Polarization of the blackbody radiation at 3.2 centimeters

Details Polarization of the blackbody radiation at 3.2 centimeters Polarization of the blackbody radiation at 3.2 centimeters

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..341n&link_type=abstract

Astrophysical Journal, Part 1, vol. 232, Sept. 1, 1979, p. 341-347. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

39

Black Body Radiation, Faraday Effect, Microwave Emission, Polarization Characteristics, Calibrating, Linear Polarization, Polarimeters, Radiation Detectors, Superhigh Frequencies

Scientific paper

An attempt is made to detect linear polarization in the 2.7 K background at a wavelength of 3.2 cm, using a Faraday-switched polarimeter pointed to the zenith where the earth's rotation carries through a circle of constant (40.35 deg N) declination. A two-step calibration process was employed. First, the change in dc voltage at the second detector was measured with a 300 K absorber to determine the gain of the microwave front end. Then, by inserting a known ac voltage at the lock-in frequency at the same point, the rest of the receiver was calibrated. The null result was interpreted using Rees' axially symmetric model as an upper limit on asymmetry in the Hubble expansion.

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