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.

Optical intensity interferometry with the Cherenkov Telescope Array

In English

Författare

Summary, in English

With its unprecedented light-collecting area for night-sky observations, the Cherenkov Telescope Array (CTA) holds great potential for also optical stellar astronomy, in particular as a multi-element intensity interferometer for realizing imaging with sub-milliarcsecond angular resolution. Such an order-of-magnitude increase of the spatial resolution achieved in optical astronomy will reveal the surfaces of rotationally flattened stars with structures in their circumstellar disks and winds, or the gas flows between close binaries. Image reconstruction is feasible from the second-order coherence of light, measured as the temporal correlations of arrival times between photons recorded in different telescopes. This technique (once pioneered by Hanbury Brown and Twiss) connects telescopes only with electronic signals and is practically insensitive to atmospheric turbulence and to imperfections in telescope optics. Detector and telescope requirements are very similar to those for imaging air Cherenkov observatories, the main difference being the signal processing (calculating cross correlations between single camera pixels in pairs of telescopes). Observations of brighter stars are not limited by sky brightness, permitting efficient CTA use during also bright-Moon periods. While other concepts have been proposed to realize kilometer-scale optical interferometers of conventional amplitude (phase-) type, both in space and on the ground, their complexity places them much further into the future than CTA, which thus could become the first kilometer-scale optical imager in astronomy. (C) 2012 Elsevier B.V. All rights reserved.

Publiceringsår

2013

Språk

Engelska

Sidor

331-347

Publikation/Tidskrift/Serie

Astroparticle Physics

Volym

43

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • Cherenkov telescopes
  • Intensity interferometry
  • Hanbury Brown-Twiss
  • Optical interferometry
  • Stars: individual
  • Photon statistics

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1873-2852