Quasi-optical reflective polarimeter for wide millimeter-wave band

Hiroko Shinnaga; Masato Tsuboi; Takashi Kasuga

doi:10.1117/12.331152

13 November 1998 Quasi-optical reflective polarimeter for wide millimeter-wave band

Hiroko Shinnaga, Masato Tsuboi, Takashi Kasuga

Proceedings Volume 3465, Millimeter and Submillimeter Waves IV; (1998) https://doi.org/10.1117/12.331152
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

We constructed a new reflective-type polarimeter system at 35 - 250 GHz for the 45 m telescope at Nobeyama Radio Observatory (NRO). Using the system, we can measure both linear polarization and circular polarization for our needs. The new system has two key points. First is that we can tune the center frequency of the polarimeter in the available frequency range, second is that insertion loss is low (0.15 plus or minus 0.03 dB at 86 GHz). These characteristics extended achievable scientific aims. In this paper, we present the design and the performance of the system. Using the system, we measured linear polarizations of some astronomical objects at 86 GHz, with SiO (nu) equals 0,1 and 2 at J equals 2 - 1 and ²⁹SiO (nu) equals 0 J equals 2 - 1 simultaneously. As a result, the observation revealed SiO (nu) equals 0 J equals 2 - 1 of VY Canis Majoris is highly linearly polarized, the degree of linear polarization is up to 64%, in spite of SiO J equals 2 - 1 (nu) equals 1 is not highly linearly polarized. The highly linearly polarized feature is a strong evidence that ²⁸SiO J equals 2 - 1 transition at the ground vibrational state originate through maser action. This is the first detection of the cosmic maser emission of SiO (nu) equals 0 J equals 2 - 1 transition.

Citation Download Citation

Hiroko Shinnaga, Masato Tsuboi, and Takashi Kasuga "Quasi-optical reflective polarimeter for wide millimeter-wave band", Proc. SPIE 3465, Millimeter and Submillimeter Waves IV, (13 November 1998); https://doi.org/10.1117/12.331152

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