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[en] Classically, optical and near-infrared interferometry have relied on closure phase techniques to produce images. Such techniques allow us to achieve modest dynamic ranges. In order to test the feasibility of next generation optical interferometers in the context of the VLTI-spectro-imager (VSI), we have embarked on a study of image reconstruction and analysis. Our main aim was to test the influence of the number of telescopes, observing nights and distribution of the visibility points on the quality of the reconstructed images. Our results show that observations using six Auxiliary Telescopes (ATs) during one complete night yield the best results in general and is critical in most science cases; the number of telescopes is the determining factor in the image reconstruction outcome. In terms of imaging capabilities, an optical, six telescope VLTI-type configuration and ~200 meter baseline will achieve 4 mas spatial resolution, which is comparable to ALMA and almost 50 times better than JWST will achieve at 2.2 microns. Our results show that such an instrument will be capable of imaging, with unprecedented detail, a plethora of sources, ranging from complex stellar surfaces to microlensing events.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Filho, Mercedes E; Ctr. de Astrofisica, Univ. do Porto (Portugal)
Renard, Stephanie; Observatoire de Lyon (France)
Garcia, Paulo; Ctr. de Astrofisica, Univ. do Porto (Portugal) and Univ. do Porto (Portugal)
Duvert, Gilles; Lab. d'Astrophysique de Grenoble, Observatoire de Grenoble (France)
Duchene, Gaspard; Univ. of California, Berkeley (United States)
Thiebaut, Eric; Observatoire de Lyon (France)
Young, John; Cavendish Lab. (United Kingdom)
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Berger, Jean-Phillipe; Univ. Joseph Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)
Beckert, Thomas; Max-Planck Institute for Radioastronomy (Germany)
Hoenig, Sebastian; Max-Planck Institute for Radioastronomy (Germany)
Schertl, Dieter; Max-Planck Institute for Radioastronomy (Germany)
Weigelt, Gerd; Max-Planck Institute for Radioastronomy (Germany)
Testi, Leonardo; INAF, Osservatorio di Astrofisica di Arcetri (Italy)
Tatuli, Eric; INAF, Osservatorio di Astrofisica di Arcetri (Italy)
Borkowski, Virginie ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
De Becker, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Aringer, Bernard; Institute of Astrophysics, Univ. of Wien (Austria)
Hron, Joseph; Institute of Astrophysics, Univ. of Wien (Austria)
Lebzelter, Thomas; Institute of Astrophysics, Univ. of Wien (Austria)
Chiavassa, Andrea; Groupe de Recherche en Astronomie et Astrophysique du Languedoc (France)
Corradi, Romano; Groupe de Recherche en Astronomie et Astrophysique du Languedoc (France)
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