Anomalous periodicity in the very high energy gamma-ray sources

Details Anomalous periodicity in the very high energy gamma-ray sources Anomalous periodicity in the very high energy gamma-ray sources

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342.1129s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 1129-1133.

Astronomy and Astrophysics

Astronomy

18

Gamma Ray Astronomy, Pulsars, X Ray Binaries, Accretion Disks, Kepler Laws, Neutron Stars, Stellar Magnetospheres, Stellar Mass Accretion, Stellar Orbits

Scientific paper

Evidence for anomalous periodicity in TeV gamma-rays that is about 0.1 percent shorter than the X-ray period, has been observed from Her X-1. It is suggested that such periodicity may result from the interaction of a broad particle beam with target matter removed from the accretion disk by instabilities at the disk/magnetosphere interface. Such target matter will initially travel in a Keplerian orbit about the pulsar. Very high energy gamma-rays are observed only when the target matter is between the neutron star and the observer. As such, the gamma-rays are observed to be pulsed at the period of the Keplerian orbit.

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