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We report new, $\sim$1000 AU spatial resolution observations of 225 GHz dustcontinuum emission towards the OB cluster-forming molecular clump G33.92+0.11.On parsec scales, this molecular clump presents a morphology with severalarm-like dense gas structures surrounding the two central massive ($\gtrsim$100$M_{\odot}$) cores. From the new, higher resolution observations, we identified28 localized, spatially compact dust continuum emission sources, which may becandidates of young stellar objects. Only one of them is not embedded withinknown arm-like (or elongated) dense gas structures. The spatial separations ofthese compact sources can be very well explained by Jeans lengths. We foundthat G33.92+0.11 may be consistently described by a marginally centrifugallysupported, Toomre unstable accretion flow which is approximately in a face-onprojection. The arm-like overdensities are natural consequence of the Toomreinstability, which can fragment to form young stellar objects in shorter timescales than the timescale of the global clump contraction. On our resolvedspatial scales, there is not yet evidence that the fragmentation is halted byturbulence, magnetic field, or stellar feedback.

Investigating fragmentation of gas structures in OB cluster-forming molecular clump G33.92+0.11 with 1000 AU resolution observations of ALMA