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Astron. Astrophys. 322, L25-L28 (1997)


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Letter to the Editor

High resolution observations of molecular outflows in the HH 1-2 region

J.C. Correia 1, M. Griffin 1 and P. Saraceno 2

1 Physics Department, Queen Mary & Westfield College, Mile End Road, London E1 4NS, UK
2 CNR - Istituto di Fisica dello Spazio Interplanetario, CP 27, I-00044 Frascati, Italy

Received 11 March 1997 / Accepted 25 March 1997

Abstract

We report 12 CO J [FORMULA] 3-2 high resolution observations of compact molecular outflows around VLA 1 and VLA 3, two young stellar objects in the HH 1-2 region. We have confirmed the existence of a new outflow associated with VLA 1, the powering source of these well known Herbig-Haro objects. The VLA 1 outflow exhibits red- and blue-shifted peaks with a separation of only [FORMULA]. The two lobes are clearly distinct from each other, suggesting that the out flow axis is close to the plane of the sky. The outflow is aligned with the HH 1-2 axis, but the lobes are inside the HH knots. Our calculations have shown that this outflow is one of the weakest, youngest and most compact ever seen. Its total mass is 1.1 [FORMULA] [FORMULA] and the dynamical timescale is [FORMULA] 1 [FORMULA] years. We have also mapped the more extended outflow from VLA 3 confirming the existence of two young, distinct and very compact molecular outflo ws in this region.

Key words: Stars: formation – Stars: pre-main sequence – ISM: individual objects: HH 1 – 2 – ISM: jets and outflows

Send offprint requests to: J.C.Correia@qmw.ac.uk

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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