2.3.1.0 imager.setjy

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imager.setjy - Function

2.3.1 Compute the model visibility for a specified source flux density
Description

Compute the model visibility for a specified source flux density, and insert into the MODEL_DATA column. The source flux density for a set of standard flux density reference sources may optionally be pre-computed, by setting the input flux density to -1 (the default). At present, these include 3C286, 3C48, 3C147, 3C138, and 1934-638. In this case, if the source is not in this set, an unpolarized flux density of 1 Jy will be assumed. Users may also specify standard=’SOURCE’ to use the model(s) in the SOURCE_MODEL column of the SOURCE subtable.

Users may also specify a model image that will be scaled to the specified total flux density (or that computed for reference sources). When a model image is specified, setjy will only permit processing one field, and will currently only process Stokes I.

Arguments


Inputs
field	Field Id (0-relative) or name
	allowed:	any
	Default:	variant
spw	Spectral Window Id. (0-relative)
	allowed:	any
	Default:	variant
modimage	A model image
	allowed:	string
	Default:
fluxdensity	Specified flux density (I,Q,U,V) in Jy (lookup the value; use 1.0 if not found)
	allowed:	doubleArray
	Default:	0.0 0.0 0.0 0.0
standard	Flux density standard
	allowed:	string
	Default:	Baars Perley 90 Perley-Taylor 95 Perley-Taylor 99 SOURCE

Returns
bool

Example

im.setjy(fieldid=2, spwid=-1, fluxdensity=[2.6,0.2,0.3,0.5],standard=’Baars’)

Compute the model visibility for field id. 2 to the specified point-source (I,Q,U,V) for all spectral windows id.’s on the Baars flux density scale.

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