ft – Insert a source model a visibility set: – imaging, calibration task

Description

A source model (souce.model image) or components list is converted into model visibilities that is inserted into the MODEL_DATA column or alternatively is stored in the header of the MS to be served on the fly when requested. This is needed to use more complicated sources than setjy provides; e.g resolved source or off centered sources in gaincal. (Setjy will automatically make this ft step.)

The sources currently available are 3C48, 3C138, 3C147, 3C286 at 1.4, 5.0, 8.4, 15, 22, 43 GHz. Their location is site dependent. In Charlottesville and at the SOC, the models are in /usr/lib/casapy/data/nrao/VLA/CalModels.

Parameters

Title

Parameter	Default	Description
vis	''
field	''
spw	''
model	''
nterms	int(1)
reffreq	''
complist	''
incremental	False
usescratch	False

Parameter Explanations

vis

''

Name of input visibility file (MS)

field

''

Field selection

spw

''

Spw selection

model

''

Name of input model image(s)

nterms

int(1)

Number of terms used to model the sky frequency dependence

reffreq

''

Reference frequency (e.g. '1.5e+9' or '1.5GHz')

complist

''

Name of component list

incremental

False

Add to the existing model visibility?

usescratch

False

If True predicted visibility is stored in MODEL_DATA column