Now showing items 1-6 of 6
Observations and a model for the infrared continuum of Centaurus A
We present ISOSWS, ISOPHOT_S and 8-13 μm observations of Centaurus A which show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We find that, in a small ...
Polarization due to dichroic absorption and emission by aligned grains in dusty discs
We present a method for calculating the infrared polarization due to absorption and emission by aligned grains distributed in a disc or a torus. The temperature distribution in the torus is calculated with the axially ...
Polarimetry and modelling of narrow-line active galaxies
We present optical spectropolarimetry along with optical and infrared broad-band filter polarimetry of selected warm [f(25 μm)/f(60 μm) ≥ 0.3] IRAS galaxies and other known Seyfert 2 galaxies. Broad lines in polarized flux ...
Scattered broad optical lines in the polarized flux spectrum of the FR II galaxy 3C 321
We present optical/infrared broad-band filter polarimetry and optical spectropolarimetry of the powerful FR II galaxy 3C 321. The latter observations reveal a scattered broad component to the Hα emission line, detectable ...
The nuclear torus in the active galaxy NGC 1068
We present near-infrared polarized images of the active galaxy NGC 1068. At these wavelengths, the counter-cone is observed in scattered light. At H (1.64 μm) we detect an absorption band across the counter-cone, which we ...
Polarimetry and the torus
While the torus plays an obvious role in blocking direct light, and thus increasing the observed polarization from scattering, its role in directly producing polarized flux is less clear. Contributions to the infrared ...