Infrared Polarization and Beaming Effect for BL Lac Objects

With the idea of the beaming models, we derive a relation between the observed polarization and Doppler-corrected magnitude, that is, the observed polarization is in anti-correlation with the Doppler-corrected magnitude. Making use of the infrared data observed simultaneously by Impey et al. Mon. Not. R. Astron. Soc. 200 (1982) 19; 209 (1984) 245 and Holmes et al. ibid. 210 (1984) 961 we found that (1) there is a significant correlation between the observed maximum polarization and Doppler-corrected magnitude but the polarization is not in anti-correlation with the Doppler corrected magnitude; (2) the maximum infrared polarization is strongly correlated with the maximum optical polarization. Our conclusion is that the infrared polarization depends only on the degree of ordering of the magnetic field in the synchotron
emission regions and not on the beaming effect. Both infrared and optical emissions originate from the synchrotron radiation.