A Search for Ultra-High Energy Gamma Rays from the Crab Pulsar, Hercules X-1, and Cygnus X-3

Details A Search for Ultra-High Energy Gamma Rays from the Crab Pulsar, Hercules X-1, and Cygnus X-3 A Search for Ultra-High Energy Gamma Rays from the Crab Pulsar, Hercules X-1, and Cygnus X-3

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........75c&link_type=abstract

Thesis (PH.D.)--THE UNIVERSITY OF MICHIGAN, 1991.Source: Dissertation Abstracts International, Volume: 52-03, Section: B, page:

Computer Science

1

Cosmic Rays

Scientific paper

The long-standing problem of discovering the origins of ultra-high energy (UHE: E >=q 1014 eV) cosmic rays could be solved if UHE gamma rays are found to be produced in sufficient quantities in certain types of celestial compact objects. This thesis involves a search for these energetic photons from the directions of three such objects using a ground-based particle detector situated in Dugway, Utah. The detector consists of two large arrays of plastic scintillators, one lying on the desert floor and covering an effective area of 3 times 10 ^4 m^2 and a second array buried 3 meters beneath the surface (1200 m ^2 of coverage). It is designed to discriminate air showers produced by primary hadronic cosmic rays from those produced by gamma rays on the basis of muon content. We find no evidence for UHE gamma rays from these three candidate point sources and set upper limits on the UHE gamma ray flux from each source direction at a level of ~2 times 10 14 cm^{ -2}s^{-1} using a data set taken over a two year interval. A search for short-term burst activity from each alleged source also shows no significant excess of showers, and we set flux limits from this analysis at ~4 times 10^{-11 } cm^{-2}s ^{-1} and ~ 1 times 10^ {-11} cm^{-2} s^{-1} (for 1.2 hr and 24 hr burst searches, respectively). The data are also checked for periodicity using variations of Fourier techniques in an effort to detect any possible time-varying signal; none is found.

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