EDP Sciences
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Volume 390, Number 1, July IV 2002
Page(s) L5 - L9
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20020890

A&A 390, L5-L9 (2002)
DOI: 10.1051/0004-6361:20020890


A twisted jet from R Mon

T. A. Movsessian1, T. Yu. Magakian1 and V. L. Afanasiev2

1  Byurakan Astrophysical Observatory, Aragatsotn prov., 378433 Armenia and Isaac Newton Institute of Chile, Armenian Branch
    e-mail: tigmag@sci.am
2  Special Astrophysical Observatory, N.Arkhyz, Karachaevo-Cherkesia, 369167, Russia
    e-mail: vafan@sao.ru

(Received 2 April 2002 / Accepted 11 June 2002)

We present the results of long-slit and integral-field spectroscopy of the R Mon Herbig-Haro jet. The data were obtained with the 6 m telescope. A slightly curved jet of 16´´ in length is evident in [ $\ion{S}{ii}$] lines. Maps of radial velocities and electron densities are shown. The difference between radial velocities on the sides of the jet as well as the density distribution can be considered as an indication of presence of the helical shock structure in the jet. This structure, having a DNA-like appearance, abruptly changes direction near the edges, which could account for the observed velocity variations. Radial velocities were determined also for the several knots in the HH 39 group. The kinematics of the system as a whole also suggests the precession of the outflow.

Key words: ISM: individual objects: R Mon -- jets and outflows -- kinematics and dynamics

Offprint request: T. A. Movsessian, tigmov@bao.sci.am

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