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We present sensitive high angular resolution ($\sim$ 1$"$) millimetercontinuum and line observations from the massive star forming region DR21(OH)located in the Cygnus X molecular cloud. Within the well-known dusty MM1-2molecular cores, we report the detection of a new cluster of about ten compactcontinuum millimeter sources with masses between 5 and 24 M$_\odot$, and sizesof a few thousands of astronomical units. These objects are likely to be largedusty envelopes surrounding massive protostars, some of them most probablydriving several of the outflows that emanate from this region. Additionally, wereport the detection of strong millimeter emission of formaldehyde (H$_2$CO)and methanol (CH$_3$OH) near 218 GHz as well as compact emission from thetypical outflow tracers carbon monoxide and silicon monoxide (CO and SiO)toward this massive star-forming region. The H$_2$CO and CH$_3$OH emission isluminous ($\sim$ 10$^{-4}$ L$_{\odot}$), well resolved, and found along thecollimated methanol maser outflow first identified at centimeter wavelengthsand in the sources SMA6 and SMA7. Our observations suggest that this maseroutflow might be energized by a millimeter source called SMA4 located in theMM2 dusty core. The CO and SiO emission traces some other collimated outflowsthat emanate from MM1-2 cores, and are not related with the low velocity maseroutflow.

Millimeter multiplicity in DR21(OH): outflows, molecular cores and envelopes