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Astron. Astrophys. 334, 269-279 (1998)


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Cores and cavities in NGC 1333

B. Lefloch 1, 2, A. Castets 2, J. Cernicharo 1, W.D. Langer 3 and R. Zylka 4

1 Consejo Superior de Investigaciones Científicas, Instituto de Estructura de la Materia, Departamento Física Molecular, Serrano 123,
E-28006 Madrid, Spain
2 Laboratoire d'Astrophysique, Observatoire de Grenoble, BP 53X, F-38041 Grenoble Cedex 9, France
3 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
4 Institut fu"r Theoretische Astrophysik (ITA), Universtität Heidelberg, Tiergartenstr. 15, D-69121 Heidelberg, Germany

Received 22 September 1997 / Accepted 10 February 1998

Abstract

We present 1.3mm continuum and CS [FORMULA] maps at [FORMULA] resolution of the NGC1333 star forming region. The area covered is [FORMULA]. The large-scale bolometer and CS maps delineate very nicely the large central cavity together with the cores situated in the surrounding compressed shell. In addition to the four dust cores IRAS4A-B, IRAS2 and SVS13, we discovered two fainter condensations, one of which is not associated with protostellar activity. All protostars are surrounded by extended low-emissivity envelopes and show indications of depletion of molecules onto grains. The continuum emission traces material entrained by the outflows powered by IRAS4A, IRAS2 and SVS13. The CS [FORMULA] is observed in all dust cores. Apart from IRAS4, the CS emission peak is shifted with respect to the dust continuum. The large-scale dust emission mostly comes from material compressed around two cavities, whose walls are detected in the H [FORMULA] S(1) v= 1-0 line. These cavities seem to have been excavated by outflows from the neighboring protostars IRAS4 and SVS13, and are now expanding in the ambient medium. Taken together these new data suggest that the large cavity in NGC1333 grows by local action of stars forming in the compressed edge, each producing a local cavity which eventually overlap.

Key words: ISM: individual objects: NGC 1333 – ISM: jets and outflows – ISM: molecules – radio continuum: ISM – radio lines: ISM – stars: formation

Send offprint requests to: Bertrand.Lefloch@obs.ujf-grenoble.fr

© European Southern Observatory (ESO) 1998

Online publication: May 12, 1998

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