Microwave SED’s and Polarizations of a High-Frequency-Selected Sample of Radio Galaxies

Details Microwave SED’s and Polarizations of a High-Frequency-Selected Sample of Radio Galaxies Microwave SED’s and Polarizations of a High-Frequency-Selected Sample of Radio Galaxies

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560209s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #602.09; Bulletin of the American Astronomical Society, Vol. 36, p.1122

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the VLA, we have constructed microwave SED’s of 156 extragalactic radio sources drawn from the AT20G survey. These sources were selected at 20 GHz, and we find that 14% in our sample had inverted spectra above 8 GHz, and 8% above 22 GHz. They are thus the kind of source most likely to interfere with searches for cosmic microwave background anisotropies on small scales, generally carried out at frequencies above 30 GHz.
In view of the interest in polarized fluctuations in the cosmic microwave background, we also measure the polarization percentage at 4.86, 8.46, 22.46 and 43.34 GHz. Final values will be reported; preliminary results show a median polarization of 2.6% at 8.46 GHz and 4.6% at 43.34 GHz.

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