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Individual Pointing(s)

In this case, you can specify a number of closely spaced (within 10 degrees on sky) sources, each to be observed with a number of offset pointings if required. The limitation is now on the total number of pointings, which can be 150 at most. Note that all pointings entered for a given source share the velocity and target information entered in Step 3.4.

You can visualise and configure the spatial setup for each source individually by selecting the relevant source tab. You should first query the image server or load your own image for each target. To define multiple pointings you can manually Add the offsets from the position specified in the Source Coordinates field, specify the coordinates directly (untick the Pointing Pattern: Offset box), or graphically add fields of view in the spatial visual editor using the Add a FOV button (see Fig. 3.7). By default, the OT will assume you want to process multiple pointings defined for a given source as a single image (Custom Mosaic box ticked); in this case the individual pointings must not be placed more than a primary beam apart. If you un-tick the box each pointing will be processed separately. If ACA observations are requested (Step 3.8) these will have the same pointing centers as the 12-m pointings; any custom-defined mosaic will not be adjusted for the larger primary beam size of the 7-m antennas. Also, the sensitivity specified in Step 3.8 is assumed to be per pointing and the estimate entered should take into account any overlap.


next up previous contents
Next: One Rectangular field (mosaic) Up: Finalise the spatial setup Previous: Finalise the spatial setup   Contents
The ALMA OT Team, 2014 May 21