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Version 1.9 Build 1556

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imager.fitpsf - Function

	Package	synthesis
	Module	imager
	Tool	imager

Fit the point spread function, making psf image first if needed

Synopsis
fitpsf(psf, bmaj, bmin, bpa, async)

Description
This fits an elliptical Gaussian to the point spread function and returns the fitted beam parameters. If psf image is not specified then a psf is made and used. The values for the beam fit are saved internally and used whenever needed (for example in the functions restore or smooth) until invalidated. The values are invalidated by setdata, setimage or any tool function that changes the weights. Use the function summary to check if there is a valid fitted psf stored internally.

Arguments

psf	in	Name of input psf
		Allowed:	String
bmaj	out	Major axis of beam
		Allowed:	Quantity record
bmin	out	Minor axis of beam
		Allowed:	Quantity record
bpa	out	Position angle of beam
		Allowed:	Quantity record
async		Run asynchronously in the background
		Allowed:	Bool
		Default:	!dowait

Returns
Bool

Example

- imgr.makeimage(type='psf', image='3C273XC1.psf')
- majaxis:=[=]; minaxis:=[=]; pangle:=[=]
- imgr.fitpsf('3C273XC1.psf', bmaj=majaxis, bmin=minaxis, bpa=pangle, async=F)
- print bmaj, bmin, bpa
- imgr.restore(model='bla' , complist='', image='bla.restored' , residual='bla2.residual' )

Or if one wants to generate a psf from the uv coverage and use that subsequently as in the following example:

- imgr.fitpsf(psf='')
- imgr.restore(model='bla' , complist='', image='bla.restored' , residual='bla2.residual' )