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Astron. Astrophys. 320, L17-L20 (1997)

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Letter to the Editor

Millimeter interferometry towards the ultra-compact HII region W3(OH)

F. Wyrowski 1, P. Hofner 2, P. Schilke 1, C.M. Walmsley 1, 3, D.J. Wilner 4 and J.E. Wink 5

1 I. Physikalisches Institut, Univ. zu Köln, Zülpicherstr. 77, D-50937 Köln. Germany
2 Cornell University, NAIC, Arecibo Observatory, P.O. Box 995, Arecibo, P.R. 00613
3 Osservatorio Astrofisico di Arcetri, Largo E.Fermi 5, I-50125 Firenze, Italy
4 Harvard Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
5 Insitut de Radioastronomie Millimétrique, Domaine Universitaire, F-38406 St-Martin-d'Hères, France

Received 10 January 1997 / Accepted 6 February 1997


We used the IRAM Interferometer to map the J=1-0 and J=2-1 lines of C17O as well as the continuum at 112 and 225 GHz of the W3(OH) region. Towards the cluster of water masers W3(H2O) we observed compact continuum emission at both frequencies with spectral index of 3.6 from hot dust emission. The C17O maps show more extended gas with the most massive molecular clump towards W3(H2O) and none towards W3(OH) itself. We derive a peak column density of [FORMULA]  cm-2 at the H2O maser position. Dust and line fluxes are both consistent with a mass of 10  [FORMULA]. Peaks of molecular line channel maps of C17O, CH3OH, and C2H5CN show an E-W orientation similar to the cluster of H2O masers.

Key words: ISM: individual objects: W3(OH) – ISM: clouds – ISM: molecules – radio lines: ISM – Radio continuum: ISM – Techniques: interferometric

Send offprint requests to: F.Wyrowski

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998