The ViSta method for optimized stacking of broadband interferometric data in the Fourier domain
Abstract
We present the optimized version of ViSta, a visibility-domain stacking method that combines interferometric observations in the Fourier domain from radio to sub-millimeter wavelengths. By stacking visibilities directly and transforming them into the rest frame, ViSta enhances the signal, suppresses noise, and improves image reconstruction through extended uv-coverage. ViSta outperforms image stacking when individual sources are too faint to detect, achieving higher SNR in the low-signal and extended regime. This new optimized version features a C++/OpenMP kernel which replaces CASA demanding functions, enabling GPU acceleration while minimising memory usage and intermediate data products. The method is highly flexible, allowing stacking regardless of array configuration, spectral setup, or telescope. In the SKA era, where visibilities will not be routinely preserved, ViSta helps in assessing the information lost in the image-plane transition and in exploiting the vast amount of data still stored in interferometric archives.
Versions
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BibTeX
@misc{torsello2026vista,
title = {{The ViSta method for optimized stacking of broadband interferometric data in the Fourier domain}},
author = {Martina Torsello and Marcella Massardi and Elisabetta Liuzzo and Gayathri Gururajan and Francesca Perrotta and Andrea Lapi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01897},
eprint = {2609.01897},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01897},
}
RIS
TY - UNPB
TI - The ViSta method for optimized stacking of broadband interferometric data in the Fourier domain
AU - Martina Torsello
AU - Marcella Massardi
AU - Elisabetta Liuzzo
AU - Gayathri Gururajan
AU - Francesca Perrotta
AU - Andrea Lapi
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01897
UR - https://arxiv.org/abs/2609.01897
AB - We present the optimized version of ViSta, a visibility-domain stacking method that combines interferometric observations in the Fourier domain from radio to sub-millimeter wavelengths. By stacking visibilities directly and transforming them into the rest frame, ViSta enhances the signal, suppresses noise, and improves image reconstruction through extended uv-coverage. ViSta outperforms image stacking when individual sources are too faint to detect, achieving higher SNR in the low-signal and extended regime. This new optimized version features a C++/OpenMP kernel which replaces CASA demanding functions, enabling GPU acceleration while minimising memory usage and intermediate data products. The method is highly flexible, allowing stacking regardless of array configuration, spectral setup, or telescope. In the SKA era, where visibilities will not be routinely preserved, ViSta helps in assessing the information lost in the image-plane transition and in exploiting the vast amount of data still stored in interferometric archives.
ER -