Tootfinder

Echo mapping of the black hole accretion flow in NGC 7469
Raj Prince, Juan V. Hern\'andez Santisteban, Keith Horne, J. Gelbord, Ian McHardy, R. Edelson, C. A. Onken, F. R. Donnan, M. Vestergaard, S. Kaspi, H. Winkler, E. M. Cackett, H. Landt, A. J. Barth, T. Treu, S. Valenti, P. Lira, D. Chelouche, E. Romero Colmenero, M. R. Goad, D. H. Gonzalez-Buitrago, E. Kara, C. Villforth

Echo mapping of the black hole accretion flow in NGC 7469
Reverberation mapping (RM) can measure black hole accretion disc sizes and radial structure through observed time lags that should increase with wavelength as $τ\proptoλ^{4/3}$. Our 250-day RM campaign on NGC 7469 combines sub-day cadence 7-band photometry from the Las Cumbres Observatory robotic telescopes and weekly X-ray and UVOT data from Swift. By fitting these light curves, we measure the spectral energy distribution of the variable accretion disc and inter-band lags of just 1.5 days ac…