the nustar view of radio-quiet agn - avcr.czastro.cas.cz/svoboda/marinucci_fero8.pdf · the nustar...
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The NuSTAR view of radio-quiet AGN
Andrea Marinucci
8th FERO MeetingVninice HnaniceSept. 14, 2016
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Outline
• Brief introduction
• Results
• Conclusions
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Outline
• Brief introduction
Results
Conclusions and ideas for discussion
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Introduction
For the first time in X-ray astronomy, NuSTAR is providing us with high SNR spectra at energies above 10 keV, a crucial energy band for a sound
characterization of the underlying physical continuum, and, therefore, for a tight estimate of the spin of the central BH and high-energy cutoff energy.
Many of the objects studied so far have a simultaneous coverage with XMM-Newton/Suzaku and NuSTAR, providing the best data sets so far for
this kind of analysis.
3/13
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Introduction – Black hole spin measurements
Mrk 335 – NASA/JPL 2014 Press release
4/13
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Introduction – Coronal parameters
kT = 50 keVkT = 100 keVkT = 150 keV
5/13
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Introduction – Coronal parameters
kT = 50 keVkT = 100 keVkT = 150 keV
Molina+2013
5/13
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Outline
Brief introduction
• Results
Conclusions and ideas for discussion
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Results – Black hole spin measurements
6/13
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NGC 1365
Residuals to a G=1.75 power law continuum
Walton+2014
7/13
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NGC 1365
Residuals to a G=1.75 power law continuum
Both parameters indicate a quantity which is relative to
the primary continuum
Walton+2014
7/13
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MCG-6-30-16
Marinucci+2014
8/13
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MCG-6-30-16
Marinucci+2014
8/13
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Results – Coronal parameters
Fabian+2015
9/13
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Results – Coronal parameters
Fabian+2015
9/13
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Results – Coronal parametersIn some bright sources, high values or lower limits to the cutoff energy
have been found, suggesting the presence of a very hot corona surrounding the accretion disc.
NGC 5506 NGC 2110 NGC 7213
Matt+15 Marinucci+15 Ursini+15
medd
=0.7-14% medd
=0.2-3.7% medd~0.1%
10/13
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Results – Coronal parametersIn some bright sources, high values or lower limits to the cutoff energy
have been found, suggesting the presence of a very hot corona surrounding the accretion disc.
NGC 5506 NGC 2110 NGC 7213
Matt+15 Marinucci+15 Ursini+15
medd
=0.7-14% medd
=0.2-3.7% medd~0.1%
The next step is to build a small catalog and to start looking for correlations between the coronal temperature and other physical properties (e.g. black
hole mass, accretion rate).
10/13
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Results – Coronal parameters
Fabian+15Tortosa et al., in prep.
NuSTAR
INTEGRAL
Swift-BAT
ALL
11/13
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Results – Coronal parameters
.../NU
MCG+8-11-11 ? ? Swift/NU NGC 6814 ? ? Swit/NU
More observations are under scrutiny ..
12/13
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Outline
Brief introduction
Results
• Conclusions
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Conclusions
• A number of robust black hole spin measurements have been presented since the launch of NuSTAR
• Following the continuum helps in keeping track of the broad Iron Ka component
•High energy cut-off have been measured in several AGN with NuSTAR (more are yet to come!)
• They are not ubiquitous
• Further observations will help us in understanding the nature of the primary continuum, such as the relation between the
accretion rate and the cutoff energy and the link between the disc reflection and the extension of the hot corona.
13/13