Continuum polarimetry case

Version 1.9 Build 803

News	FAQ
Search	Home

Next: Spectral-line case Up: Interactive editing Previous: Interactive editing

Continuum polarimetry case

Examine the data in ap366.ms using msplot. First, plot calibrator data in FIELD_ID 11 (1328+307 = 3c286 - the flux calibrator). In the msplot control panel (see e.g. Fig. 1.5):
Choose the plot type PLOT X VS Y.
Select X AXIS=uvdist.
Select Y AXIS=amplitude.
Click on the Go button to make the plot in Fig. 1.7.
Use the locate button to identify low points.
Observed data points between 0.7 and 0.8 Jy are the RR & LL correlations (corresponding to the actual amplitudes of the uv data). Plot data in an XY plot with time vs. amplitude next. The lower points near 0.1 Jy are the RL & LR correlations. Repeat this procedure for FIELD_ID 9 (0917+624 - the gain calibrator). The calibrator data look very good - there are no major outliers so you do not have to edit this data before calibration.

**Figure 1.7:** `msplot` of the calibrators in the VLA continuum dataset example. **Left:** 3c286, the flux calibrator. **Right:** 0917+624 - the gain calibrator.
$\begin{figure}\centering\leavevmode \epsfxsize =.45\columnwidth \epsfbox{cookb... ...columnwidth \epsfbox{cookbook.dir/vla.msplotC.gcal.ps} \hrulefill \end{figure}$

It is best not to edit or flag source data until after it is calibrated.

Next: Spectral-line case Up: Interactive editing Previous: Interactive editing Contents