Arcsec source location measurements in gamma-ray astronomy from a lunar observatory

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Angular Resolution, Astronomical Observatories, Gamma Ray Astronomy, Lunar Based Equipment, Lunar Observatories, Spaceborne Astronomy, Astrometry, Astronomical Catalogs, Galactic Radiation, Spaceborne Telescopes, Moon, Utilization, Lunar Base, Physics, Astrophysics, Science Aspects, Gamma Rays, Source, Position (Location), Origin, Occultations, Design, Moon-Based Observations, Techniques, Astronomy, Equipment

Scientific paper

The physical processes typically used in the detection of high energy gamma-rays do not permit good angular resolution, which makes difficult the unambiguous association of discrete gamma-ray sources with objects emitting at other wavelengths. This problem can be overcome by placing gamma-ray detectors on the moon and using the horizon as an occulting edge to achieve arcsec resolution. For the purpose of discussion, this concept is examined for gamma rays above about 20 MeV for which pair production dominates the detection process and locally-generated nuclear gamma rays do not contribute to the background.

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