Astron. Astrophys. 355, 639-650 (2000)

Giant protostellar outflows revealed by infrared imaging

Th. Stanke  ^** , M.J. McCaughrean and H. Zinnecker

Astrophysikalisches Institut Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany

Received 10 October 1999 / Accepted 10 December 1999

Abstract

We present new infrared data from a survey for embedded protostellar jets in the Orion A cloud. This survey makes use of the S(1) -0 line of molecular hydrogen at µm to search for infrared jets deep inside the cloud and thus hidden from view at optical wavelengths. We present data on the three flows associated with the Herbig-Haro objects HH 43/38 & HH 64, HH 65, and the L1641-N giant flow. HH 43, HH 38 and HH 64 are part of one H₂ flow extending over at least 1.4 pc. We identify a deeply embedded 1.3 mm and IRAS source (HH 43 MMS1 = IRAS 05355-0709C) as the likely driving source, while the infrared source previously assumed to drive HH 43/38 (HH 43-IRS1 = IRAS 05357-0710) is seen to drive a smaller jet. The morphology of HH 43-IRS1 suggests that it is a star+disk system seen close to edge-on. We identify another large H₂ flow apparently comprising the L1641-S3 CO outflow and the redshifted lobe of the L1641-S CO outflow containing HH 65. This flow extends over at least 2.6 pc and appears strongly curved. It is driven by L1641-S3 IRS, a deeply embedded 1.3 mm and IRAS source (L1641-S3 MMS1 = IRAS 05375-0731). Finally, we have found some additional large H₂ features to the east of V 380 Ori and the HH 1/2 system, which probably outline another part of the L1641-N outflow. The molecular flow MB 20/21, which extends to the south from V 380 Ori, also appears to be a part of the L1641-N outflow.

Key words: ISM: jets and outflows stars: formation stars: circumstellar matter infrared: ISM: lines and bands

* Visiting Astronomer, German-Spanish Astronomical Centre, Calar Alto operated by the Max-Planck-Institute for Astronomy, Heidelberg, jointly with the Spanish National Commission for Astronomy
** Now at Max-Planck-Institut für Radioastronomie Bonn, Auf dem Hügel 69, 53121 Bonn, Germany

Send offprint requests to: T. Stanke (tstanke@mpifr-bonn.mpg.de)

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations
• 3. The HH 43/38 outflow
  • 3.1. Previous studies
  • 3.2. New observational results
  • 3.3. Discussion
• 4. The L1641-S and L1641-S3 flow
  • 4.1. Previous studies
  • 4.2. New observational results
  • 4.3. Discussion
• 5. The L1641-N outflow
• 6. Summary and conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: March 9, 2000
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