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Resources: Field Sources

FieldSource forms are contained with the Field Sources folder. Each form defines the details of the source to be observed e.g. source name and positions, source properties and field pattern that shall be used for the observations. The latter may be a single point (possibly offset from the source position), multiple points, or some sort of OTF scan pattern. Presently, rectangular OTF patterns, a list of single points and a cross field pattern are supported.

Note that for observing objects in the in the solar system an JPL HORIZONS emphemeris can be uploaded. Details in the Section  6.3 .

Only one FieldSource may be attached to a Target.

The Field Source setup in the Schedblock also allows the user to define the source or sources to be used in the form of a query instead of a specific source. To select this Virtual Targets option check the box at the top of the editor that says Select target from ALMA Calibrator Catalogue at execution time . In the Target form in the Editors pane Field Source panel will replace with the Calibrator Search Parameters panel that provide the various query fields. The panel is identical to the CalibratorSearch Parameters panel in the Calibrator Selection Tool. For details see Section  5.2 and Figure  5.2 .

The query is constructed from a cone search over a given radius around a central RA/Dec (J2000) position, plus min/max frequency, min/max flux limits, and a time window since the calibrators were last observed. This query is stored in the SB, and at execution time Control will execute the query to retrieve sources matching it that will be observed. There is also a Maximum number of sources field which instructs control to observe up to this number of the results returned. Note that since only the ALMA Calibrator catalogue is searched the uses of this virtual target option are limited, but it is expected to find major use in Observatory Calibration modes.


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The ALMA OT Team, 2011 May 20