Radio Polarization of BL Lacertae objects

Abstract

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.

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

References in corpus (3)

• Multi-colour optical monitoring of eight red blazars
• Near Infrared Intraday Variability of Mrk 421
• Polarization microvariability of BL Lac objects

Cited by in corpus (6)

• Optical Intra-day Variability in Blazars
• Short Term Flux and Colour Variations in Low-Energy Peaked Blazars
• Polarized Radio Sources: A Study of Luminosity, Redshift and Infrared Colors
• Incidence of MgII absorbers towards Blazars and the GRB/QSO puzzle
• Spectral Energy Distribution variation in BL Lacs and FSRQs
• Unification of BL Lac objects, FR I and FR II(G) radio galaxies and Doppler factor Estimation for BL Lac Objects