期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 505, 期 2, 页码 2328-2335出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab1424
关键词
instrumentation: high angular resolution; instrumentation: interferometers; telescopes; stars: imaging
资金
- CNRS Institute des Sciences de l'Univers
- French National Research Agency [ANR20-CE31-0003]
- Region PACA
- UCA, Nice, France.
In this study, a new approach is proposed to transform a Cherenkov telescope into the equivalent of an optical telescope, achieving diffraction limited imaging of celestial sources in visible light. By borrowing photonics components from quantum-optical applications, spatial details of observed sources can be recovered, despite the Cherenkov telescope's poor optical quality compared to extremely large optical telescopes.
We propose a new approach, based on the Hanbury Brown and Twiss intensity interferometry, to transform a Cherenkov telescope to its equivalent optical telescope. We show that, based on the use of photonics components borrowed from quantum-optical applications, we can recover spatial details of the observed source down to the diffraction limit of the Cherenkov telescope, set by its diameter at the mean wavelength of observation. For this, we propose to apply aperture synthesis techniques from pairwise and triple correlation of sub-pupil intensities, in order to reconstruct the image of a celestial source from its Fourier moduli and phase information, despite atmospheric turbulence. We examine the sensitivity of the method, i.e. limiting magnitude, and its implementation on existing or future high energy arrays of Cherenkov telescopes. We show that despite its poor optical quality compared to extremely large optical telescopes under construction, a Cherenkov telescope can provide diffraction limited imaging of celestial sources, in particular at the visible, down to violet wavelengths.
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