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

F. Wyrowski tex2html_wrap_inline1451 , P. Hofner tex2html_wrap_inline1453 , P. Schilke tex2html_wrap_inline1451 , C.M. Walmsley tex2html_wrap_inline1695 , D.J. Wilner tex2html_wrap_inline1457 , J.E. Wink tex2html_wrap_inline1505
tex2html_wrap_inline1451 I. Physikalisches Institut, Univ. zu Köln, Zülpicherstr. 77, D-50937 Köln. Germany
tex2html_wrap_inline1453 Cornell University, NAIC, Arecibo Observatory, P.O. Box 995, Arecibo, P.R. 00613
tex2html_wrap_inline1455 Osservatorio Astrofisico di Arcetri, Largo E.Fermi 5, I-50125 Firenze, Italy
tex2html_wrap_inline1457 Harvard Smithsonian Center for Astrophysics , 60 Garden St., Cambridge, MA 02138, USA
tex2html_wrap_inline1505 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 tex2html_wrap_inline1711 as well as the continuum at 112 and 225 GHz of the W3(OH) region. Towards the cluster of water masers W3( tex2html_wrap_inline1713 ) we observed compact continuum emission at both frequencies with spectral index of 3.6 from hot dust emission. The tex2html_wrap_inline1711 maps show more extended gas with the most massive molecular clump towards W3( tex2html_wrap_inline1713 ) and none towards W3(OH) itself. We derive a peak column density of tex2html_wrap_inline1719   tex2html_wrap_inline1721 at the tex2html_wrap_inline1713 maser position. Dust and line fluxes are both consistent with a mass of 10  tex2html_wrap_inline1725 . Peaks of molecular line channel maps of tex2html_wrap_inline1711 , tex2html_wrap_inline1729 , and tex2html_wrap_inline1731 show an E-W orientation similar to the cluster of tex2html_wrap_inline1713 masers.