Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.340..733r&link_type=abstract
Monthly Notice of the Royal Astronomical Society, Volume 340, Issue 3, pp. 733-738.
Astronomy and Astrophysics
Astronomy
3
Polarization, Scattering, Galaxies: Active, Galaxies: Individual: Ngc 4151, Galaxies: Seyfert
Scientific paper
We present subarcsec resolution imaging polarimetry of the Seyfert 1 galaxy NGC 4151 in the J (1.23 μm) and H (1.64 μm) bands. The polarized flux images show elongated emission in both near-infrared bands, mainly to the north-east along a position angle of 30°. Detailed modelling indicates that the observed polarization can be reproduced by scattering in a very broad bi-conical structure, and in the region of the disc of the host galaxy illuminated by the AGN. The forward scattering and illumination cone has a half-opening angle of 60° and is at an inclination of 40° to the line of sight. To produce the best fit to the observations, an optically thick torus is required to attenuate the view to the bulk of the counter-scattering cone in the north-eastern direction. This torus has an outer radius of ~15 pc, consistent with the constraints from radio observations.
Alexander Dave M.
Hough James H.
Packham Christopher
Ruiz Mariano
Young Scott
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