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Astron. Astrophys. 332, 307-313 (1998)

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First results of an unbiased H2 survey for protostellar jets in Orion A

Thomas Stanke * 1, Mark J. McCaughrean 2 and Hans Zinnecker 1

1 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany (tstanke@aip.de, hzinnecker@aip.de)
2 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany (mjm@mpifr-bonn.mpg.de)

Received 12 August 1997 / Accepted 12 December 1997

Abstract

We are conducting an unbiased search at [FORMULA] 2.12µm for embedded molecular hydrogen jets thought to be associated with very young stellar objects, deeply embedded in dense cores in the Orion A molecular cloud. As a first result, we show a 0.4 [FORMULA] 0.5 degree mosaic centred on the L 1641-N complex, revealing a number of previously unknown knots and chains of H2 emission. A 5 [FORMULA] 5 arcmin close-up of L 1641-N shows it to be a very active region, with at least one parsec-scale jet originating in the small embedded cluster: we also show 10µm imaging to help identify the outflow source. Elsewhere in the mosaic, several knots in the HH 34 jet are detected for the first time in H2, and a new, deeply embedded jet is discovered next to it. These preliminary results demonstrate the power of H2 imaging surveys in studying the large-scale role of jets and outflows in star formation.

Key words: ISM: jets and outflows – infrared: ISM: lines and bands – stars: formation – ISM: individual objects: L 1641-North – ISM: individual objects: HH 34

* 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

Send offprint requests to: T. Stanke

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© European Southern Observatory (ESO) 1998

Online publication: March 10, 1998
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