Establishing the flux density scale

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Establishing the flux density scale

Once an electronic gain solution (G_i) has been performed for all calibrator sources, those secondary sources which were assumed to be of unit flux density can be scaled to a primary flux density scale set by known calibrators included in the run. This is achieved using a utility function Calibrater.fluxscale, which takes as input the electronic gain calibration table, a list of primary and secondary sources, and the name of an optional output electronic gain calibration table. The gain factors in the output table will be scaled correctly once the function has completed. It will also report the estimated point source flux density for the secondary sources, based on the ratio of the mean gain modulus between the primary and secondary calibrators, as is standard practice in cases when this method can be used.

cal.fluxscale(tablein='polspec.gcal',         # Transfer flux density scale from 
              tableout='polspec.fluxscale',   # amplitude calibrator (3C286)
              reference='3C286', 
              transfer=['cal1','cal2'])
#
cal.done()                                    # Destroy calibrater tool

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