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| − | == Help on setjy task: ==
| + | {{setjy}} |
| − | <pre>
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| − | Fills the model column with the visibility of a calibrator
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| − | | |
| − | The task places the model visibility amp and phase associated
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| − | with a specified source (generally a calibrator).
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| − | The simplest way to to enter the flux density
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| − | (I,Q,U,V) explicitly, but this is valid only for a point source.
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| − | | |
| − | For an extended source, the clean model (image.model) can be
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| − | specified and the model visibilities associated with this clean
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| − | model is placed in the visibility model column.
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| − | | |
| − | Models are available for 3C48, 3C138, 3C286 between
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| − | 1.4 and 43 GHz. 3C147 is available above 13 GHz. These models
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| − | are scaled to the precise frequency of the data. Only I source
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| − | model can be inserted at a time.
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| − | | |
| − | The location of the models are system dependent: At the AOC and CV,
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| − | the models are in the directory::/usr/lib/casapy/data/nrao/VLA/CalModels
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| − | or /usr/lib64/casapy/data/nrao/VLA/CalModel.
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| − | | |
| − | Setjy need only be run on the calibrator sources with a know flux
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| − | density and/or model.
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| − | | |
| − | Keyword arguments:
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| − | vis -- Name of input visibility file
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| − | default: none. example: vis='ngc5921.ms'
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| − | field -- Select field using field id(s) or field name(s).
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| − | default: ''=all fields, but run setjy one field at a time.
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| − | [run listobs to obtain the list id's or names of calibrators]
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| − | If field string is a non-negative integer, it is assumed a field index
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| − | otherwise, it is assumed a field name
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| − | field='0~2'; field ids 0,1,2
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| − | field='0,4,5~7'; field ids 0,4,5,6,7
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| − | field='3C286,3C295'; field named 3C286 adn 3C295
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| − | field = '3,4C*'; field id 3, all names starting with 4C
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| − | spw -- Select spectral window/channels
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| − | default: ''=all spectral windows and channels
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| − | spw='0~2,4'; spectral windows 0,1,2,4 (all channels)
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| − | spw='<2'; spectral windows less than 2 (i.e. 0,1)
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| − | spw='0:5~61'; spw 0, channels 5 to 61
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| − | spw='0,10,3:3~45'; spw 0,10 all channels, spw 3, channels 3 to 45.
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| − | spw='0~2:2~6'; spw 0,1,2 with channels 2 through 6 in each.
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| − | spw='0:0~10;15~60'; spectral window 0 with channels 0-10,15-60
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| − | spw='0:0~10,1:20~30,2:1;2;4'; spw 0, channels 0-10,
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| − | spw 1, channels 20-30, and spw 2, channels, 1,2 and 4
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| − | field='3C286,3C295'; field named 3C286 adn 3C295
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| − | field = '3,4C*'; field id 3, all names starting with 4C
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| − | spw -- Select spectral window/channels
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| − | default: ''=all spectral windows and channels
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| − | spw='0~2,4'; spectral windows 0,1,2,4 (all channels)
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| − | spw='<2'; spectral windows less than 2 (i.e. 0,1)
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| − | spw='0:5~61'; spw 0, channels 5 to 61
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| − | spw='0,10,3:3~45'; spw 0,10 all channels, spw 3, channels 3 to 45.
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| − | spw='0~2:2~6'; spw 0,1,2 with channels 2 through 6 in each.
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| − | spw='0:0~10;15~60'; spectral window 0 with channels 0-10,15-60
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| − | spw='0:0~10,1:20~30,2:1;2;4'; spw 0, channels 0-10,
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| − | spw 1, channels 20-30, and spw 2, channels, 1,2 and 4
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| − | | |
| − | Use one of the two methods below: modimage or fluxdensity
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| − | | |
| − | modimage -- Model image (I only) from which the model visibilities
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| − | default: '' means do not use model, but fluxdensity
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| − | Each field must be done separately. The image clean model
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| − | will be scaled from the frequency in the model to that actually used.
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| − | Both the amplitude and phase are calculated.
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| − | At the AOC or CV, the models are located in the
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| − | /usr/lib/casapy/data/nrao/VLA/CalModels/3C286_L.im (egs)
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| − | lib64
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| − | | |
| − | fluxdensity -- Specified flux density [I,Q,U,V] in Jy
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| − | default => -1, places [1,0,0,0] flux density for all sources,
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| − | except for 3C286, 3C48 and 3C147 where the absolute flux
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| − | density it added. It is recommended to use the modimage for
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| − | these sources if they are resolved with the observations.
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| − | Only one flux density can be executed at a time. The phases are
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| − | set to zero.
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| − | example fluxdensity=-1 will insert 1.0 for all calibrators
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| − | except 3C286, 3C147 and 3C48
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| − | example field = '1'; fluxdensity=[3.2,0,0,0] wil put in
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| − | flux density of I=3.2 for field='1'
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| − | | |
| − | At present, this is the only method to insert a polarized flux
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| − | density model (June 2000).
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| − | example: fluxdensity=[2.63,0.21,-0.33,0.02]
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| − | will put in I,Q,U,V flux densities of 2.63,0.21,-0.33,
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| − | and 0.02, respectively, in the model column.
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| − | | |
| − | standard -- Flux density standard, used if fluxdensity<0
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| − | default: 'Perley-Taylor 99'; example: standard='Baars'
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| − | Options: 'Baars','Perley 90','Perley-Taylor 95',
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| − | 'Perley-Taylor 99'
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| − | </pre>
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