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Proceedings Paper

ELTS, interferometers, and hypertelescopes at different wavelengths
Author(s): Antoine Labeyrie
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Paper Abstract

In the way of major new instruments for ground-based optical astronomy, maximizing the science favors a large hypertelescope. If equipped with adaptive optics and a laser guide star, it can provide direct high-resolution images of faint extra-galactic and cosmological sources. The signal/(photon noise) ratio is theoretically higher than with interferometer schemes relying upon aperture synthesis, using a few large apertures to reconstruct images. The crowding limit on complex objects, the direct-imaging field, and the dynamic range are also improved with many small apertures. The adaptive phasing of hypertelescopes, achievable on bright stars with modified wave sensing techniques such as "dispersed speckle" analysis, is also achievable on very faint sources with a modified version of a laser guide star. This makes large hypertelescopes capable of observing cosmological deep fields of faint galaxies. Pending space versions, the size of which can in principle reach hundreds and thousands of kilometers, terrestrial hypertelescopes limited in size to one or two kilometers can be built at suitable sites and used efficiently from ultra-violet to millimeter wavelengths. Some sites can allow the coupling of a hypertelescope with an ELT, an alternate option which can also be efficient for imaging deep fields with a high-resolution.

Paper Details

Date Published: 22 April 2008
PDF: 12 pages
Proc. SPIE 6986, Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg, 69860C (22 April 2008); doi: 10.1117/12.801263
Show Author Affiliations
Antoine Labeyrie, Collège de France & Observatoire de la Côte d'Azur (France)


Published in SPIE Proceedings Vol. 6986:
Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg

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