2000A&A...361L..37R

We found a strong QPO feature at 0.085±0.002Hz in the power spectrum of an X-ray transient XTE J1118+480. The QPO was detected in PCA/RXTE data with an amplitude close to 10% rms, and width 0.034±0.006Hz. The shape of the power spectrum is typical for black hole candidates: almost flat at frequencies lower than 0.03Hz, roughly a power law with slope ∼1.2 from 0.03 to 1Hz, with steepening to ∼1.6 at higher frequencies. The hard energy spectrum detected up to ∼150keV and the absence of significant X-ray variability at the high frequencies above 100Hz strongly support the identification of XTE J1118+480 as black hole transient.