Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..855s&link_type=abstract
GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 855-859 (2001).
Astronomy and Astrophysics
Astrophysics
X- And Gamma-Ray Telescopes And Instrumentation, Image Processing, Gamma-Ray
Scientific paper
The use of diffractive/refractive gamma-ray optics in the form of variants of the Fresnel lens offers the prospect of enormous advances in both sensitivity and angular resolution. Such lenses can concentrate gamma-ray flux from many square metres collecting area onto a small, low background, detector and can have imaging capability close to the diffraction limit, i.e. better than 1 micro arc second. In addition, they are simple in construction and robust. The drawback is that the focal lengths are extremely long (~106 km). However the mission requirements are more modest than those of other projects currently being planned. It is argued that there are no technological hurdles that would prevent the construction and use of telescopes based on these principles. The scientific objectives which could be achieved with such an instrument include direct imaging of the surroundings of supermassive black holes in AGN. .
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