Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt.........4z&link_type=abstract
PhD Dissertation, Purdue Univ. West Lafayette, IN United States
Astronomy and Astrophysics
Astronomy
Gamma Rays, Point Sources, Pulsars, Crab Nebula, Cosmic Ray Showers, Cerenkov Radiation, Cerenkov Counters, Gamma Ray Astronomy, Emission Spectra, Data Reduction, Estimating, Frequencies, Gamma Ray Observatory, Continuous Radiation, Pulsed Radiation
Scientific paper
The Haleakala Gamma Ray Observatory, a fast-timing air shower detector utilizing the Atmospheric Cerenkov Technique to search for High Energy Gamma Rays from point sources, observed the Crab Pulsar-Nebula for approximately 240 hours from August, 1989 through January 1991. This data has been analyzed for long-term and burst steady-state (DC) emission, and for both continuous and sporadic pulsed emission at the 33 ms frequency of the Crab pulsar, both prior to and after data selection. It was discovered that half of the data should be rejected as a result of systematic problems on one of the two instruments. The remaining data comprised two operating modes, one of which was less sensitive to ambient light and had greater sensitivity to air showers than the other. After allowing for effects due to possible accidental triggers, analysis yielded a 6.4 alpha excess of continuous nonpulsed emission for the instrument when operated in the more sensitive mode. The steady-state flux is estimated to be Flux approximately equal to (2.5 +/- 0.4) x 10-10 gamma/sq cm/s above 300 GeV. This flux is a factor of approximately 2 greater than that expected using the spectrum above 400 GeV obtained by the Whipple collaboration. DC analysis after data reduction failed to improve the signal to background, as was predicted by simulations. No conclusive evidence for emission at the Crab pulsar frequency was found in this data set.
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