AAS 201st Meeting, January, 2003
Session 48. Blazars and AGNs
Poster, Tuesday, January 7, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[48.08] Multi-Epoch Monitoring of Magnetic Field Structures in Three Blazars

G. R. Denn (Sweet Briar College), R. L. Mutel (University of Iowa), M. S. Lazarova (Sweet Briar College), C. Dreier (Oberlin College), A Helton (University of Iowa)

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.

The author(s) of this abstract have provided an email address for comments about the abstract: gdenn@sbc.edu

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.