Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.339..669g&link_type=abstract
Monthly Notice of the Royal Astronomical Society, Volume 339, Issue 3, pp. 669-679.
Astronomy and Astrophysics
Astronomy
25
Polarization, Bl Lacertae Objects: Individual: 1803 + 784, Radio Continuum: Galaxies
Scientific paper
We present the results of VLBI polarization observations of the BL Lac object 1803+784 made simultaneously at 22, 15, 8 and 5 GHz in 1997 April, and quasi-simultaneously at 1.6 and 5 GHz in 1998 July. These data have yielded the total intensity, polarization, spectral-index, and rotation-measure distributions on scales from less than 1 mas to about 30 mas from the core (from a projected distance of about 1-150 pc at the redshift of 1803+784). There is an enhancement in the rotation measure for the VLBI core, clearly due to plasma in the immediate vicinity of the AGN. The rotation measures 10-30 mas from the core demonstrate that the Galactic contribution to the total observed rotation measures is equal to the previously reported integrated rotation measure (-61 rad m-2). After subtracting this Galactic contribution and multiplying by (1 +z)2, the rotation measure for the VLBI core in the source rest frame is about 500 rad m-2, similar to the VLBI core rotation measures reported previously for BL Lac and several quasars.
Chernetskii V. A.
Gabuzda Denise C.
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