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Spectral Line Image Cube

The basic calibration procedure of spectral line shares the same Miriad tasks as discussed in the continuum data calibration. A step-by-step procedure of the reduction for SMA spectral line data (that was produced from old standard correlator mode with 24 spectral chunks per sideband) in Miriad was demonstrated. Here is a link to the detailed step-by-step procedure (Flow Chart and Script). In the follows, a few plots that were illustrated in the demostration are shown.

Figs. 4.5. and 4.6. show the antenna-based bandpass solutions solved from 3C 454.3 observed during the time between 14:00-14:45.

**Figure:** The solid dots are the solutions of bandpass in ampltiude which is color-coded for chunks. The solid black curves are the 5th order polynomial fit to the solutions.
$\begin{figure}\begin{center}\epsfxsize =11cm\leavevmode\epsfbox{fig4.5.ps} \end{center} \end{figure}$

**Figure:** The solid dots are the solutions of bandpass in the unwrapped phase which is color-coded for chunks. The solid black curves are the 5th order polynomial fit to the solutions.
$\begin{figure}\begin{center}\epsfxsize =11cm\leavevmode\epsfbox{fig4.6.ps} \end{center} \end{figure}$

It may be necessary to have bandpass solutions in more than one time intervals distributed evenly over the observing run so that any possible bandpass ripples can be checked and calibrated. In addition, baseline-based (and/or chunk-based) bandpass solutions with a strong point source may also be necessary for minimizing any correlator-based bandpass errors.

Subsections

Next: SPECTRA Up: Basics in Imaging, Deconvolution Previous: Self-calibration and Continuum Image

Jun-Hui Zhao (miriad for SMA)
2012-07-09