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We report the most recent results of our analysis of X-ray monitoring of newGalactic Black Hole (BH) candidates XTE J1752-225 and MAXI J1659-152 performedby Rossi X-ray Timing Explorer (RXTE). We investigate various aspects of theRXTE data including energy and power spectra, variability energy distributionand phase lags between soft and hard energy bands. The sources generallyexhibit the spectral states and evolution expected from an accreting stellarmass BH. The energy distribution of different variability components show thatthe aperiodic noise has a spectrum consistently softer with respect to thetotal rms spectrum, while the spectrum of the quasi-periodic (QPO) features isharder. Particularly interesting behavior is observed in phase lags. Namely,XTE J1753-223 shows that QPO in the hard band lags the QPO in the soft band.This is opposite to what was previously reported in other bright BH candidatesand also found in our analysis from MAXI J1659-152. We report the results of BHmass estimations using the spectral-timing correlation scaling technique.Namely, we obtain the BH masses of 9.5 +/-1.5 and 20+/-3 solar masses for XTEJ1752-223 and MAXI J1659-152 correspondingly.

RXTE Observations of New Black Hole Candidates XTE J1752-223 and MAXI J1659-152