TOPICAL REVIEW: ?/hadron separation at TeV energies

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During the past decade, significant advances have been made in TeV 0954-3899/23/9/004/img2-ray astronomy arising mainly from development of the imaging atmospheric Cerenkov technique (IACT). This topical review summarizes instrumental and analytical advances which have made possible the rejection of the background hadronic showers with an efficiency close to 100%, while simultaneously rejecting no more than 50% of genuine 0954-3899/23/9/004/img2-ray showers. Application of large optical reflectors to the detection and registration of shower images is described, together with image formation and mapping of Cerenkov photons using high-resolution imaging focal plane detectors. An overview is presented of how images are processed and parametrized, prior to 0954-3899/23/9/004/img2/hadron separation. In the context of rejection strategies, the deleterious muon background is also discussed. The gradual evolution of a number of dedicated 0954-3899/23/9/004/img2/hadron separation strategies is summarized from the standpoint of both single and multiple telescope operation. The review concludes with an overview of astrophysical accomplishments to date, based on successful application of proven 0954-3899/23/9/004/img2/hadron separation strategies. Potential future trends are discussed.

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