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

F. Wyrowski , P. Hofner , P. Schilke , C.M. Walmsley , D.J. Wilner , J.E. Wink
I. Physikalisches Institut, Univ. zu Köln, Zülpicherstr. 77, D-50937 Köln. Germany
Cornell University, NAIC, Arecibo Observatory, P.O. Box 995, Arecibo, P.R. 00613
Osservatorio Astrofisico di Arcetri, Largo E.Fermi 5, I-50125 Firenze, Italy
Harvard Smithsonian Center for Astrophysics , 60 Garden St., Cambridge, MA 02138, USA
Institut de Radioastronomie Millimétrique, Domaine Universitaire, F-38406 St-Martin-d'Hères, France
Abstract: We used the IRAM Interferometer to map the J=1-0 and J=2-1 lines of as well as the continuum at 112 and 225 GHz of the W3(OH) region. Towards the cluster of water masers W3( ) we observed compact continuum emission at both frequencies with spectral index of 3.6 from hot dust emission. The maps show more extended gas with the most massive molecular clump towards W3( ) and none towards W3(OH) itself. We derive a peak column density of   at the maser position. Dust and line fluxes are both consistent with a mass of 10  . Peaks of molecular line channel maps of , , and show an E-W orientation similar to the cluster of masers.