Astronomy and Astrophysics – Astronomy
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.303..158a&link_type=abstract
Nature (ISSN 0028-0836), vol. 303, May 12, 1983, p. 158, 159.
Astronomy and Astrophysics
Astronomy
87
Optical Polarization, Radio Sources (Astronomy), Seyfert Galaxies, Accretion Disks, Galactic Nuclei, Optical Thickness
Scientific paper
The orientations of the optical polarization to the radio structure in Seyfert 1 and 2 galaxies, particularly NGC1068 and NGC4151, are argued to be definitive evidence for a fundamental difference between the two classifications of galaxies. Optical polarimetry measurements were performed of numerous known Seyferts and those with intrinsic polarizations were retained for the study. Comparison of the optical data with recent, existing radio maps, revealed that Seyfert 1 optical polarizations appear parallel to the radio axis and Seyfert 2 polarizations tend to be perpendicular, at confidence intervals of less than 0.5 pct and 2.0 pct, respectively. The Seyfert 2 galaxies are noted to display stronger dilution of nuclear light than do Seyfert 1 galaxies, due to an extensive scattering depth. The conclusion is drawn that Seyfert 1 galaxies have thin scattering disks, while those of Seyfert 2 galaxies are thick.
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