Opened 14 years ago

Last modified 12 years ago

#200 new task

Routine for processing cross-scan data

Reported by: stacy.mader@… Owned by: Malte Marquarding
Priority: normal Milestone: Unified development
Component: General Version: 2.0
Severity: normal Keywords:
Cc:

Description

As the DFBs at Parkes do not have a total-power mode, one cannot use 'SPOT' scans (as done with the Multibeam correlator) to obtain flux calibration factors. However we can do 'spider-scans' (see below) and it would be nice to have a function in ASAP which could process a series of 'spider-scans' to extract flux calibration factors and other information. For the Multibeam correlator, total-power SPOT observations produce the following for each polarization:

Beam FWHM

ampR (amplitude of RA scans)

ampD (amplitude of DEC scans)

ON-OFF (baseline)

The calibration factors for each pol are then obtained using the following formula:

N x ((ON-OFF x 2) / (ampR + ampD))

N is the flux of the source in Jy (i.e., obtained from MIRIAD's calplot utility).

AZ-EL "spider" scans (..., -90, -45, 0, 45, 90, ...) are referenced to an RA/DEC position. The scans are conducted along the Great Circle passing through the source.

Change History (1)

comment:1 Changed 12 years ago by stacy.mader@…

There is now a utility called pyspot which addresses the above and is built on ASAP:

http://www.parkes.atnf.csiro.au/cgi-bin/public_wiki/wiki.pl?PySPOT

It also requires numpy and scipy.

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