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Field Sources

To define the Field Source parameters (FieldSource), select on the Field Source folder in Resources. Via Edit $\rightarrow$ Add Field Source you can now add a blank FieldSource to the Field Source folder. Alternatively, you can right click and select Add Field Source from the pop-up menu. Then, when selecting the newly created FieldSource the empty Field Source form is displayed in the Editors pane.

In the FieldSource form the source properties should be provided. At the top of the form, using the Name field the name of this parameter set can be specified. Next, you can enter the object name in the Source Name field. Clicking on the Resolve button may resolve subsequent source parameters in the form automatically (e.g. the coordinates). A window will display the server name that returned the query results. A tick box is available for solar system objects with non-sidereal motions. Known flux information of the source can be added into a table.

Figure 8.7: The upper part of the Field Source form with the Fields Source and Reference Positions panels. Because the Use Reference box is tagged, the fields in the Reference Position section are made visible.
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In the case of single dish observations with on/off source integrations, the user should tick the Use Reference box. This will expand the Reference Position panel, where the reference position and the on and off integration times should be given. A second reference tab can be added and deleted using the Add and Delete buttons. For interferometric observations the Use Reference box should remain unchecked.

The Field Pattern panel can be used to define the area to be mapped and contains a drop down menu for specifying the actual pointing pattern of the observation, with the source coordinates as the origin of the pattern. When selecting a pointing pattern the parameters should be provided in the panel below the Field Pattern panel. An example of this panel in the case of the rectangular pointing pattern is given in Figure  8.8 .

Figure 8.8: The lower part of the FieldSource form with the FieldPatternEditor and field pattern properties ( rectangle ) panels.
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Currently, the pointing types point , rectangle and cross are supported. Others will follow. In the case of single pointing, one can specify the pointing in absolute coordinates or relative to the source position. Hence, this structure allows you to point in a specific region of your target. Note that the single pointing type allows one to add more pointings. This is to support arbitrary pointing patterns in case the user does not want to select the standard pointing field patterns provided.

After having created one or more FieldSources and having filled out the forms, clicking on the Field Sources folder shows a table of the available FieldSources in the Editors pane.


next up previous contents index
Next: About Basebands, SideBands and Up: Resources Previous: Resources   Contents   Index
The ALMA OT Team, 2011 May 20