Establishing the flux density scale

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Establishing the flux density scale

For point sources of unknown flux density, but for which valid solutions have been derived against a unit point source model, the absolute flux density can be established by scaling the mean gain moduli against those of the known amplitude calibrators recognized by Imager.setjy. This scaling is achieved by adjusting the G Jones calibration table, after determining the amplitude calibration factors, as:

cal.fluxscale(tablein='cal.G', reference='1934-638',     # scale the gains
              transfer="0405-385 2254-367");
cal.done();

In this case, the amplitude scale is set with 1934638 as the reference. The calibration table cal.G will be updated with the scaled G Jones calibration factors, and will be used going forward in the reduction.

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