Attempts carried out in the past to detect linear or circular polarization of the Cosmic Microwave Background (CMB) radiation have produced only upper limits to the degree of polarization. These limits are at least two orders of magnitude above the expected value of few times 10(-6) or less, as suggested by models combined with the measured values of the CMB anisotropy. Because detection of polarization of the Cosmic Microwave Background will improve our knowledge of the phenomena which accompanied the evolution of the Universe, we built a polarimeter whose sensitivity, 2.1/root t(s) mK, is sufficient to detect linear or circular polarization at level of few mu K. Details of the system are presented. A testing campaign carried out with a partial prototype of our polarimeter, in a noisy environment, gave an upper limit to the degree of linear polarization of the CMB on angular scales of 14 degrees of similar to 8 . 10(-5), comparable to the limits at similar angular scales so far published. (C) 1998 Elsevier Science B.V.

Sironi, G., Boella, G., Bonelli, G., Brunetti, L., Cavaliere, F., Gervasi, M., et al. (1997). A 33 GHz polarimeter for observations of the cosmic microwave background. NEW ASTRONOMY, 3(1), 1-13.

A 33 GHz polarimeter for observations of the cosmic microwave background

SIRONI, GIORGIO;BOELLA, GIULIANO FILIPPO;GERVASI, MASSIMO;PASSERINI, ANDREA
1997

Abstract

Attempts carried out in the past to detect linear or circular polarization of the Cosmic Microwave Background (CMB) radiation have produced only upper limits to the degree of polarization. These limits are at least two orders of magnitude above the expected value of few times 10(-6) or less, as suggested by models combined with the measured values of the CMB anisotropy. Because detection of polarization of the Cosmic Microwave Background will improve our knowledge of the phenomena which accompanied the evolution of the Universe, we built a polarimeter whose sensitivity, 2.1/root t(s) mK, is sufficient to detect linear or circular polarization at level of few mu K. Details of the system are presented. A testing campaign carried out with a partial prototype of our polarimeter, in a noisy environment, gave an upper limit to the degree of linear polarization of the CMB on angular scales of 14 degrees of similar to 8 . 10(-5), comparable to the limits at similar angular scales so far published. (C) 1998 Elsevier Science B.V.
No
Articolo in rivista - Articolo scientifico
Scientifica
Cosmic microwave background; Polarization; Techniques: polarimetric; Instrumentation polarimeters
English
1
13
13
Sironi, G., Boella, G., Bonelli, G., Brunetti, L., Cavaliere, F., Gervasi, M., et al. (1997). A 33 GHz polarimeter for observations of the cosmic microwave background. NEW ASTRONOMY, 3(1), 1-13.
Sironi, G; Boella, G; Bonelli, G; Brunetti, L; Cavaliere, F; Gervasi, M; Giardino, G; Passerini, A
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/34279
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