Ambipolar Diffusion and X-ray Heating of the X-wind Jet

Details Ambipolar Diffusion and X-ray Heating of the X-wind Jet Ambipolar Diffusion and X-ray Heating of the X-wind Jet

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.2802g&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #28.02; Bulletin of the American Astronomical Society, Vol. 33, p.824

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Ambipolar diffusion and X-ray interactions have the potential to heat the inner part (or jet) of the X-wind. We have recalculated the ambipolar diffusion coupling coefficient for atomic regions (where H+ is the dominant ion) using recently calculated cross sections by Krstíc and Schultz and by others. The coefficient for hot regions (T ≈ 104 K) is an order of magnitude larger than the values used in the past because the short-range part of the H-H+ interaction (including exchange effects) is larger than previously assumed. Consequently ambipolar diffusion plays only a minor role in heating the inner part of the X-wind and very likely in YSO jets in general. We also find that X-ray heating is enhanced in atomic regions through the significant probability for populating excited levels of the H atom in collisions with X-ray induced secondary electrons (e.g., Dalgarno, Yan, and Liu 1999). The standard Lyman-alpha cooling must then be reduced by an amount that can be greater than direct collisional X-ray heating. The excess population in the n = 2 level leads to heating by collisional de-excitation in the presence of trapped Lyman-alpha line radiation. However, even with this enhancement, X-ray heating is usually less important than the main heating mechanism for the inner X-wind, which involves the dissipation of shock and turbulent energy. This research has been supported in part by the NSF.

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