Reverberation Lag Variability Abdu Zoghbi IoA, Cambridge - PowerPoint PPT Presentation

Reverberation Lag Variability Abdu Zoghbi IoA, Cambridge Southampton :: 21/05/2010 Andy Fabian, Phil Uttley

AGN spectra & lags Is the lag varying? Outline AGN spectra & lags 1 Is the lag varying? 2 lag vs energy lag vs flux Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags Is the lag varying? Broad Lines from the inner regions of BH Seen in many AGN. Tanaka et al. (95), Fabian et al. (02), Nandra et al. (07) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags Is the lag varying? Broad Lines from the inner regions of BH ... and also in Galactic black holes and neutron stars. Miller et al. (07,09), Cackett et al. (08,09), Reis et al. (09) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags Is the lag varying? A long XMM observation of 1H0707-495 A long XMM observation in 2008 enabled the identification of a broad iron L line. 2.5 2 ratio 1.5 1 0.5 0.5 1 2 5 10 Energy (keV) Fabian et al. (09), Zoghbi et al. (10) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags Is the lag varying? A long XMM observation of 1H0707-495 It confirms the reflection nature of emission. High signal at iron L energies enable us to do more than spectral fitting ... time lags! 2.5 2 ratio 1.5 1 0.5 0.5 1 2 5 10 Energy (keV) Fabian et al. (09), Zoghbi et al. (10) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags Is the lag varying? Reverberation A time delay of 30 seconds on time scales of few tens of minutes. Fabian et al. (09), Zoghbi et al. (10) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux What it is telling us? Does it vary? with energy ... with flux ...? 2.5 2 ratio 1.5 1 0.5 0.5 1 2 5 10 Energy (keV) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Energy Dependence of the lag 100 400 50 300 Lag (s) Lag (s) 200 0 100 −50 0 −100 −100 1 10 1 10 Energy (keV) Energy (keV) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Energy Dependence of the lag 100 Inner reflection Outer reflection 50 keV 2 (Photons cm −2 s −1 keV −1 ) Lag (s) 0 10 −3 −50 10 −4 −100 1 10 0.5 1 2 5 10 Energy (keV) Energy (keV) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux What it is telling us? vs flux ... 12.5 O1 O2 O3 O4 Count rate (cts/s) 10 7.5 5 2.5 0 0 100 200 300 400 500 600 Time (ks) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Flux Dependence of the lag 250 0 200 −25 150 Lag (s) Lag (s) −50 100 50 −75 0 −100 −50 −100 −125 0 1 2 3 4 5 0 1 2 3 4 5 Flux (counts s -1 ) Flux (counts s -1 ) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Flux Dependence of the lag 0 −25 Lag (s) −50 −75 −100 −125 0 1 2 3 4 5 Flux (counts s -1 ) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Flux Dependence of the lag The link to spectral variability ... 0.01 High flux Low flux Kev 2 (Phot. cm -2 s -1 keV -1 ) 10 −3 total 10 −4 powerlaw reflection blackbody 1 10 1 10 Energy (keV) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Flux Dependence of the lag 0 −25 Lag (s) −50 −75 −100 −125 0 1 2 3 4 5 Flux (counts s -1 ) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Flux vs lag with light bending? 0.01 High flux Low flux Kev 2 (Phot. cm -2 s -1 keV -1 ) 10 −3 total 10 −4 powerlaw reflection blackbody 1 10 1 10 Energy (keV) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Flux vs lag with light bending? 30 9.4 9.2 25 9 Lag (GM/c 3 ) 8.8 20 8.6 1 1.5 2 2.5 3 15 10 5 1 10 Height (GM/c 2 ) Abdu Zoghbi Reverberation Lag Variability

AGN spectra & lags lag vs energy Is the lag varying? lag vs flux Summary! Lag vs Energy makes sense, and rules out distant reflection. Lag vs Flux is potentially holding exciting information about the geometry around the black hole. Abdu Zoghbi Reverberation Lag Variability