VLBI polarization images of eight compact active galactic nuclei at λ=1.3cm

Details VLBI polarization images of eight compact active galactic nuclei at λ=1.3cm VLBI polarization images of eight compact active galactic nuclei at λ=1.3cm

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319.1056g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 4, pp. 1056-1066.

Astronomy and Astrophysics

Astronomy

22

Polarization, Bl Lacertae Objects: General, Quasars: Individual: 3C279

Scientific paper

Global VLBI images in intensity and linear polarization at λ=1.3cm of the BL Lacertae objects 0235+164, 0300+470, 0735+178, 0954+658, 1803+784, 1823+568, and BL Lac and OVV quasar 3C279 are presented and analysed. These are the highest resolution polarization images currently available for several of these sources. On the whole, the tendencies observed at longer centimetre wavelengths are also exhibited in these 1.3-cm images. When core polarization is detected, the corresponding polarization angles χ tend to lie either parallel or perpendicular to the direction of the inner jet. The core degrees of polarization are usually comparable to those typical at 6cm, but somewhat lower in several cases, suggesting that the higher resolution data are better separating the contributions of intrinsically weakly polarized cores and highly polarized emerging knots. The observed χ vectors in the jets of 0735+178, 0954+658, 1823+568, BL Lac and 3C279 are aligned with the jet, implying the presence of transverse magnetic fields. In 0300+470 and BL Lac, there are regions where the direction of χ seems to be neither parallel nor perpendicular to the jet; it is not clear whether this is due to genuine obliquity of the magnetic field structure or to inadequate knowledge of the local flow direction.

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