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We observe the 1.2 mm continuum emission around the OB cluster forming regionG10.6-0.4, using the IRAM 30m telescope MAMBO-2 bolometer array and theSubmillimeter array. Comparison of the Spitzer 24 $\mu$m and 8 $\mu$m imageswith our 1.2 mm continuum maps reveals the ionization front of an HII region,the photon-dominated layer, and several 5 pc scale filaments following theouter edge of the photon-dominated layer. The filaments, which are resolved inthe MAMBO-2 observations, show regularly spaced parsec-scale molecular clumps,embedded with a cluster of submillimeter molecular cores as shown in the SMA0.87 mm observations. Toward the center of the G10.6-0.4 region, the combinedSMA+IRAM 30m continuum image reveals several, parsec-scale protrusions. Theymay continue down to within 0.1 pc of the geometric center of a dense 3 pc sizestructure, where a 200 M$_{\odot}$ OB cluster resides. The observed filamentsmay facilitate mass accretion onto the central cluster--forming region in thepresence of strong radiative and mechanical stellar feedbacks. Theirfilamentary geometry may also facilitate fragmentation. We did not detect anysignificant polarized emission at 0.87 mm in the inner 1 pc region with theSMA.

The Origin of OB Clusters: From 10 pc to 0.1 pc