J/ApJ/822/109 MIR view of polar dust emission in local AGNs (Asmus+, 2016)
The subarcsecond mid-infrared view of local active galactic nuclei.
III. Polar dust emission.
Asmus D., Honig S.F., Gandhi P.
<Astrophys. J., 822, 109-109 (2016)>
=2016ApJ...822..109A 2016ApJ...822..109A (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, Seyfert ; Infrared sources ;
Morphology
Keywords: accretion, accretion disks - galaxies: active - galaxies: nuclei -
infrared: galaxies - X-rays: galaxies
Abstract:
Recent mid-infrared (MIR) interferometric observations have shown that
in a few active galactic nuclei (AGNs) the bulk of the infrared
emission originates from the polar region above the putative torus,
where only a little dust should be present. Here, we investigate
whether such strong polar dust emission is common in AGNs. Out of 149
Seyferts in the MIR atlas of local AGNs, 21 show extended MIR emission
on single-dish images. In 18 objects, the extended MIR emission aligns
with the position angle (PA) of the system axis, established by [O III],
radio, polarization, and maser-based PA measurements. The relative
amount of resolved MIR emission is at least 40% and scales with the
[O IV] fluxes, implying a strong connection between the extended
continuum and [O IV] emitters. These results together with the
radio-quiet nature of the Seyferts support the scenario that the bulk
of MIR emission is emitted by dust in the polar region and not by the
torus, which would demand a new paradigm for the infrared emission
structure in AGNs. The current low detection rate of polar dust in the
AGNs of the MIR atlas is explained by the lack of sufficient
high-quality MIR data and the requirements on the orientation,
strength of narrow-line region, and distance of the AGNs. The James
Webb Space Telescope will enable much deeper nuclear MIR studies with
comparable angular resolution, allowing us to resolve the polar
emission and surroundings in most of the nearby AGNs.
Description:
The parent sample for this work is the AGN MIR atlas of 253 objects
(Asmus et al. 2014, J/MNRAS/439/1648). The optical classifications and
distances (using the same cosmology) are adopted from that work.
We furthermore use the nuclear MIR flux measurements from Asmus et al.
(2014, J/MNRAS/439/1648). These are extracted from ground-based
multi-filter photometry obtained with the instruments VLT/VISIR
(Lagage et al. 2004Msngr.117...12L 2004Msngr.117...12L), Gemini/T-ReCS (Telesco et al.
1998SPIE.3354..534T 1998SPIE.3354..534T), Gemini/Michelle (Glasse et al. 1997SPIE.2871.1197G 1997SPIE.2871.1197G),
and Subaru/COMICS (Kataza et al. 2000SPIE.4008.1144K 2000SPIE.4008.1144K), with an angular
resolution of the order of 0.35" or 120 pc for the median sample
distance of 72 Mpc at 12 µm.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 138 149 Properties of the Seyfert Sample
refs.dat 85 133 References
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See also:
J/ApJS/133/77 : VLA radio continuum survey of Seyfert galaxies (Ho+, 2001)
J/ApJ/705/14 : Seyfert galaxies in the mid-IR (Deo+, 2009)
J/ApJ/725/2270 : Mid-IR emission lines in AGNs (Pereira-Santaella+, 2010)
J/ApJS/208/24 : Spitzer MIR AGN survey. I. (Lacy+, 2013)
J/MNRAS/439/1648 : Subarcsecond mid-infrared atlas of local AGN (Asmus+, 2014)
J/MNRAS/454/766 : Mid-infrared-X-ray correlation for local AGNs (Asmus+, 2015)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Seyfert galaxy name
25- 29 F5.1 Mpc Dist [3.8/807] Distance
31- 37 A7 --- Class Optical Seyfert classification (1)
39 A1 --- Ext [npuy] Nuclear MIR extension from
Asmus et al. (2014, J/MNRAS/439/1648) (2)
41- 44 F4.2 --- Ratio [0.01/2.59]? Ratio of relative extended to
nuclear emission at 12µm
(Rnucext=FνGau/FνPSF-1)
46- 48 I3 deg PA-MIR [1/210] Mean nuclear MIR position angle from
the individual images from Asmus et al.
(2014, J/MNRAS/439/1648) (3)
50- 51 I2 deg e_PA-MIR [3/89]? Uncertainty in PA-MIR (4)
53- 55 I3 deg PA-NLR [-17/215]? Position angle of the narrow-line
region (NLR) major axis, mostly from [O III]
images
57- 71 A15 --- r_PA-NLR Reference for PA-NLR (see refs.dat file)
73- 75 I3 deg PA-Rad [-20/245]? Position angle of the nuclear
radio morphology
77- 87 A11 --- r_PA-Rad Reference for PA-Rad (see refs.dat file)
89- 91 I3 deg PA-Pol [-45/150]? Position angle of polarized broad
lines
93- 95 I3 --- r_PA-Pol ? Reference for PA-Pol (see refs.dat file)
97- 99 I3 deg PA-Mas [-34/155]? Maser position angle
101-111 A11 --- r_PA-Mas Reference for PA-Mas (see refs.dat file)
113-115 I3 deg PA-SA [-41/245]? Mean system axis position angle
117-118 I2 deg e_PA-SA [1/53]? Uncertainty in PA-SA (if multiple
PAs are used) (4)
120-122 I3 deg PA-Host [-60/290]? Host inner structure position
angle
124-125 I2 --- r_PA-Host ? Reference for PA-Host (see refs.dat file)
127-128 A2 --- l_logF [≤ ] Limit flag on logF
129-134 F6.2 10-3W/m2 logF [-14.52/-10.72]? The [O IV] 25.89µm line
flux (in erg/s/cm2)
136-138 I3 --- r_logF ? Reference for logF (see refs.dat file)
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Note (1): Adopted from Asmus et al. 2014, J/MNRAS/439/1648.
Note (2): Extension as follows:
n = Not resolved;
p = Possibly extended;
u = Unknown extension;
y = Extended.
Note (3): Note that this value can be unreliable if the object was not
classified as extended.
Note (4): Standard deviation in the case of multiple measurements available.
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Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Ref [1/133] Reference code
5- 37 A33 --- Aut Author's name(s)
39- 57 A19 --- BibCode BibCode
59- 85 A27 --- Com Comment on reference
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History:
From electronic version of the journal
References:
Asmus et al. Paper I. 2014MNRAS.439.1648A 2014MNRAS.439.1648A Cat. J/MNRAS/439/1648
Asmus et al. Paper II. 2015MNRAS.454..766A 2015MNRAS.454..766A Cat. J/MNRAS/454/766
Asmus et al. Paper III. 2016ApJ...822..109A 2016ApJ...822..109A This catalog
Isbell et al. Paper IV. 2021ApJ...910..104I 2021ApJ...910..104I Cat. J/ApJ/910/104
(End) Tiphaine Pouvreau [CDS] 14-Feb-2018