Anatomy of the Herbig-Haro object HH7 bow shock

Smith, M.D. and Khanzadyan, T. and Davis, C.J. (2003) Anatomy of the Herbig-Haro object HH7 bow shock. Monthly Notices of the Royal Astronomical Society, 339 (2). pp. 524-536. ISSN 0035-8711. (doi:https://doi.org/10.1046/j.1365-8711.2003.06195.x) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1046/j.1365-8711.2003.06195.x

Abstract

We perform a detailed shock diagnosis of the Herbig-Haro object HH7, a well-defined bow shock from a protostellar outflow. We first present molecular hydrogen images in the 2-1 S(1) and 1-0 S(1) A-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, H 2 position-velocity 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 and an H2/H number ratio of just 0.25. The bow moves at an angle of ∼30° to the line of sight and at a position angle of ∼95° in the plane of the sky rather than along the outflow axis of ∼123°. The bow model also predicts the observed low line emission from H2O, without the need for gas-phase depletion. Predictions for imaging and spectroscopy at far-infrared wavelengths, employing the 63-μm [OI] line, are presented.

Item Type: Article
Uncontrolled keywords: ISM: Herbig-haro objects, ISM: individual: HH7, ISM: jets and outflows, ISM: lines and bands, ISM: structure
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 11 Aug 2015 09:58 UTC
Last Modified: 12 Aug 2015 14:18 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50128 (The current URI for this page, for reference purposes)
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