Multi-timescale reverberation mapping of Mrk 335

Abstract

Time lags due to X-ray reverberation have been detected in several Seyfert galaxies. The different travel time between reflected and directly observed rays naturally causes this type of lag, which depends directly on the light-crossing timescale of the system and hence scales with the mass of the central black hole. Featureless `hard lags' not associated with reverberation, and often interpreted as propagating mass accretion rate fluctuations, dominate the longer timescale variability. Here we fit our reltrans model simultaneously to the time-averaged energy spectrum and the lag-energy spectra of the Seyfert galaxy Mrk 335 over two timescales (Fourier frequency ranges). We model the hard lags as fluctuations in the slope and strength of the illuminating spectrum, and self-consistently account for the effects that these fluctuations have on the reverberation lags. The resulting mass estimate is $1.1_{-0.7}^{+2.0}\times 10^6{M}_{\odot }$, which is significantly lower than the mass measured with the optical reverberation mapping technique (14 - 26 million $M_{\odot }$). When we add the correlated variability amplitudes to the time lags by fitting the full complex cross-spectra, the model is unable to describe the characteristic reverberation Fe K$\alpha$ line and cannot constrain the black hole mass. This may be due to the assumption that the direct radiation is emitted by a point-like source.

Accepted for publication in MNRAS

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Cited by in corpus (11)

• Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-Timing Analysis
• The NICER "Reverberation Machine": A Systematic Study of Time Lags in Black Hole X-Ray Binaries
• UV/Optical disk reverberation lags despite a faint X-ray corona in the AGN Mrk 335
• Modelling correlated variability in accreting black holes: the effect of high density and variable ionisation on reverberation lags
• A physical model for the UV/optical power spectra of AGN
• Changing Accretion Geometry of Seyfert 1 Mrk 335 with {\it NuSTAR}: A Comparative Study
• The evolution of the UV/optical lag spectrum of NGC 7469 seen by the Liverpool Telescope
• Machine learning application to detect light echoes around black holes
• Effects of ultra-fast outflows on X-ray time lags in AGN
• Modelling the energy dependent X-ray variability of Mrk 335
• Accretion Geometry of Black Hole X-ray Binaries: Insights from X-ray Observations