Software Holography: Interferometric Data Analysis for the Challenges of Next Generation Observatories - AstrophysicsReport as inadecuate




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Abstract: Next generation radio observatories such as the MWA, LWA, LOFAR, CARMA andSKA provide a number of challenges for interferometric data analysis. Thesechallenges include heterogeneous arrays, direction-dependent instrumental gain,and refractive and scintillating atmospheric conditions. From the analysisperspective, this means that calibration solutions can not be described using asingle complex gain per antenna. In this paper we use the optimal map-makingformalism developed for CMB analyses to extend traditional interferometricradio analysis techniques-removing the assumption of a single complex gain perantenna and allowing more complete descriptions of the instrumental andatmospheric conditions. Due to the similarity with holographic mapping of radioantenna surfaces, we call this extended analysis approach software holography.The resulting analysis algorithms are computationally efficient, unbiased, andoptimally sensitive. We show how software holography can be used to solve someof the challenges of next generation observations, and how more familiaranalysis techniques can be derived as limiting cases.



Author: Miguel F. Morales, Michael Matejek

Source: https://arxiv.org/







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