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Astron. Astrophys. 346, 278-284 (1999)

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Hot molecular bullets in HH 111 and Cep E

J. Hatchell 1, G.A. Fuller 1 and E.F. Ladd 2

1 Department of Physics, UMIST, P.O. Box 88, Manchester M60 1QD, UK
2 Department of Physics, Bucknell University, Lewisburg, PA 17837, USA

Received 19 November 1998 / Accepted 6 March 1999


Many protostellar outflows show high velocity molecular bullets, in addition to a low velocity molecular outflow and shocked H2 knots. The velocities of these bullets suggets that they are closely related to the protostellar wind. We demonstrate from 12CO 4-3 and lower-J 12CO and 13CO observations that the CO bullets are hot, as expected for actively shocked molecular material. This upwardly revised temperature estimate implies that the bullets are more massive than was previously considered. The high masses have consequences for models of the origin of the bullets. They cannot consist of locally swept up material; they can form of material swept up along their path only if that path is much longer than the distance between the bullets; alternatively, if they consist of jet material then the jet must have a density of [FORMULA].

Key words: stars: formation – ISM: Herbig-Haro objects – ISM: individual objects: Cep E; HH 111 – ISM: jets and outflows – ISM: kinematics and dynamics

Send offprint requests to: J.Hatchell@umist.ac.uk

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© European Southern Observatory (ESO) 1999

Online publication: May 6, 1999