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Astron. Astrophys. 325, 725-744 (1997)

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The disk-outflow system around the high-mass (proto)star IRAS 20126+4104

R. Cesaroni 1, M. Felli 1, L. Testi 2, C.M. Walmsley 1, 3 and L. Olmi 4

1 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
2 Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 5, I-50125 Firenze, Italy
3 I. Physikalisches Institut der Universität zu Köln, Zülpicherstrasse 77, D-50937 Köln, Germany
4 Cornell University, NAIC, Arecibo Observatory, P.O. Box 995, Arecibo, P.R. 00613

Received 19 November 1996 / Accepted 27 March 1997


We have used the Pico Veleta 30-m telescope and the Plateau de Bure interferometer to obtain maps of the molecular gas associated with IRAS 20126+4104 in 11 rotational transitions. We also present near infrared images of the same region taken with the TIRGO and NOT telescopes. A molecular clump centred on the H2 O masers associated with the IRAS source is found. A molecular bipolar outflow is clearly evidenced by the interferometer maps in the HCO [FORMULA] (1-0) line, originating at the center of the clump; also, the images in the K-band continuum and in the H2 [FORMULA] [FORMULA] vibrational line trace the same bipolar structure seen in HCO [FORMULA]. A flattened structure elongated in the direction perpendicular to the outflow axis is seen in the CH3 CN(5-4) line: we interpret this as a rotating disk with a very young massive early type star at its centre. We conclude that IRAS 20126+4104 represents a beautiful example of a disk-outflow system associated with an early type (proto)star, prior to the development of an ultracompact HII region.

Key words: ISM: clouds – ISM: individual objects: IRAS 20126+4104 – ISM: molecules – radio lines: ISM

Send offprint requests to: R. Cesaroni

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998