SLIDE 1
AGN spectra & lags Is the lag varying?
Outline
1
AGN spectra & lags
2
Is the lag varying? lag vs energy lag vs flux
Abdu Zoghbi Reverberation Lag Variability
Reverberation Lag Variability Abdu Zoghbi IoA, Cambridge - - PowerPoint PPT Presentation
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
SLIDE 2
SLIDE 3
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
SLIDE 4
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
SLIDE 5
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.
1 10 0.5 2 5 0.5 1 1.5 2 2.5 ratio Energy (keV)
Fabian et al. (09), Zoghbi et al. (10)
Abdu Zoghbi Reverberation Lag Variability
SLIDE 6
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!
1 10 0.5 2 5 0.5 1 1.5 2 2.5 ratio Energy (keV)
Fabian et al. (09), Zoghbi et al. (10)
Abdu Zoghbi Reverberation Lag Variability
SLIDE 7
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
SLIDE 8
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
What it is telling us?
Does it vary? with energy ... with flux ...?
1 10 0.5 2 5 0.5 1 1.5 2 2.5 ratio Energy (keV)
Abdu Zoghbi Reverberation Lag Variability
SLIDE 9
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
Energy Dependence of the lag
Lag (s) −100 −50 50 100 Energy (keV) 1 10 Lag (s) −100 100 200 300 400 Energy (keV) 1 10
Abdu Zoghbi Reverberation Lag Variability
SLIDE 10
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
Energy Dependence of the lag
Inner reflection Outer reflection
Lag (s) −100 −50 50 100 Energy (keV) 1 10
1 10 0.5 2 5 10−4 10−3 keV2 (Photons cm−2 s−1 keV−1) Energy (keV)
Abdu Zoghbi Reverberation Lag Variability
SLIDE 11
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
What it is telling us?
vs flux ...
O4 O3 O2 O1
Count rate (cts/s) 2.5 5 7.5 10 12.5 Time (ks) 100 200 300 400 500 600
Abdu Zoghbi Reverberation Lag Variability
SLIDE 12
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
Flux Dependence of the lag
Lag (s) −125 −100 −75 −50 −25 Flux (counts s-1) 1 2 3 4 5 Lag (s) −100 −50 50 100 150 200 250 Flux (counts s-1) 1 2 3 4 5
Abdu Zoghbi Reverberation Lag Variability
SLIDE 13
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
Flux Dependence of the lag
Lag (s) −125 −100 −75 −50 −25 Flux (counts s-1) 1 2 3 4 5
Abdu Zoghbi Reverberation Lag Variability
SLIDE 14
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
Flux Dependence of the lag
The link to spectral variability ...
Energy (keV) Kev2(Phot. cm-2 s-1 keV-1)
total powerlaw reflection blackbody
High flux 10−4 10−3 0.01 1 10 Low flux 1 10
Abdu Zoghbi Reverberation Lag Variability
SLIDE 15
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
Flux Dependence of the lag
Lag (s) −125 −100 −75 −50 −25 Flux (counts s-1) 1 2 3 4 5
Abdu Zoghbi Reverberation Lag Variability
SLIDE 16
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
Flux vs lag with light bending?
Energy (keV) Kev2(Phot. cm-2 s-1 keV-1)
total powerlaw reflection blackbody
High flux 10−4 10−3 0.01 1 10 Low flux 1 10
Abdu Zoghbi Reverberation Lag Variability
SLIDE 17
AGN spectra & lags Is the lag varying? lag vs energy lag vs flux
Flux vs lag with light bending?
Lag (GM/c3) 5 10 15 20 25 30 Height (GM/c2) 1 10
8.6 8.8 9 9.2 9.4 1 1.5 2 2.5 3 Abdu Zoghbi Reverberation Lag Variability
SLIDE 18
AGN spectra & lags Is the lag varying? lag vs energy 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