Pulsed TeV gamma rays detected from Hercules X-1 during X-ray source eclipse

Details Pulsed TeV gamma rays detected from Hercules X-1 during X-ray source eclipse Pulsed TeV gamma rays detected from Hercules X-1 during X-ray source eclipse

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308l..11g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 308, Sept. 1, 1986, p. L11-L15. DOE-supported resea

Astronomy and Astrophysics

Astronomy

29

Electromagnetic Pulses, Gamma Ray Astronomy, Pulsars, Stellar Radiation, X Ray Binaries, Doppler Effect, Power Spectra, Time Series Analysis

Scientific paper

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.

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