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Reference Position
Up to two reference positions are allowed.
Figure 6.10:
The
Reference Position
,
Field Pattern
panel of the Scheduling Block Field Source Form
|
-
Coords Type
: Field center(s) in absolute or relative coordinates. In case
Absolute
is selected the specifications for the field center need to be provided. In case
Relative
the offset from the source coordinate shall be provided.
-
Reference Coodinates
: Coordinate System (ABSOLUTE only).
-
RA
: Absolute field center coordinate (RA) (ABSOLUTE only).
-
DEC
: Absolute field center coordinate (Dec) (ABSOLUTE only).
-
Offset[RA]
: RA offset from the source coordinate (RELATIVE only).
-
Offset[DEC]
: DEC offset from the source coordinate (RELATIVE only).
-
Integration Time
: This is the time spent off-source in a single dish observation.
-
Cycle Time
: This is the period between visits to the reference position.
-
Sub Scan Duration
: The number of seconds the subscan will take. This value must be an multiple of the integration duration.
-
Adjust subscan duration to a correct value
: Adjust the sub scan duration to fulfill thr requirements.
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The ALMA OT Team, 2011 May 20