43 and 86 GHz VLBI Polarimetry of 3C454.3

Details 43 and 86 GHz VLBI Polarimetry of 3C454.3 43 and 86 GHz VLBI Polarimetry of 3C454.3

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517806h&link_type=abstract

American Astronomical Society Meeting 205, #178.06; Bulletin of the American Astronomical Society, Vol. 37, p.382

Astronomy and Astrophysics

Astronomy

Scientific paper

Very Long Baseline Array (VLBA) observations of the quasar 3C454.3 were made at epoch 2003.75, at 43 and 86 GHz in full polarization mode. Very Long Baseline Polarimetry (VLBP) is used to determine magnetic field structures in the jets of extragalactic radio sources at very high angular resolution - on the order of 0.3 milliarcseconds at 86 GHz. As Faraday rotation decreases with decreasing wavelength, high-frequency, high-resolution VLBP observations allow us to probe the polarization properties of Active Galactic Nuclei (AGNs) close to the super-massive black holes thought to be the central engines of these objects. New total intensity and linear polarization images of 3C454.3 at both 43 and 86 GHz are presented here, along with historical images for comparison. The new images include the first 86 GHz linear polarization images ever made of the source 3C454.3, and these results bring the number of sources for which successful 86 GHz polarimetry has been accomplished to three. As 3C454.3 is fainter at 86 GHz than its counterparts 3C273 and 3C279, the new observations are quite promising for the success of 86 GHz VLBP on weaker sources.
This research was carried out as part of MIT Haystack Observatory's Research Experiences for Undergraduates program funded by the National Science Foundation.

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