Multi-Frequency Polarization Images of Extreme Radio Sources

Details Multi-Frequency Polarization Images of Extreme Radio Sources Multi-Frequency Polarization Images of Extreme Radio Sources

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717608b&link_type=abstract

American Astronomical Society Meeting 207, #176.08; Bulletin of the American Astronomical Society, Vol. 37, p.1449

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Scientific paper

Extragalactic radio sources with extreme spectra (e.g., emission increasing with frequency above 10 GHz) are a potentially troublesome source of foreground noise in searches for temperature and polarization fluctuations in the cosmic microwave background. They are also intrinsically interesting: such sources are likely to be the youngest or most recently activated AGN.
Maps of linear polarization at milli-arscec (roughly parsec) scales reveal physical properties and morphologies of the sources. Our multi-frequency polarization images allow us to disentangle morphological effects from Faraday depolarization, and hence to determine magnetic field alignment and rotation measure. We report preliminary results from 4 extreme sources, showing both polarization and spectral index images based on VLBA observations at 8, 15 and 22 GHz.

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