THE DIFFERENCE OF OPTICAL POLARIZATION PROPERTIES BETWEEN XBLs AND RBLs |
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Authors: | Xie Guang-zhong Mei Dong-cheng Dai Ben-zhong |
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Affiliation: | Yunnan Astronomical Observatory, Chinese Academy of Science, Kunming 650011, China; The National Astronomical Observatories Chinese Academy of Sciences, Beijing 100080, China; Yunnan Astrophysics Center, Yunnan University, Kunming 650091, China |
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Abstract: | On the basis of the beaming model, we have derived a relation between the observed polarization (Pob) and Doppler-corrected optical magnitude (mcorr), log Pob=0.4(1-k) mcorr+C. We tested the correlation between Pob} and mcorr. The main results are as follows: (1) for both high and low states, there are strong correlations between Pob and mcorr for 29 RBLs with well-observed polarization and Doppler factor, where mcorr=mob+(3+α)logδ/0.4, and δ is the optical Doppler factor; (2) no correlation exists between Pob and the observed optical magnitude, mob, for the 29 RBLs in high state, but there is a close correlation for the 29 RBLs in low state; (3) however, there is an obvious anti-correlation between Pob and mcorr for 35 XBLs with good simultaneous observation data. Our results show that (i) a new difference in polarization is found between RBLs and XBLs; (ii) this difference in polarization between RBLs and XBLs seems really to be physical differences. |
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Keywords: | BL Lac objects polarization beaming effect |
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