Locating very high energy gamma-ray sources with arcminute accuracy

The angular accuracy of gamma-ray detectors is intrinsically limited by the physical processes involved in photon detection. Although a number of pointlike sources were detected by the COS B satellite, only two have been unambiguously identified by time signature with counterparts at longer waveleng...

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Veröffentlicht in:The Astrophysical journal 1991-08, Vol.377 (2), p.L97-L100
Hauptverfasser: Akerlof, C. W., Cawley, M. F., Chantell, M., Harris, K., Lawrence, M. A., Fegan, D. J., Lang, M. J., Hillas, A. M., Jennings, D. G., Lamb, R. C.
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container_end_page L100
container_issue 2
container_start_page L97
container_title The Astrophysical journal
container_volume 377
creator Akerlof, C. W.
Cawley, M. F.
Chantell, M.
Harris, K.
Lawrence, M. A.
Fegan, D. J.
Lang, M. J.
Hillas, A. M.
Jennings, D. G.
Lamb, R. C.
description The angular accuracy of gamma-ray detectors is intrinsically limited by the physical processes involved in photon detection. Although a number of pointlike sources were detected by the COS B satellite, only two have been unambiguously identified by time signature with counterparts at longer wavelengths. By taking advantage of the extended longitudinal structure of VHE gamma-ray showers, measurements in the TeV energy range can pinpoint source coordinates to arcminute accuracy. This has now been demonstrated with new data analysis procedures applied to observations of the Crab Nebula using Cherenkov air shower imaging techniques. With two telescopes in coincidence, the individual event circular probable error will be 0.13 deg. The half-cone angle of the field of view is effectively 1 deg.
doi_str_mv 10.1086/186125
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subjects Astronomical and space-research instrumentation
Astronomy
Earth, ocean, space
Exact sciences and technology
Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations
title Locating very high energy gamma-ray sources with arcminute accuracy
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