ASPCS
 
Back to Volume
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.
Back to Volume