Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/6672
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dc.contributor.authorSurya, A-
dc.contributor.authorSaha, S. K-
dc.contributor.authorLabeyrie, A-
dc.date.accessioned2014-10-22T09:44:30Z-
dc.date.available2014-10-22T09:44:30Z-
dc.date.issued2014-09-01-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Vol. 443, No. 1, pp. 852-859en
dc.identifier.urihttp://hdl.handle.net/2248/6672-
dc.descriptionRestricted Accessen
dc.description.abstractOptical stellar interferometers have demonstrated milliarcsecond resolution with few apertures spaced hundreds of metres apart. To obtain rich direct images, many apertures will be needed, for a better sampling of the incoming wavefront. The coherent imaging thus achievable improves the sensitivity with respect to the incoherent combination of successive fringed exposures. Efficient use of highly diluted apertures for coherent imaging can be done with pupil densification, a technique also called ‘hypertelescope imaging’. Although best done with adaptive phasing, concentrating most energy in a dominant interference peak for a rich direct image of a complex source, such imaging is also possible with random phase errors such as caused by turbulent ‘seeing’, using methods such as speckle imaging which uses several short-exposure images to reconstruct the true image. We have simulated such observations using an aperture which changes through the night, as naturally happens on Earth with fixed grounded mirror elements, and find that reconstructed images of star clusters and extended objects are of high quality. As part of the study, we also estimated the required photon levels for achieving a good signal-to-noise ratio using such a technique.en
dc.language.isoenen
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen
dc.relation.urihttp://mnras.oxfordjournals.org/content/443/1/852en
dc.rights© Royal Astronomical Societyen
dc.subjectInstrumentation: high angular resolutionen
dc.subjectInstrumentation: interferometersen
dc.subjectTechniques: image processingen
dc.subjectTechniques: interferometricen
dc.titleSpeckle imaging with hypertelescopesen
dc.typeArticleen
Appears in Collections:IIAP Publications

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