Radio Polarization of BL Lacertae objects

Details Radio Polarization of BL Lacertae objects Radio Polarization of BL Lacertae objects

2006-11-13

arxiv.org/abs/astro-ph/0611383v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, 1 table. PASJ, in press

Scientific paper

In this paper, using the database of the university of Michigan Radio Astronomy Observatory (UMRAO) at three (4.8 GHz, 8 GHZ, and 14.5 GHz) radio frequencies, we studied the polarization properties for 47 BL Lacertae objects(38 radio selected BL Lacertae objects, 7 X-ray selected BL Lacertae, and two inter-middle objects (Mkn 421 and Mkn 501), and found that (1) The polarizations at higher radio frequency is higher than those at lower frequency, (2) The variability of polarization at higher radio frequency is higher than those at lower frequency, (3) The polarization is correlated with the radio spectral index, and (4) The polarization is correlated with core-dominance parameter for those objects with known core-dominance parameters suggesting that the relativistic beaming could explain the polarization characteristic of BL Lacs.

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