Reference : Phase referencing in optical interferometry
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/10143
Phase referencing in optical interferometry
English
Filho, Mercedes E [Ctr. de Astrofisica, Univ. do Porto (Portugal)]
Garcia, Paulo [Ctr. de Astrofisica, Univ. do Porto (Portugal) and Univ. do Porto (Portugal)]
Duvert, Gilles [Lab. d'Astrophysique, 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 mailto [Université de Liège - ULg > 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 - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
De Becker, Michaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
Surdej, Jean mailto [Université de Liège - ULg > 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 [Astrophysique du Languedoc (France)]
Corradi, Romano [Astrophysique du Languedoc (France)]
Harries, Tim [Univ. of Exeter (United Kingdom)]
1-Jul-2008
Optical and Infrared Interferometry
Schöller, Markus
Danchi, William
Delplancke, Françoise
SPIE
Proceedings of the SPIE, volume 7013
7013
1F.1-1F.12
No
No
International
Bellingham
WA, USA
Space Telescopes and Instrumentation 2008: Optical and Infrared Interferometry
23/06/2008 - 28/06/2008
SPIE
Marseille
France
[en] Interferometry
[en] One of the aims of next generation optical interferometric instrumentation is to be able to make use of information contained in the visibility phase to construct high dynamic range images. Radio and optical interferometry are at the two extremes of phase corruption by the atmosphere. While in radio it is possible to obtain calibrated phases for the science objects, in the optical this is currently not possible. Instead, optical interferometry has relied on closure phase techniques to produce images. Such techniques allow only to achieve modest dynamic ranges. However, with high contrast objects, for faint targets or when structure detail is needed, phase referencing techniques as used in radio interferometry, should theoretically achieve higher dynamic ranges for the same number of telescopes. Our approach is not to provide evidence either for or against the hypothesis that phase referenced imaging gives better dynamic range than closure phase imaging. Instead we wish to explore the potential of this technique for future optical interferometry and also because image reconstruction in the optical using phase referencing techniques has only been performed with limited success. We have generated simulated, noisy, complex visibility data, analogous to the signal produced in radio interferometers, using the VLTI as a template. We proceeded with image reconstruction using the radio image reconstruction algorithms contained in aips imagr (clean algorithm). Our results show that image reconstruction is successful in most of our science cases, yielding images with a 4 milliarcsecond resolution in K band. We have also investigated the number of target candidates for optical phase referencing. Using the 2MASS point source catalog, we show that there are several hundred objects with phase reference sources less than 30 arcseconds away, allowing to apply this technique.
Researchers ; Professionals
http://hdl.handle.net/2268/10143
10.1117/12.787908
http://de.arxiv.org/abs/0810.0545
http://adsabs.harvard.edu/abs/2008SPIE.7013E..40F
Copyright 2008 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

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