Milliarcsecond-scale polarization structure in the quasars 3C 279 and 3C 454.3.

Details Milliarcsecond-scale polarization structure in the quasars 3C 279 and 3C 454.3. Milliarcsecond-scale polarization structure in the quasars 3C 279 and 3C 454.3.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..861c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 278, No. 3, p. 861 - 868

Astronomy and Astrophysics

Astronomy

26

Techniques: Polarimetric -- Galaxies: Active -- Galaxies: Jets -- Quasars: General -- Quasars: Individual: 3C 279 -- Quasars: Individual: 3C 454.3, Quasars: Jets, Quasars: Radio Polarization, Quasars: Vlb Interferometry

Scientific paper

Polarization-sensitive global VLBI observations at λ = 6 cm of the quasars 3C 279 and 3C 454.3 are presented; these observations offer resolution ≡0.5 mas, corresponding to linear scales in the sources ≡2 pc. In both sources, the polarization associated with the jet emission indicates that the predominant jet magnetic field is longitudinal. In 3C 454.3, the magnetic field maintains alignment with the local jet direction even in places where the jet is highly curved. The degree of polarization in the jets ranges from 2 to 29 per cent, and is typically ≡15 to 20 per cent, indicating that the jet components are optically thin. The core of 3C 279 is rather weakly polarized (<1.6 per cent), while that of 3C 454.3 is more strongly polarized (≡4.6 per cent), suggesting that 3C 454.3 may have been in the process of giving birth to a new VLBI component at the epoch of the observations. Both sources were imaged at epochs at which new components had recently emerged from the core. The magnetic field in the innermost knot in 3C 279 appears to be aligned with the local jet direction, as is typical of quasars, while that in the innermost knot in 3C 454.3 seems to be perpendicular to the local jet direction, suggesting that this new component is associated with a transverse shock.

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