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
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 -band nebulosity is present which outlines the rim of the molecular outflow.
The mapping in different molecular lines as well as in the 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
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© European Southern Observatory (ESO) 2000
Online publication: January 29, 2001