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Astron. Astrophys. 332, 714-720 (1998)

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Working surfaces in radiative, non-top hat jets

A.C. Raga 1, J. Cantó 1 and S. Cabrit 2

1 Instituto de Astronomía, UNAM, Ap. 70-264, 04510 D.F., México
2 Observatoire de Paris, DEMIRM, URA 336 du CNRS, 61 Avenue de l'Observatoire, F-75014 Paris, France

Received 18 August 1997 / Accepted 18 December 1997


Most models of radiative jets have been computed for the special case of a top hat initial cross section. This paper discusses the dynamics of both leading and internal working surfaces in jets with more general initial cross sections, based on both an analytic, "thin shell" model, and on a full numerical simulation. We find that a non-top hat cross section for the jet ram pressure first leads to a strong curvature of the working surface shocks, and at longer timescales to the formation of a warm, dense "nose cone". These results have interesting implications for comparisons between radiative jet models and observations of Herbig-Haro objects.

Key words: ISM: jets and outflows – hydrodynamics – shock waves – methods: analytical

Send offprint requests to: A.C. Raga

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© European Southern Observatory (ESO) 1998

Online publication: March 23, 1998