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In June 2015, the black hole X-ray binary (BHXRB) V404 Cygni went intooutburst for the first time since 1989. Here, we present a comprehensive searchfor quasi-periodic oscillations (QPOs) of V404 Cygni during its recentoutburst, utilizing data from six instruments on board five different X-raymissions: Swift/XRT, Fermi/GBM, Chandra/ACIS, INTEGRAL's IBIS/ISGRI and JEM-X,and NuSTAR. We report the detection of a QPO at 18 mHz simultaneously with bothFermi/GBM and Swift/XRT, another example of a rare but slowly growing new classof mHz-QPOs in BHXRBs linked to sources with a high orbital inclination.Additionally, we find a duo of QPOs in a Chandra/ACIS observation at 73 mHz and1.03 Hz, as well as a QPO at 136 mHz in a single Swift/XRT observation that canbe interpreted as standard Type-C QPOs. Aside from the detected QPOs, there issignificant structure in the broadband power, with a strong feature observablein the Chandra observations between 0.1 and 1 Hz. We discuss our results in thecontext of current models for QPO formation.

Detection of Very Low-Frequency Quasi-Periodic Oscillations in the 2015 Outburst of V404 Cygni