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2008MNRAS.388.1766A - Mon. Not. R. Astron. Soc., 388, 1766-1774 (2008/August-3)
Incidence of the host galaxy on the measured optical linear polarization of blazars.
ANDRUCHOW I., CELLONE S.A. and ROMERO G.E.
Abstract (from CDS):
Our simulations show that, as expected, the measured polarization is always lower than the intrinsic value, due to the contamination by non-polarized star light from the host. This effect is more significant when the host is brighter than the active nucleus, and/or a large photometric aperture is used. On the other hand, if seeing changes along the observing time under certain particular conditions, spurious microvariability could be obtained, especially when using a small photometric aperture. We thus give some recommendations in order to minimize both unwanted effects, as well as basic guidelines to estimate a lower limit of the true (nuclear) polarization.
As an example, we apply the results of our simulations to real polarimetric observations, with high temporal resolution, of the blazar PKS0521-365.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): galaxies: active - BL Lacertae objects: individual: PKS0521-365
Simbad objects: 1
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