Other
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..623g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. 623-628.
Other
39
Active Galaxies, Cosmic Dust, Galactic Radio Waves, Interstellar Extinction, Polarization (Waves), Quasars, Radio Galaxies, Astronomical Polarimetry, Emission Spectra, Galactic Nuclei, Luminosity, Red Shift
Scientific paper
Data from a newly commissioned spectropolarimeter on the Hale 5-m telescope are presented which convincingly demonstrate that the continuum and broad-line region are polarized by transmission through aligned dust grains within the host galaxy of 3C 109 itself. The wavelength dependence of the polarization is well fitted by a combination of two Serkowski laws, one representing polarization within the Galaxy and the other representing polarization at the redshift of 3C 109. The large Balmer decrement of the broad lines also indicates the presence of reddening by dust. The narrow emission lines, such as forbidden O II 4959, 5007, are relatively unpolarized; the implications for the location of the dust are discussed. It is inferred that the dust grains in 3C 109 have a high polarizing ability, at least as great as the highest seen in the Galaxy's interstellar medium.
Cohen Marshall H.
Goodrich Robert W.
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