Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Toward a diffraction-limited square-kilometer optical telescope: Digital revival of intensity interferometry - art. no. 698609

In English

Författare

Summary, in English

Much of the progress in astronomy follows imaging with improved resolution. In observing stars, current capabilities are only marginal in beginning to image the disks of a few, although many stars will appear as surface objects for baselines of hundreds of meters. Since atmospheric turbulence makes ground-based phase interferometry challenging for such long baselines, kilometric space telescope clusters have been proposed for imaging stellar surface details. The realization of such projects remains uncertain, but comparable imaging could be realized by ground-based intensity interferometry. While insensitive to atmospheric turbulence and imperfections in telescope optics, the method requires large flux collectors, such as being set up as arrays of atmospheric Cherenkov telescopes for studying energetic gamma rays. High-speed detectors and digital signal handling enable very many baselines to be synthesized between pairs of telescopes, while stars may be tracked across the sky by electronic time delays. First observations with digitally combined optical instruments have now been made with pairs of 12-meter telescopes of the VERITAS array in Arizona. Observing at short wavelengths adds no problems, and similar techniques on an extremely large telescope could achieve diffraction-limited imaging down to the atmospheric cutoff, achieving a spatial resolution significantly superior by that feasible by adaptive optics operating in the red or near-infrared.

Publiceringsår

2008

Språk

Engelska

Sidor

98609-98609

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

  • stellar surface imaging
  • astronomical intensity interferometry
  • air Cherenkov telescopes
  • quantum optics

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: 1996-756X
  • ISSN: 0277-786X