Mapping Cygnus A at 3 millimeter wavelength with the MIRIAD system
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We describe the use of the MIRIAD software system in the calibration and mapping of the radio galaxy Cygnus A at frequencies from 86 to 103 GHz. The observations were reduced using a simple mosaicing task as well as a calibration and self-calibration process that handles multiple frequency channels and multiple pointing centers. The reduction process has been automated, with the needed sequence of commands given by a UNIX shell script. We present a 2″ resolution image which resolves the hot spots in each radio lobe, and a multifrequency image with 21″ resolution which determines the extent of the diffuse emission in the extended radio lobes