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J/A+A/473/369 VISIR/VLT mid-infrared imaging of Seyfert nuclei (Haas+, 2007)
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Beginning of ReadMe :J/A+A/473/369 VISIR/VLT mid-infrared imaging of Seyfert nuclei (Haas+, 2007)
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VISIR/VLT mid-infrared imaging of Seyfert nuclei: nuclear dust emission and
the Seyfert-2 dichotomy.
Haas M., Siebenmorgen R., Pantin E., Horst H., Smette A., Kaufl H.-U.,
Lagage P.-O., Chini R.
<Astron. Astrophys. 473, 369 (2007)>
=2007A&A...473..369H
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ADC_Keywords: Galaxies, Seyfert ; Galaxies, IR
Keywords: galaxies: nuclei - galaxies: active - galaxies: Seyfert -
infrared: galaxies
Abstract:
Half of the Seyfert-2 galaxies escaped detection of broad lines in
their polarised spectra observed so far. Some authors have suspected
that these non-HBLRs contain real Sy2 nuclei without intrinsic broad
line region hidden behind a dust torus. If this were true, then their
nuclear structure would fundamentally differ from that of Sy2s with
polarised broad lines: in particular, they would not be explained by
orientation-based AGN unification. Further arguments for two
physically different Sy2 populations have been derived from the warm
and cool IRAS F25/F60 ratios. These ratios, however, refer to the
entire host galaxies and are unsuitable to conclusively establish the
absence of a nuclear dust torus. Instead, a study of the Seyfert-2
dichotomy should be performed on the basis of nuclear properties only.
Here we present the first comparison between [OIII] lambda 5007AA
and mid-infrared imaging at matching spatial resolution. The aim
is to check whether the nuclear dust emission scales with AGN
luminosity as traced by [OIII].
Description:
During the scientific verification phase of the VISIR instrument at
the ESO Very Large Telescope we observed 16 Sy1 and Sy2 nuclei at
11.25um with 0.35" spatial resolution (FWHM). We supplement
our observations with high-resolution 10-12um literature data of
58 Seyfert galaxies, for which spectroscopic or spectropolarimetric
information and far-infrared data are available.