NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T23:55:36 PDT
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For refcode 2008ApJ...679..182E:
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2008ApJ...679..182E Wavelet Analysis of AGN X-Ray Time Series: A QPO in 3C 273? Espaillat, C.; Bregman, J.; Hughes, P.; Lloyd-Davies, E. Abstract. Quasi-periodic signals have yielded important constraints on the masses of black holes in galactic X-ray binaries, and here we extend this to active galactic nuclei (AGNs). We employ a wavelet technique to analyze 19 observations of 10 AGNs obtained with the XMM-Newton EPIC pn camera. We report the detection of a candidate 3.3 ks quasi period in 3C 273. If this period represents an orbital timescale originating near a last stable orbit of 3R_s_, it implies a central black hole mass of 7.3x10^6^ M_sun_. For a maximally rotating black hole with a last stable orbit of 0.6R_s_, a central black hole mass of 8.1x10^7^ M_sun_ is implied. Both of these estimates are substantially lower than previous reverberation-mapping results, which place the central black hole mass of 3C 273 at about 2.35x10^8^ M_sun_. Assuming that this reverberation mass is correct, the X-ray quasi period would be caused by a higher order oscillatory mode of the accretion disk. Key words: Galaxies: Active, Galaxies: Individual: Alphanumeric: 3C 273, X-Rays: Galaxies
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