TeV gamma rays from Hercules X-1 pulsed at an anomalous frequency

Details TeV gamma rays from Hercules X-1 pulsed at an anomalous frequency TeV gamma rays from Hercules X-1 pulsed at an anomalous frequency

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328l..13l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 328, May 1, 1988, p. L13-L16. Research supported by the Smithsoni

Astronomy and Astrophysics

Astronomy

60

Binary Stars, Gamma Ray Astronomy, Light Curve, Power Spectra, Pulsars, X Ray Sources, Cerenkov Radiation, Ephemeris Time, Fourier Analysis, Frequency Shift

Scientific paper

Hercules X-1 was tracked for 67 hr in 1986 May-June by the Whipple Observatory 10 m gamma-ray telescope. One 25 minute episode of apparent pulsed emission was detected at primary photon energies above 0.6 TeV. The observed pulsation frequency is anomalous in that it is (0.16 + or - 0.02) percent higher than that associated with the neutron star's spin. The overall significance of the effect is such that it is about 1 percent likely to be spurious.

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