Submillimeter Array Polarimetry with Hertz

摘要: We describe the characteristics of 350 μm polarimeter Hertz learned from laboratory tests and recent observations at Caltech Submillimeter Observatory. contains a pair 32 element arrays with 18'' pixel spacing 20'' resolution. The instrument has been improved since initial in 1994 1995; detector noise is now below sky background noise. In excellent weather conditions on Mauna Kea, noise-equivalent flux density (NEFD) for measurement polarized 3-4 Jy Hz-1/2. subtraction correlated accomplished by two-array design crucial achieving this performance. A method analysis our polarization data presence described. instrumental less than 0.5% across array. Systematic errors are 0.2%. present map Sgr B2 140 detections greater 3 σ significance. For current database all measurements, median 1.1%.