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SUMMARY:Faraday Tomography for the Square Kilometre Array - Anna Scaife (U
 niversity of Manchester)
DTSTART:20230130T161500Z
DTEND:20230130T170000Z
UID:TALK194506@talks.cam.ac.uk
DESCRIPTION:Image formation for radio interferometers such as the Square K
 ilometre Array (SKA) is an inverse problem\, subject to a number of compli
 cations\, both intrinsic to the measurement process and influenced by exte
 rnal factors. Beyond standard image formation\, the tomographic reconstruc
 tion of Faraday depth structure from incomplete spectral polarization meas
 urements with radio interferometers is an under-constrained problem requir
 ing additional regularisation. In this talk I will describe how Faraday de
 pth tomography can be used to reconstruct magnetic structures along the te
 lescope's line of sight and introduce a novel object-oriented compressed s
 ensing framework to reconstruct these data. Unlike previous compressed sen
 sing applications in this field\, this framework is designed to work direc
 tly with data that are irregularly sampled in wavelength-squared space and
  to incorporate multiple forms of compressed sensing regularisation. Furth
 ermore\, the framework is scalable to large data volumes such as those tha
 t will be produced by the SKA telescope and its precursors. I will also in
 troduce our methodology for identifying an optimal basis function for reco
 nstruction of these data\, using an approach that can be applied to datase
 ts from other telescopes and over different frequency ranges.
LOCATION:Seminar Room 1\, Newton Institute
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