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We conducted the first long-term (75 days) X-ray monitoring of the black holelow mass X-ray binary V404 Cyg, with the goal of understanding andcharacterizing its variability during quiescence. The X-ray light curve of V404shows several flares on timescales of hours with a count rate change of afactor of about 5-8. The root mean square variability is Fvar = 57.0(3.2)percent. The first order structure function is consistent with both a powerspectrum of index -1 (flicker noise), or with a power spectrum of index 0(white noise), implying that the light curve is variable on timescales fromdays to months. The X-ray spectrum is well fitted by a power law with spectralindex {\Gamma} = 2.10 - 2.35, and we found that the spectral shape remainsroughly constant as the flux changes. A constant spectral shape with respect toa change in the X-ray flux may favour a scenario in which the X-ray emission isdominated by synchrotron radiation produced in a jet.

Characterizing the quiescent X-ray variability of the black hole low mass x-ray binary V404 Cyg