (2000)

Astronomy and Astrophysics

Astrophysics

51

Magnetohydrodynamics (Mhd), Molecular Processes, Shock Waves, Ism: Individual Objects: Hh 54, Ism: Molecules, Infrared: Ism: Lines And Bands

Scientific paper

We have computed extensive grids of models of both C- and J-type planar shock waves, propagating in dark, cold molecular clouds, in order to study systematically the behaviour of the ortho:para-H_2 ratio. Careful attention was paid to both macroscopic (dynamical) and microscopic (chemical reactions and collisional population transfer in H_2) aspects. We relate the predictions of the models to observational determinations of the ortho:para-H_2 ratio using both pure rotational lines and rovibrational lines. As an illustration, we consider ISO and ground-based H_2 observations of HH 54. Neither planar C-type nor planar J-type shocks appear able to account fully for these observations. Given the additional constraints provided by the observed ortho:para H_2 ratios, a C-type bowshock, or a C-type precursor followed by a J-type shock, remain as plausible models. Tables~2a-f and 4a-f are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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