Quasar Host Orientation and Polarization: Insights into the Type 1/Type 2 Dichotomy

Details Quasar Host Orientation and Polarization: Insights into the Type 1/Type 2 Dichotomy Quasar Host Orientation and Polarization: Insights into the Type 1/Type 2 Dichotomy

2007-10-22

arxiv.org/abs/0710.4072v2

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure, to appear in "The Nuclear Region, Host Galaxy and Environment of Active Galaxies", eds. E. Benitez, I. Cruz

Scientific paper

We investigate correlations between the optical linear polarization position angle and the orientation of the host galaxy/extended emission of Type 1 and Type 2 Radio-Loud (RL) and Radio-Quiet (RQ) quasars. We have used high resolution Hubble Space Telescope (HST) data and deconvolution process to obtain a good determination of the host galaxy orientation. With these new measurements and a compilation of data from the literature, we find a significant correlation between the polarization position angle and the position angle of the major axis of the host galaxy/extended emission. The correlation appears different for Type 1 and Type 2 objects and depends on the redshift of the source. Interpretations in the framework of the unification model are discussed.

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