Journal Article

L 43: the late stages of a molecular outflow

S.J. Bence, R. Padman, K.G.. Isaak, M.C. Wiedner and G.S. Wright

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 299, issue 4, pages 965-976
Published in print October 1998 | ISSN: 0035-8711
Published online October 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01789.x
L 43: the late stages of a molecular outflow

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Our new 21‐arcsec resolution CO J = 2 → 1 map of the L 43 dark cloud shows a poorly collimated molecular outflow, with little evidence for wings at velocities 10 km s−1. The outflow appears not to be currently driven by a jet: its structure can instead be modelled as a slowly expanding shell. The shell may be compressed either by a wide‐angled wind catching up with an existing shell (as in the case of planetary nebulæ), or by the thermal pressure of a hot low‐emissivity medium interior to the shell. The outflow is most probably in a late stage of evolution, and appears to be in the process of blowing away its molecular cloud. We also present a 45‐arcsec resolution CO J = 1 → 0 map of the whole molecular cloud, showing that the outflow structure is clearly visible even in the integrated intensity of this low excitation line, and suggesting that rapid mapping may prove useful as a way of finding regions of outflow activity. We also examine the immediate surroundings of the driving source with 450 μm imaging: this confirms that the outflow has already evacuated a bay in the vicinity of the young stellar object.

Keywords: stars: formation; stars: mass‐loss; ISM: individual: L43; ISM: jets and outflows; ISM: kinematics and dynamics

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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