The impact of new collisional rates on the water emission

Details The impact of new collisional rates on the water emission The impact of new collisional rates on the water emission

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..241c&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

The interpretation of water emission from current observations and future Herschel/HIFI data requires a detailed knowledge of collisional rate coefficients. The rotational (de)excitation of H2O by H2 molecules is one of the most relevant collisional processes in interstellar and circumstellar media. We have recently computed quasi-classical rate coefficients for all transitions among the lowest 45 para and 45 ortho rotational levels of H2O colliding with both para and ortho H2 in the temperature range 20-2000 K. By comparison with quantum calculations, classical rates are found to be accurate within a factor of 1-3 for the dominant transitions. Large velocity gradient modelling shows that these new rates have a significant impact on water emission line fluxes.

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