Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4808d&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #48.08; Bulletin of the American Astronomical Society, Vol. 34, p.1181
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on preliminary analysis of a multi-epoch VLBA observing program to monitor the magnetic field variations in the parsec-scale radio cores of three blazars: 2202+420 (z=0.07, prototype BL Lac), 1823+568 (z=0.66, QSO?), and 1749+096 (z=0.32, BL Lac). All three were observed at epochs 2001.60 and 2002.05 at frequencies of 15.4, 22.2, and 43.2 GHz. The cores of all three objects had moderate (5% - 20%) frequency-dependent fractional polarization. BL Lac continues to show a core-jet structure and two polarized superluminal components. The source 1823+568 shows a faint southern jet and possibly multiple components. The BL Lac object 1749+096 is essentially pointlike at all frequencies and at both epochs. We present two-epoch polarization and rotation measure images of these objects as well as a position angle calibration source (the quasar 2134+004). This work is supported by the National Science Foundation Grant AST-0206194.
Denn Grant Russell
Dreier C.
Helton Andrew
Lazarova Mariana S.
Mutel Robert L.
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