Bibcode
Schartmann, M.; Wada, K.; Prieto, M. A.; Burkert, A.; Tristram, K. R. W.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 445, Issue 4, p.3878-3891
Advertised on:
12
2014
Número de citas
52
Número de citas referidas
50
Descripción
The central engines of Seyfert galaxies are thought to be enshrouded by
geometrically thick gas and dust structures. In this paper, we derive
observable properties for a self-consistent model of such toroidal gas
and dust distributions, where the geometrical thickness is achieved and
maintained with the help of X-ray heating and radiation pressure due to
the central engine. Spectral energy distributions (SEDs) and images are
obtained with the help of dust continuum radiative transfer calculations
with RADMC-3D. For the first time, we are able to present time-resolved
SEDs and images for a physical model of the central obscurer. Temporal
changes are mostly visible at shorter wavelengths, close to the combined
peak of the dust opacity as well as the central source spectrum and are
caused by variations in the column densities of the generated outflow.
Because of the three-component morphology of the hydrodynamical models -
a thin disc with high-density filaments, a surrounding fluffy component
(the obscurer) and a low-density outflow along the rotation axis - we
find dramatic differences depending on wavelength: whereas the
mid-infrared images are dominated by the elongated appearance of the
outflow cone, the long wavelength emission is mainly given by the cold
and dense disc component. Overall, we find good agreement with observed
characteristics, especially for those models, which show clear outflow
cones in combination with a geometrically thick distribution of gas and
dust, as well as a geometrically thin, but high column density disc in
the equatorial plane.
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