Optical polarization of the Seyfert galaxies IC 4329A and MRK 376

Details Optical polarization of the Seyfert galaxies IC 4329A and MRK 376 Optical polarization of the Seyfert galaxies IC 4329A and MRK 376

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255...65m&link_type=abstract

Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 65-69. Research supported by the Natural Sciences and Engineering Res

Astronomy and Astrophysics

Astrophysics

21

Interstellar Matter, Linear Polarization, Optical Polarization, Seyfert Galaxies, Astronomical Spectroscopy, Balmer Series, Cosmic Dust, Disk Galaxies, Granular Materials

Scientific paper

Measurements of the optical polarizations of the two highly polarized Seyfert 1 galaxies IC 4329A and Mrk 376 are presented. Continuum and line polarization of the two objects were observed with the Steward Observatory 2.25-m telescope using a two-channel photoelectric Pockels cell polarimeter, a single-channel scanner, and a digicon attached to a flint prism spectrograph. Results indicate that, for both galaxies, the emission line polarization and underlying continuum polarization are identical, rising toward short wavelengths, and therefore must be explained by a common mechanism. Such a mechanism is suggested to involve polarization produced by aligned grains in the galactic disk. A model for polarization in IC 4329A by this mechanism predicts a grain size three times smaller than Galactic polarizing grains, as well as a visual extinction of about 2 magnitudes, a gas to dust mass ratio close to 100 and a polarization to extinction ratio comparable to the Galactic ratio.

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