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In the sequence of data reduction, first and foremost key step is the editing of bad data, and
then follows the amplitude and phase calibration of the observed visibilities. The sequence of
various AIPS tasks that were used for data reduction is described below. A typical
AIPS task depends on a large number of parameters, called as `Verbs' and `Adverbs',
which control the behavior of the tasks. The settings of the relevant parameters used in each
of these tasks are discussed below:
- The FITS file is imported into AIPS using task FITLD.
This results into a multi-source visibility database, written in AIPS working
environment.
- The task INDXR was run to generate CL (ver 1) table. The task was
run using following settings: CPARM(3)=1, for a time interval of 1 minute, which are
made in CL (ver 1) table.
- The flux density of the flux/primary calibrators must be accurately set before
proceeding for further calibration. The flux density scale of the standard VLA flux
calibrators 3C48, 3C147 and 3C286 is encoded in the task SETJY. This task was
run using following settings: OPCODE='CALC', SOURCE='3C286, '3C147', '3C48',
''. OPCODE='CALC', which use the standard Baars et al. formulae and frequency
information from the header and determines the flux densities of primary calibrators
3C286, 3C48 and 3C147.
Subsections
Next: Flux density calibration
Up: Data Editing and Calibration
Previous: Data Editing and Calibration
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Manisha Jangam
2007-06-19