Astron. Astrophys. 361, 671-684 (2000)

The molecular outflows in NGC 1333

L.B.G. Knee ¹ and G. Sandell <sup>2

1</sup> National Research Council of Canada, Herzberg Institute of Astrophysics, Dominion Radio Astrophysical Observatory, 717 White Lake Road, Penticton BC V2A 6K3, Canada (lewis.knee@hia.nrc.ca)
² National Radio Astronomy Observatory ^*, P.O. Box 2, Green Bank WV 24944, USA (gsandell@nrao.edu)

Received 17 February 2000 / Accepted 11 April 2000

Abstract

We present the results of mapping using the James Clerk Maxwell Telescope of the active star formation region NGC 1333, supplemented by mapping from the Onsala Space Observatory millimetre telescope. These maps provide a detailed overview of the complex cluster of overlapping molecular outflows associated with Herbig-Haro (HH) objects and shocked H₂, and the far-infrared and submillimetre sources that drive these outflows. We identify about ten molecular outflows and in most cases their driving source. Many of the outflow-driving stars are confirmed or probable Class 0 protostellar objects which drive highly collimated CO jets.

We identify HH 12 as the leading bow shock of a large outflow driven by SSV 13 B with an orientation close to the plane of the sky.

The present rate of energy injection into molecular gas by the outflows, if maintained over a time scale , appears sufficient to disperse the entire NGC 1333 cloud. On the shorter time scale of the current generation of star forming activity (), it appears that the star forming core has been broken up by the outflows into a number of low-density shells with star formation activity confined to dense ridges on their periphery.

Key words: stars: formation stars: pre-main sequence ISM: individual objects: NGC 1333 ISM: kinematics and dynamics ISM: molecules

* The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations
• 3. Overview
• 4. The molecular outflows
  • 4.1. NGC 1333-IRAS 2
  • 4.2. An outflow from NGC 1333-IRAS 2 B?
  • 4.3. NGC 1333-IRAS 3
    • 4.3.1. SSV 13 and HH 7-11
    • 4.3.2. SSV 13 B, the exciting star of HH 12
    • 4.3.3. H₂O(B) and the southern dust shell
  • 4.4. NGC 1333-IRAS 7 and HH 6
  • 4.5. NGC 1333-IRAS 6 and HH 12
  • 4.6. NGC 1333-IRAS 4
• 5. Discussion
  • 5.1. Physical parameters
  • 5.2. Global effects of the outflows
  • 5.3. Local effects of the outflows
• 6. Summary
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: October 2, 2000
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