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    Pulsed TeV Gamma Rays detected from Hercules X-l during X-ray source eclipse

    Gorham, P.W. and Cawley, Michael F. and Fegan, D.J. and Gibbs, K.G. and Lamb, R.C. and Liebing, D.F. and Porter, N.A. and Stenger, V.J. and Weekes, T.C. (1986) Pulsed TeV Gamma Rays detected from Hercules X-l during X-ray source eclipse. Astrophysical Journal, 308. L11-L15. ISSN 0004-637X

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    Distinct 0.808-Hz pulsations were detected from Her X-1 in June 1985 using the atmospheric Cerenkov technique with the Whipple Observatory 10 m gamma-ray telescope, which had an effective gamma-ray energy threshold of about 600 GeV. The 2-hr observation spanned the transition into X-ray eclipse, at which the X-ray source Her X-1 is first occulted by the companion star HZ Herculis at orbital phase about 0.93 in the binary system. The pulsation persists for 1 hr or more after the beginning of the 6-hr eclipse, and it is concluded that the gamma-ray production site is in this case not coincident with the X-ray source.

    Item Type: Article
    Keywords: Electromagnetic Pulses; Gamma Ray Astronomy; Pulsars; Stellar Radiation; X Ray Binaries; Doppler Effect; Power Spectra; Time Series Analysis; Astrophysics; Gamma Rays: General; Pulsars; Stars: Individual Constellation Name: Hercules X-1; X-Rays: Binaries;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 12619
    Identification Number:
    Depositing User: Dr. Michael Cawley
    Date Deposited: 26 Mar 2020 15:51
    Journal or Publication Title: Astrophysical Journal
    Publisher: American Astronomical Society
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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