A textbook case of bow shock entrainment in a YSO outflow

Details A textbook case of bow shock entrainment in a YSO outflow A textbook case of bow shock entrainment in a YSO outflow

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.299..825d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 299, Issue 3, pp. 825-833.

Astronomy and Astrophysics

Astronomy

24

Circumstellar Matter, Ism: Individual: W75N, Ism: Jets And Outflows, Ism: Kinematics And Dynamics, Infrared: Ism: Lines And Bands, Infrared: Stars

Scientific paper

Near-infrared images in H_2 line emission and submillimetre maps in CO J=3-2 emission illustrate the remarkable association between a molecular bow shock and the redshifted molecular outflow lobe in W75N. The flow lobe fits perfectly into the wake of the bow, as one would expect if the lobe represented swept-up gas. Indeed, these observations strongly support the `bow shock' entrainment scenario for molecular outflows driven by young stars. The characteristics of the bow shock and CO outflow lobe are compared with those of numerical simulations of jet-driven flows. These models successfully reproduce the bulge and limb-brightening in the CO outflow, although the model H_2 bow exhibits more structure extending back along the flow axis. We also find that the size of the flow, the high mass fraction in the flow at low outflow velocities (low gamma values) and the high CO/H_2 luminosity ratio indicate that the system is evolved. We also predict a correlation, in evolved systems, between outflow age and the CO/H_2 luminosity ratio.

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