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Astron. Astrophys. 364, 613-624 (2000)

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IRAS 12326-6245: Luminous very young stellar objects with a massive molecular outflow *

Th. Henning 1, A. Lapinov 2, K. Schreyer 1, B. Stecklum 4 and I. Zinchenko 2,3

1 Friedrich Schiller University Jena, Astrophysical Institute and University Observatory (AIU), Schillergässchen 2-3, 07745 Jena, Germany
2 Institute of Applied Physics of the Russian Academy of Sciences, 46 Uljanov str., 603600 Nizhny Novgorod, Russia
3 Helsinki University Observatory, Tähtitorninmäki, P.O. Box 14, 00014 University of Helsinki, Finland
4 Thuringian State Observatory, Sternwarte 5, 07778 Tautenburg, Germany

Received 20 March 2000 / Accepted 19 October 2000


We present a comprehensive study of the luminous young stellar object IRAS 12326-6245 at near- and mid-infrared wavelengths as well as in the millimetre wavelength range.

IRAS 12326-6245 is associated with two ultracompact H II regions. These massive young stellar objects are surrounded by a cluster of stars revealed by the near-infrared images. With N- and Q-band imaging, we find four very deeply embedded mid-infrared sources which form a remarkable proto-Trapezium system. Both ultracompact H II regions are associated with mid-infrared sources. In addition, a [FORMULA]-band nebulosity is present which outlines the rim of the molecular outflow.

The mapping in different molecular lines as well as in the [FORMULA] 1.3 mm continuum shows that IRAS 12326-6245 is deeply embedded in a dense molecular cloud core in agreement with the steeply rising infrared spectral energy distributions of the ultracompact H II regions. In the region one of the most energetic and massive bipolar molecular outflows was detected in CO(2-1), C18O(2-1), and SO with its origin close to IRAS 12326-6245.

Key words: stars: formation – ISM: clouds – ISM: individual objects: IRAS 12326-6245 – ISM: molecules – radio lines: ISM

* Based on observations collected at the European Southern Observatory, La Silla, Chile

Send offprint requests to: Th. Henning

Correspondence to: henning@astro.uni-jena.de

© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001