Search for point sources of ultrahigh energy γ rays in the southern hemisphere with the South Pole Air Shower Experiment

Details Search for point sources of ultrahigh energy γ rays in the southern hemisphere with the South Pole Air Shower Experiment Search for point sources of ultrahigh energy γ rays in the southern hemisphere with the South Pole Air Shower Experiment

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvd..48.4504v&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 48, Issue 10, 15 November 1993, pp.4504-4517

Physics

9

Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray

Scientific paper

We report on the results of a search for point sources of ultrahigh energy γ radiation in data collected in 1988, 1990, and 1991 by the South Pole Air Shower Experiment. Nine predefined point sources were investigated: the x-ray binaries SMC X-1, LMC X-4, Cen X-3, Vela X-1, 4U1626-67, 4U1145-61, the supernova 1987A, the globular cluster 47 Tucanae, and the unconfirmed source BL-1. No conclusive evidence was found for dc emission from any of the nine candidates. An all sky search for a time-averaged signal was performed, but no significant excess was found. We find a 95% C.L. flux limit of 2.0×10-13 cm-2s-1 above 50 TeV for all sources, with the exception of Vela X-1 where we have set the limit at 0.6×10-13 cm-2s-1 above 200 TeV. The four x-ray binaries SMC X-1, LMC X-4, Cen X-3, and Vela X-1 were investigated for γ-ray emission modulated with the orbital period. No evidence for a modulated γ-ray signal was found. A search for sporadic emission from the nine sources was conducted on time scales of one hour, one day, and one week. The hourly and weekly burst searches were unsuccessful, but a statistically significant excess from SMC X-1 (99.6% C.L.) was detected during one day in 1991: 178 events on-source versus 120 background events. If this excess is attributed to a γ-ray signal, the associated flux above 50 TeV is (1.3+/-0.2)×10-11 cm-2s-1.

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