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