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Mon. Not. R. Astron. Soc. 339, 524536 (2003) Anatomy of the HerbigHaro object HH7 bow shock
 

Summary: Mon. Not. R. Astron. Soc. 339, 524­536 (2003)
Anatomy of the Herbig­Haro object HH7 bow shock
Michael D. Smith,1
Tigran Khanzadyan1
and Christopher J. Davis2
1Armagh Observatory, Armagh, Northern Ireland, BT61 9DG
2Joint Astronomy Centre, 660 N. A'ohŻokŻu Place, University Park, Hilo, Hawaii 96720, USA
Accepted 2002 October 18. Received 2002 October 3; in original form 2002 August 21
ABSTRACT
We perform a detailed shock diagnosis of the Herbig­Haro object HH7, a well-defined bow
shock from a protostellar outflow. We first present molecular hydrogen images in the 2­1
S(1) and 1­0 S(1) K-band emission lines. We then introduce revised models for magneto-
hydrodynamic bow shocks that incorporate a limited C and O chemistry and account for the
shock thickness. We employ these models to interpret the new images as well as ISO data, the
line profile, H2 position­velocity diagram, optical images and the proper motion. This yields a
C-shock model that satisfies the constraints, confirming that ambipolar diffusion is the linchpin
in the shock physics. The best model is a slow-moving paraboloidal bow of speed 55 km s-1
,
with a pre-shock density of 8 × 103
cm-3

  

Source: Armagh Observatory

 

Collections: Physics