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We study the influence of a high baryonic streaming velocity on the formationof direct collapse black holes (DCBHs) with the help of cosmologicalsimulations carried out using the moving mesh code {\sc arepo}. We show that astreaming velocity that is as large as three times the root-mean-squared valueis effective at suppressing the formation of H$_{2}$-cooled minihaloes, whilestill allowing larger atomic cooling haloes (ACHs) to form. We find that enoughH$_{2}$ forms in the centre of these ACHs to effectively cool the gas,demonstrating that a high streaming velocity by itself cannot produce theconditions required for DCBH formation. However, we argue that high streamingvelocity regions do provide an ideal environment for the formation of DCBHs inclose pairs of ACHs (the "synchronised halo" model). Due to the absence of starformation in minihaloes, the gas remains chemically pristine until the ACHsform. If two such haloes form with only a small separation in time and space,then the one forming stars earlier can provide enough ultraviolet radiation tosuppress H$_{2}$ cooling in the other, allowing it to collapse to form a DCBH.Baryonic streaming may therefore play a crucial role in the formation of theseeds of the highest redshift quasars.

The formation of direct collapse black holes under the influence of streaming velocities