The predominance of infrared emission from the polar region of accreting supermassive black holes
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7/25/2019 The predominance of infrared emission from the polar region of accreting supermassive black holes
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The predominance of infrared emission from
the polar region of accreting supermassive
black holes
Daniel AsmusESO, Chile
with
Sebastian Hnig & Poshak Gandhi
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AGN are bright(est) in the mid-infrared.
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Type 2AGN
Type 1
AGN
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Type 2AGN
Type 1
AGN
???
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WISE (0.4m)
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WISE (0.4m)
4
VLT/VISIR (8.2m)
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Asmus et al. 2014
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Only few without strong star formation are resolved (~10-100pc)Is the resolved emission coming from the torus?
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Establishing a system axis from ionisation cones [OIII],radio jets, maser disks, and polarized emission.
NGC 2110;credit: D. Evans
Circinus;Greenhill et al. 2003
Circinus;
Wilson et. al. 2000
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The resolved emission is coming from the polar axis of theAGN systems!
Asmus et al. 2016 (see also Braatz et al. 1993; Cameron et al. 1993; Bock et al. 2000;
Radomski et al. 2002, 2003; Whysong & Antonucci 2004; Packham et al. 2005;
Reunanen, Prieto & Siebenmorgen 2010; Hnig et al. 2010)
Angular difference (System Axis - MIR extension)
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Is the mid-infrared emission of AGN dominated by dustin/along the ionisation cone instead of the obscuring torus?
Relative amount of resolved emission
Asmus et al. 2016
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The resolved emission strongly correlates with the [OIV]emission produced in the ionisation cone
Relativeamountofre
solvedemission
[OIV] emissionAsmus et al. 2016
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Circinus;
T
ristrame
tal.201
4
NGC1068;
Lp
ezGonzagaetal.2
014
N
GC3783;Hnige
tal.2013
N
GC424;Hnige
tal.2012
Polar elongation is dominant also on parsec scaleas found with MIDI interferometry (Lopez-Gonzaga et al. 2016)
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The small and large scale elongation are aligned and seem totrace the edge of the ionisation cone.
Circinus; Tristram+14
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A new paradigm for the AGN dust structure?
Hnig et al. 2012
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39 40 41 42 43 44 45 46log Lint(2-10keV) [erg/s]
39
40
41
42
43
44
45
46
logLnuc(12m
)[erg/s]
The mid-infraredX-ray correlation for all types of AGN is drivenby dust in the ionisation cones rather than the torus
Absorption-corr. X-ray luminosity
ObservedMIR
luminosity
Asmus et al. 2015
(see also:Glass et al. 1982;
Krabbe et al. 2001;Lutz et al. 2004;Horst et al. 2006;Ramos Almeida et al. 2007;Horst et al. 2008;Gandhi et al. 2009;Levenson et al. 2009;Fiore et al. 2009;Hardcastle et al. 2009;Hoenig et al. 2010;Asmus et al. 2011;Mullaney et al. 2011;Mason et al. 2012;
Matsuta et al. 2012;Ichikawa et al. 2012;Sazonov et al. 2012;
Mateos et al. 2015;Stern 2015)
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What have we learned?
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Back-up Slides
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The chop & nod technique makes the target observable.
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The resolved emission is not correlated to the host orientation.
Asmus et al. 2016
Angular difference (System Axis - MIR extension)
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The outliers
Seyfert 1.2
[OIII] pointlike
marginally
resolved
PA error 27
Seyfert 1.5/2
wide opening
ionisation cones
edge-on spiral
emission traces
host dust lane
Seyfert 1.2
wide opening
ionisation cones
weakest AGN in
the sample
low S/N
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The reasons for the low detection rates
Distance unresolved
low S/N intrinsic weakness
Inclination no elongation
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Difference between type I and II is smaller than expected
39 40 41 42 43 44 45 46log Lint(2-10keV) [erg/s]
39
40
41
42
43
44
45
46
logLnuc(12m
)[erg/s]
Sy 1-1.5 (>=3 epochs)
Sy 1.8-1.9 (>=3 epochs)
Sy 2 (>=3 epochs)
LINER (>=3 epochs)
Sy 1-1.5 (