ELTs, adaptive optics and wavelengths - art. no. 698608
Författare
Summary, in English
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-wave length goal of 1 000 nm for first light AO with later updates reaching down to visual wavelengths.
Avdelning/ar
Publiceringsår
2008
Språk
Engelska
Sidor
98608-98608
Publikation/Tidskrift/Serie
Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg
Volym
6986
Dokumenttyp
Konferensbidrag
Förlag
SPIE
Ämne
- Astronomy, Astrophysics and Cosmology
Nyckelord
- wavelength range
- Extremely Large Telescopes
- adaptive optics
- point-spread function
- spatial resolution
- collection
- photon
- photometry
Conference name
Retirement Symposium for Arne Ardeberg on Extremely Large Telescopes - Which Wavelengths
Conference date
2007-11-29 - 2007-11-30
Conference place
Lund, Sweden
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0277-786X
- ISSN: 1996-756X