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Title:
The Orion nebula (M42) Herbig-Haro object, HH 201, within the tip of a molecular finger
Authors:
Graham, M. F.; Meaburn, J.; Redman, M. P.
Affiliation:
AA(Jodrell Bank Observatory, Department of Physics and Astronomy, University of Manchester, Macclesfield, Cheshire SK11 9DL), AB(Jodrell Bank Observatory, Department of Physics and Astronomy, University of Manchester, Macclesfield, Cheshire SK11 9DL), AC(Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT)
Publication:
Monthly Notice of the Royal Astronomical Society, Volume 343, Issue 2, pp. 419-426. (MNRAS Homepage)
Publication Date:
08/2003
Origin:
MNRAS
MNRAS Keywords:
line: profiles, stars: winds, outflows, ISM: Herbig, Haro objects, ISM: individual: HH 201, ISM: jets and outflows, infrared: ISM
DOI:
10.1046/j.1365-8711.2003.06692.x
Bibliographic Code:
2003MNRAS.343..419G

Abstract

The most prominent Herbig-Haro (HH) object, HH 201, in the Orion nebula is investigated using optical spectroscopy along with optical and infrared images. An infrared Subaru H2v= 1-0 S(1) image of the region surrounding the optical line emission of HH 201 has yielded the discovery of a faint H2 finger associated with HH 201. The H2 finger is seen to share a common width and orientation with the optical line emission. Therefore, it is unlikely that the association is caused by a chance superposition along the line of sight. The finger is found to precede the optical line emission, which is inconsistent with this H2 emission being produced within a bowshock. The origin of this finger is discussed in the context of the current understanding of HH objects and the Orion molecular fingers.

Multi-epoch HST[S II] 6716- and 6731-Å images are used to measure the proper motions of the various knots present in the filamentary structure of HH 201. Tangential velocities of between 40 and 178 km s-1 are found. Two new knots with associated proper motions are found in the wake of HH 201 and the general structure of the tangential flow is shown by means of a multi-epoch difference image.

[S II] 6716- and 6731-Å spectra taken with the RGO spectrograph are used to spectroscopically resolve the velocity profile of HH 201 into distinct components with radial velocities of between -267 and -9 km s-1. Using the [S II] 6716- and 6731-Å line ratios, the local electron density of gas at the various velocities is found to be between 830 and 12 200 cm-3. Combining radial and tangential velocities, the angle between the direction of motion and the line of sight is found to be approximately 30°. Assuming that the emission knots and velocity components correspond to condensations in a bowshock, a shock velocity at the head of HH 201 of 295 km s-1 is established. Using this combination of optical and infrared data, the morphology and kinematics of HH 201 and its immediate environs are elucidated.

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