A survey of the milliarcsecond polarization properties of BL Lacertae objects at 5 GHz

Details A survey of the milliarcsecond polarization properties of BL Lacertae objects at 5 GHz A survey of the milliarcsecond polarization properties of BL Lacertae objects at 5 GHz

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388...40g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, March 20, 1992, p. 40-54.

Astronomy and Astrophysics

Astronomy

118

Bl Lacertae Objects, Polarization Characteristics, Radio Sources (Astronomy), Sky Surveys (Astronomy), Linear Polarization, Radio Jets (Astronomy), Red Shift, Very Long Base Interferometry

Scientific paper

Consideration is given to millarcsecond-resolution total-intensity and linear polarization maps at 5 GHz presented for 11 BL Lacertae objects. In every BL Lacertae object in which polarization structure was detected, the polarization position angle of the knots is nearly parallel to the VLBI structural axis. The direction of the polarization in the cores of these sources appears to be random. The preferred polarization direction in the jets is explained by the fact that plane perpendicular shock waves are common in these sources; the origin of the absence of the preferred polarization direction in the core components is unclear. These results support an early conclusion that it cannot be the case that a significant number of BL Lacertae objects are gravitationally microlensed images of more distant quasars, since the characteristic VLBI polarization structures observed in these two types of objects are very different.

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