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Stacking of large interferometric data sets in the image- and uv-domain - a comparative study

Lukas Lindroos (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Kirsten Kraiberg Knudsen (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; John Conway (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Ivan Marti-Vidal (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium)
Monthly notices of the Royal Astronomical Society (0035-8711). Vol. 446 (2015), 4, p. 3502-3515.
[Artikel, refereegranskad vetenskaplig]

We present a new algorithm for stacking radio interferometric data in the uv-domain. The performance of uv-stacking is compared to the stacking of fully imaged data using simulated Atacama Large Millimeter/submillimeter Array and the Karl G. Jansky Very Large Array (VLA) deep extragalactic surveys. We find that image-and uv-stacking produce similar results, however, uv-stacking is typically the more robust method. An advantage of the uv-stacking algorithm is the availability of uv-data post-stacking, which makes it possible to identify and remove problematic baselines. For deep VLA surveys uv-stacking yields a signal-to-noise ratio that is up to 20 per cent higher than image-stacking. Furthermore, we have investigated stacking of resolved sources with a simulated VLA data set where 1.5 arcsec (10-12 kpc at z similar to 1-4) sources are stacked. We find that uv-stacking, where a model is fitted directly to the visibilities, significantly improves the accuracy and robustness of the size estimates. While scientific motivation for this work is studying faint, high-z galaxies, the algorithm analysed here would also be applicable in other fields of astronomy. Stacking of radio interferometric data is also expected to play a big role for future surveys with telescopes such as Low-Frequency Array and Square Kilometre Array.

Nyckelord: Deep Field-South, Lyman-Break Galaxies, Vla-Cosmos Survey, 1.4 Ghz, Submillimeter Properties, Radio-Emission, Star-Formation, Data Release, Alma Survey



Denna post skapades 2015-05-18. Senast ändrad 2015-11-13.
CPL Pubid: 217181

 

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