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Finalise the spatial setup

Having specified the spectral setup and in particular the representative frequency, you are now ready to finalise the spatial setup based on the sources you defined in Step 3.4. The maximum total number of 12-m pointings is 150, regardless of whether these are treated as mosaics, offset pointings, or separate sources. 7-m ACA pointings are counted separately.

to to by -2 bp The spatial editor
The spatial editor (see Fig. 3.7) is found under the Spatial tab of the Field Setup editor. It can be used to view and edit pointings on a per source basis and will work properly only if you load an image. Either Query one of the image servers selected from the drop-down menu to display a catalogue image of the area surrounding your source, or load and display your own FITS image by clicking the folder icon in the spatial editor toolbar (only J2000 equatorial coordinates are supported). The primary beams of the pointings defined are represented by red circles, and can be moved, added and deleted interactively. They can be displayed for either the 12-m or the 7-m antennas if ACA observations have been requested. If Total Power observations are requested, the area scanned is shown by a turquoise box. For individual pointings, this box dynamically adapts to cover the pointings defined. You can use the buttons in the toolbar above and below the spatial viewer to perform simple visualisation operations such as adjusting the cut levels, zooming, and saving the image. Please see OT video tutorial 3: The Spatial Field Setup for a practical demonstration of all functionalities. 0.85 0.85 0.85 rg


width height depth 0 0 0 rg =0bpto

to to by -2 bp
Image Warning-icon-hi The response of the receivers is not uniform across the antenna primary beam, but falls off towards the beam edges. The primary beam (represented by the red circles) is defined as the FWHM of the PSF. For rectangular mosaics, the falloff in sensitivity towards the beam edges is automatically taken into account by the fact that the individual pointings are set up so as to overlap. For single pointings, the source should fit within the central 1/3 of the primary beam for a more or less uniform sensitivity coverage; else a small mosaic should be set up. The inner third of the primary beam is shown by the smaller green circle in the spatial editor.
0.85 0.85 0.85 rg


width height depth 0 0 0 rg =0bpto

Figure 3.7: Visualisation of individual pointings in the spatial tab of the Field Setup pane.
Image fig8

Figure 3.8: Visualisation of a rectangular mosaic.
Image fig9



Subsections
next up previous contents
Next: Individual Pointing(s) Up: Proposal creation and submission Previous: The representative frequency   Contents
The ALMA OT Team, 2016 Aug 23