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| Paper: |
CRYSTALBALL: A Numba and Dask-Accelerated Fourier Transform of a Sky Model into an Interferometry Dataset |
| Volume: |
532, ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS XXX |
| Page: |
409 |
| Authors: |
Serra, P.; Perkins, S.; Smirnov, O. |
| Abstract: |
Producing an astronomical image from the data generated by a radio interferometer involves calibrating and Fourier-transforming the observed set of visibilities, which are obtained by measuring complex voltages between pairs of radio antennas. As part of this process, it is often necessary to build a model of the sky area observed with the interferometer, and to inverse Fourier-transform that sky model into a set of model visibilities.
In our case the sky model consists of a list of discrete components – each of them a delta or a 2D Gaussian function on the sky, and a polynomial function along the spectral axis. The model visibilities are generated through a slow but accurate Direct Fourier Transform (DFT). The accuracy of the DFT method is required for example in spectral-line interferometry, where a continuum sky model must be subtracted from the observed visibilities before making spectral-line images. |
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