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Quasi-periodic signals have yielded important constraints on the masses ofblack holes in galactic X-ray binaries, and here we extend this to activegalactic nuclei (AGNs). We employ a wavelet technique to analyze 19observations of 10 AGNs obtained with the XMM-Newton EPIC pn camera. We reportthe detection of a candidate 3.3 ks quasi period in 3C 273. If this periodrepresents an orbital timescale originating near a last stable orbit of 3Rs, itimplies a central black hole mass of 7.3x10^6 Msun. For a maximally rotatingblack hole with a last stable orbit of 0.6Rs, a central black hole mass of8.1x10^7 Msun is implied. Both of these estimates are substantially lower thanprevious reverberation-mapping results, which place the central black hole massof 3C 273 at about 2.35 x10^8 Msun. Assuming that this reverberation mass iscorrect, the X-ray quasi period would be caused by a higher order oscillatorymode of the accretion disk.

Wavelet Analysis of AGN X-Ray Time Series: A QPO in 3C 273?