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Proceedings Paper

ELTs, adaptive optics, and wavelengths
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Paper Abstract

A number of Extremely Large Telescopes for visual-infrared and adjacent wavelengths are in various degrees of progress. All have primary mirrors with equivalent diameters larger than 20 m and are intended for operation with adaptive optics systems. We discuss several ELT observing parameters as functions of wavelength. Stellar energy distributions and atomic line spectra are inspected as are the transmission of the Earth's atmosphere, the emissivity of the sky and telescope and instruments as well as detector sensitivity, resolution and signal-to-noise ratio. The spatial resolution depending on the size of the diffraction limited adaptive optics point spread function is discussed. We have evaluated the ELT efficiency in terms of Johnson V to N band photometry, simulating diffraction-limited ELT images of a stellar field at 4 Mpc and 4 kpc, respectively. We conclude that the information content at shorter wavelengths is of dominant nature and that there is every reason to do the utmost to include shorter wavelengths in the AO regime. We propose to adopt a short-wavelength goal of 1 000 nm for first light AO with later updates reaching down to visual wavelengths.

Paper Details

Date Published: 22 April 2008
PDF: 13 pages
Proc. SPIE 6986, Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg, 698608 (22 April 2008); doi: 10.1117/12.801259
Show Author Affiliations
Arne Ardeberg, Lund Observatory (Sweden)
Peter Linde, Lund Observatory (Sweden)


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

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