Collimation of Stellar Jets - Constraints from the Observed Spatial Structure - Part Two - Observational Results

Astronomy and Astrophysics – Astrophysics

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Herbig-Haro Objects, Hydrodynamics, Interstellar Medium: Kinematics And Dynamics Of, Stars: Mass Loss, Stars: Pre-Main-Sequence

Scientific paper

Using high quality CCD images and a deconvolution technique, we have analysed for a sample of 15 young stellar objects (YSOs) jets the changes in width, as a function of distance from their parent star. The studied jets and counterjets are associated with HH 30, HL Tau, VLA 1-HL Tau, L 1551-IRS 5, Haro 6-5 B, DG Tau B, HH 83, HH 24 C/E and HH 24 G. It is found that the flows are often poorly collimated close to the source (e.g., within a few hundred AU) with full opening angles in some cases of several tens of degrees. This has important consequences for all jet collimation models. However, on scales of the order of the jet lengths (103 - 104 AU) we usually observe a much higher degree of collimation. On these scales most jets show a monotonic decrease in opening angle with increasing distance from the source with typical full opening angles of 0.5 to 5°. The observations that jets in general become better collimated at large distances from their source clearly suggests that, in addition to any "local" collimation at (or near) the source, a very large scale collimation mechanism is at work as well, which is probably due to the jet's external environment. Environmental effects are probably also responsible for the observed strong asymmetries between the morphology of the jet and the counter- jet. Finally, the jets in our sample show a very large variety of spatial structures with the most unusual morphologies being observed in the case of the jets from L 1551-IRS 5 and Haro 6-5 B. In the former a narrow edge-brightened cavity is indicated, while for the latter the jet, after a section of strong expansion, narrows with increasing distance from the source presumably because of reconfinement.

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