NuSTAR + XMM Observations of NGC 1365: A Constant Inner Disc

NuSTAR + XMM Observations
of NGC 1365:
A Constant Inner Disc
Dom Walton
Caltech
G. Risaliti, F. Harrison, E. Kara, M. Parker, E. Rivers,
on behalf of the NuSTAR active galaxy working groups
XRU 2014
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Black Hole Spin
Supernova & gamma-ray bursts
(stellar black hole binaries)
Relativistic jets (both stellar black
hole binaries and active galaxies)
Galaxy evolution and supermassive
black hole formation (active galaxies)
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XRU 2014
D. Walton
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Measuring Black Hole Spin
a* = 0
a* = 1
NASA/CXC/M.Weiss
The radius of the innermost stable circular orbit
depends on the spin (Bardeen et al. 1972).
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D. Walton
νfν
Relativistic Disk Reflection
νfν
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ν
ν
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D. Walton
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Relativistic Disk Reflection
Characterising the disc reflection
component is one way in which we
can measure black hole spin for
both binaries and active galaxies
NuSTAR
Fabian et al. (2000)
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D. Walton
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NuSTAR Spin Program
NuSTAR is performing observations of both Galactic black hole binaries
and active galaxies with the purpose of constraining their spin,
including (among others):
Active galaxies:
Galactic binaries:
Source Coordina-on NGC 1365 XMM (x4) Source Coordina-on MCG-‐6-‐30-‐15 XMM Cygnus X-‐1 Suzaku Mrk 335 Suzaku GRS 1915+105 -‐ Swi> J2127 XMM 4U 1630-‐47 -‐ NGC 4151 Suzaku 4U 1957+11 XMM 3C 120 XMM IC 10 X-‐1* Chandra Fairall 9 XMM (see also talk by G. Matt tomorrow)
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*Thermal continuum method to be utilized
D. Walton
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Black Hole Spin: Recap
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D. Walton
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Complex Absorption
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D. Walton
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NGC 1365
NGC 1365
Risaliti et al. (2013, Nat)
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D. Walton
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NGC 1365
NGC 1365
Risaliti et al. (2013, Nat)
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D. Walton
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NGC 1365: NuSTAR+XMM
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XMM NuSTAR
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Walton et al. (2014)
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Characteristic signatures of disc reflection present
regardless of the level of line-of-sight absorption (see
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3 strengths
?)
poster
F28(Listby
E. Rivers
focusing on absorption variability)
XRU 2014
D. Walton
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NGC 1365: Variability
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Walton et al. (2014)
Displays both long and short timescale variability,
intrinsic,
Themesome
Message (List
3 strengths ?) some due to variable absorption
XRU 2014
D. Walton
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NGC 1365: NuSTAR+XMM
•  Extracted spectra from 16
time intervals
83!
•  Modelled data above and
below 10 keV separately
•  Above 10 keV: powerlaw
(same as below 10 keV) and
a reflected continuum
(pexrav)
•  Good correlation between
EW of the broad line and R
!
•  Below 10 keV: absorbed
powerlaw and broad iron
emission line
8
73!
7
63!
Walton et al. (2014)
638
639
63*
63!
63+
63,
63-
63.
"#"#$%&5 '()(
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XRU 2014
D. Walton
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NGC 1365: NuSTAR+XMM
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XRU 2014
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Walton et al. (2014)
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The black hole spin and the disc inclination obtained
are consistent for all four observations, even allowing
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for variable, partially covering absorption
D. Walton
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NGC 1365: X-ray Reverberation
Kara et al. (2014, sub.)
Clear reverberation (time delay) from the broad Fe K line, and
marginal detection from the Compton hump, implies a compact
(R <~ 10 RG) emission region (Uttley, Kara, Zoghbi talks tomorrow)
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XRU 2014
D. Walton
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Conclusions
•  Our 4 coordinated NuSTAR + XMM observations of NGC
1365 reveal an extreme level of absorption variability, yet
show the same characteristic signatures of reflection from
the inner accretion disc
•  Broad Fe K line and the Compton hump are correlated, each
observation independently returns the same BH spin and
disc inclination, and X-ray reverberation now detected
•  These results confirm NGC 1365 hosts a rapidly rotating BH
•  The combination of NuSTAR and XMM allows us to resolve
long-standing degeneracies regarding the interpretation of
the spectral features observed from AGN
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XRU 2014
D. Walton
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NGC 1365: NuSTAR+XMM
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Correlation between EWbroad and R is not simply due to parameter
degeneracies associated with the simple models used
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XRU 2014
D. Walton

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