Implications of the Cosmic Background Imager Polarization Data
\apj 660 (2007) 976-987
A 6-12 GHz analogue lag-correlator for radio interferometry
Astronomy and Astrophysics 464:2 (2007) 795
Abstract:
Aims. We describe a 6-12 GHz analogue correlator that has been developed for use in radio interferometers. Methods. We use a lag-correlator technique to synthesis eight complex spectral channels. Two schemes were considered for sampling the cross-correlation function, using either real or complex correlations, and we developed prototypes for both of them. We opted for the "add and square" detection scheme using Schottky diodes over the more commonly used active multipliers because the stability of the device is less critical. Results. We encountered an unexpected problem, in that there were errors in the lag spacings of up to ten percent of the unit spacing. To overcome this, we developed a calibration method using astronomical sources which corrects the effects of the non-uniform sampling as well as gain error and dispersion in the correlator. © ESO 2007.Clover A B-mode polarization experiment
\nar 50 (2006) 993-998
High‐significance Sunyaev–Zel'dovich measurement: Abell 1914 seen with the Arcminute Microkelvin Imager★
Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press (OUP) 369:1 (2006) l1-l4
High-significance Sunyaev-Zel’dovich measurement: Abell 1914 seen with the Arcminute Microkelvin Imager$^*$
\mnras 369 (2006) L1-L4