The Formation of H[2] in Variable Herbig-Haro Jets

Details The Formation of H[2] in Variable Herbig-Haro Jets The Formation of H[2] in Variable Herbig-Haro Jets

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005rmxaa..41..137r&link_type=abstract

Revista Mexicana de Astronomía y Astrofísica Vol. 41, pp. 137-146 (2005) (http://www.astroscu.unam.mx/~rmaa/)

Astronomy and Astrophysics

Astronomy

8

Ism: Herbig-Haro Objects, Ism: Jets And Outflows, Ism: Kinematics And Dynamics

Scientific paper

The chains of aligned knots that define the beams of HH jets are sometimes observed both in atomic/ionic as well as in molecular (H[2]) emission lines. We model such objects as jets with an ejection velocity time-variability, which produces internal working surfaces that travel down the jet beam. If this interpretation is indeed correct, then the presence of aligned H[2] knots is a sensitive indicator of the amplitude of the ejection velocity variability. We find that for variabilities with an amplitude of ~ 10-1, the internal working surfaces have appropriate conditions for H[2] to be formed (via negative and positive ion gas phase chemistry). We present axisymmetric gasdynamic+chemical numerical simulations which show that H[2] fractions as high as ~ 1-10% be obtained, and that the resulting H[2] 1-0 S(1) emission can be substantially larger than the Hα emission. From our study, we conclude that the H[2] emission observed in the chains of knots along some HH jets could correspond to molecules formed in situ within the internal working surfaces that travel down the jet flow.

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