Journal
ASTROPHYSICAL JOURNAL
Volume 904, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/abbd9d
Keywords
Radio interferometers; Very long baseline interferometers; Polarimetry
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Funding
- Perimeter Institute for Theoretical Physics
- Government of Canada through the Department of Innovation, Science and Economic Development Canada
- Province of Ontario through the Ministry of Economic Development, Job Creation and Trade
- Delaney Family John A. Wheeler Chair at Perimeter Institute
- Natural Sciences and Engineering Research Council of Canada
- Black Hole Initiative at Harvard University - John Templeton Foundation
- Gordon and Betty Moore Foundation to Harvard University
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Closure phases and closure amplitudes have proven critical to modern radio interferometry due to their insensitivity to the uncertain station gains. We present the first set of closure quantities constructed from parallel-hand and cross-hand visibilities that are insensitive to both station gains and to polarimetric leakage. These complex closure traces are a natural extension of closure amplitudes and closure phases, are independent of all station-based linear corruptions of the polarized visibilities, and are complete in the sense that they contain all remaining information present in the visibility data. Products of closure traces on so-called conjugate quadrangles are sensitive only to structure in the source polarization fraction-independent of variations in the Stokes I structure-and thereby provide unambiguous probes of polarization in astronomical sources.
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