A new approach for short-spacing correction of radio interferometric data sets

Abstract

The short-spacing problem describes the inherent inability of radio-interferometric arrays to measure the integrated flux and structure of diffuse emission associated with extended sources. New interferometric arrays, such as SKA, require solutions to efficiently combine interferometer and single-dish data. We present a new and open source approach for merging single-dish and cleaned interferometric data sets requiring a minimum of data manipulation while offering a rigid flux determination and full high angular resolution. Our approach combines single-dish and cleaned interferometric data in the image domain. This approach is tested for both Galactic and extragalactic HI data sets. Furthermore, a quantitative comparison of our results to commonly used methods is provided. Additionally, for the interferometric data sets of NGC4214 and NGC5055, we study the impact of different imaging parameters as well as their influence on the combination for NGC4214. The approach does not require the raw data (visibilities) or any additional special information such as antenna patterns. This is advantageous especially in the light of upcoming radio surveys with heterogeneous antenna designs.

arXiv comment15 pages, accepted for publication by Astronomical Notes

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Cited by in corpus (7)

• GASKAP-HI Pilot Survey Science I: ASKAP Zoom Observations of HI Emission in the Small Magellanic Cloud
• Data Combination: Interferometry and Single-dish Imaging in Radio Astronomy
• Mapping the merging zone of late infall in the AB Aur planet-forming system
• Total Power Map to Visibilities (TP2VIS): Joint Deconvolution of ALMA 12m, 7m, and Total Power Array Data
• AzTEC Survey of the Central Molecular Zone: Data Reduction, Analysis, and Preliminary Results
• AzTEC Survey of the Central Molecular Zone: Increasing Spectral Index of Dust with Density
• ALMA Observations of W Hya: Impact of missing baselines