SMA MIRIAD 2017 Tools

A GUIDE FOR HANDLING SWARM HIGH-ANGULAR RESOLUTION DATA - since 2017

Residual delay corrections for broadband continuum -

Steps -

1. Find a nearby compact source as a calibrator
2. Constrict a pesudo point-source model at a phase center
3. Split the calibrator source into scan-based subsets
4. Solve for bandpass from each of the scan-based subsets
5. Normalize the bandpass solutions
6. Inspect the phase plots of the relevant spectra to determine the magnitude of phase slope due to residual delay
7. Fit the spectral phase to a linear or a polinomial function of time
8. Interpolate the phase solutions to the target source in time

Miriad programs -

Scripts -

Steps -

1. Find a few compact sources with a good elevation coverage as calibrators
2. Constrict pesudo point-source models at a phase center for each of them
3. Split the calibrator sources into scan-based subsets
4. Solve for bandpass from each of the scan-based subsets
5. Normalize the bandpass solutions
6. Inspect the phase plots of the relevant spectra to determine the magnitude of phase slope due to residual delay
7. Fit the spectral phase to a parabolic or a polinomial function of elevation
8. Interpolate the phase solutions to the target source in elevation

Miriad programs -

Scripts -

Correction for residual delay due to atmosphere -

Steps -

Miriad programs -

Scripts -

Steps -

Miriad programs -

Scripts -

References -

1. Interferometry and Synthesis in Radio Astronomy, 3rd edition, A. Richard Thompson, James M. Moran, George W. Swenson Jr., Springer (2017)
2.The am atmospheric model, Scott Paine, SMA Technical Memo 152 (2017)
3.Total Power Atmospheric Phase Correction at the SMA, James Battat, SMA Technical Memo 154 (2004)
4. Delay Errors in Single- and Double-Sideband Interferometer Systems A. R. Thompson, L. R. D'ddario, D. T. Emerson and P. J. Napier, ALMA Memo 561 (2006)
5. Radio path length correction using water vapour radiometry, R. J. Sault, G. J. Carrad, P. J. Hall, J. Crofts, arXiv:astro-ph/0701016 (2006)