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Search for TeV gamma-ray emission from Hercules X-1
Reynolds, P. T.; Cawley, M. F.; Fegan, D. J.; Hillas, A. M.; Kwok, P. W.; Lamb, R. C.; Lang, M. J.; Lewis, D. A.; Macomb, D. J.; O'Flaherty, K. S.; Vacanti, G.; Weekes, T. C.
AA(Iowa State University of Science and Technology, Ames; Whipple Observatory, Amado, AZ), AB(St. Patrick's College, Maynooth, Republic of Ireland), AC(University College, Dublin, Republic of Ireland), AD(University College, Dublin, Republic of Ireland), AE(University College, Dublin, Republic of Ireland), AF(Leeds, University, England), AG(NASA, Goddard Space Flight Center, Greenbelt, MD; Whipple Observatory, Amado, AZ; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AH(Iowa State University of Science and Technology, Ames), AI(Iowa State University of Science and Technology, Ames), AJ(Iowa State University of Science and Technology, Ames; Computer Sciences Corp., Baltimore, MD)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Dec. 1, 1991, p. 640-646. Research supported by DOE, Smithsonian Scholarly Studies Research Fund, and Irish Science and Technology Agency. (ApJ Homepage)
Publication Date:
Space Radiation
NASA/STI Keywords:
Eclipsing Binary Stars, Gamma Ray Spectra, Pulsars, X Ray Stars, Astronomical Observatories, Emission Spectra, Power Spectra
Bibliographic Code:


Six years of observations of Hercules X-1 with the Whipple Observatory gamma-ray telescope have been subjected to a Fourier analysis to search for emission at the 0.8079 Hz neutron star frequency. Evidence for a signal is found at the 99.5 percent confidence level for data taken with the medium-resolution imaging camera with some indications of emission at frequencies blueshifted from the fundamental frequency. However, analysis of the high-resolution camera data base have failed to substantiate this effect. Selection of events on the basis of gamma-ray-like image parameters did not enhance the signal from the medium-resolution data nor produce any indication of a signal from the high-resolution data. The overall conclusion is that no statistically significant evidence for TeV gamma-ray emission was found in the Whipple Observatory data base when the 6 years of data are taken as a whole.

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