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Recent studies suggest that infrared dark clouds (IRDCs) have the potentialof harboring the earliest stages of massive star formation and indeed evidencefor this is found toward distinct regions within them. We present a study withthe Plateau de Bure Interferometer of a core in the archetypal filamentary IRDCG11.11-0.12 at few arcsecond resolution to determine its physical and chemicalstructure. The data consist of continuum and line observations covering theC34S 2-1 line and the methanol 2_k-1_k v_t=0 lines at 3mm and the methanol5_k-4_k v_t =0 lines at 1mm. Our observations show extended emission in thecontinuum at 1 and 3 mm. The methanol 2_k-1_k v_t=0 emission presents threemaxima extending over 1 pc scale (when merged with single-dish short-spacingobservations); one of the maxima is spatially coincident with the continuumemission. The fitting results show enhanced methanol fractional abundance(~3x10^-8) at the central peak with respect to the other two peaks, where itdecreases by about an order of magnitude (~4-6x10^-9). Evidence of extended 4.5microns emission, "wings" in the CH3OH 2_k-1_k spectra, and CH3OH abundanceenhancement point to the presence of an outflow in the East-West direction. Inaddition, we find a gradient of ~4 km/s in the same direction, which weinterpret as being produced by an outflow(s)-cloud interaction.

High-angular resolution observations of methanol in the infrared dark cloud core G11.11-0.12P1