Episodic emission from Hercules X-1 at energies greater than 10 to the 14th eV - Observations with Ooty extensive air shower array during 1986

Details Episodic emission from Hercules X-1 at energies greater than 10 to the 14th eV - Observations with Ooty extensive air shower array during 1986 Episodic emission from Hercules X-1 at energies greater than 10 to the 14th eV - Observations with Ooty extensive air shower array during 1986

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354l..13g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 354, May 1, 1990, p. L13-L16.

Other

16

Radiation Detectors, Stellar Radiation, Variable Stars, X Ray Binaries, Cosmic Ray Showers, Eclipsing Binary Stars, Flux (Rate), Galactic Cosmic Rays, India, Periodic Variations, Stellar Luminosity

Scientific paper

The results of the observation of four well-separated episodes of pulsed emission from Hercules X-1 at PeV energies, at a highly precise period, using data collected at Ooty, are summarized. The episodes from four days with higher than average observed shower rates show evidence for flux pulsed with the same smaller period of 1.2357701 s, which is fully consistent with other observations during 1986. A search for correlation between these episodes with a period precise enough to phase-lock the signal from Her X-1 has confirmed them to be related. The episodic flux is estimated to be at energies greater than 10 to the 14 eV. The 1.7 d orbital phases for showers observed in Ooty episodes show clustering near phase of 0.65, and these episodes have all occurred near phase of 0.65 during the LOW ON state of the 35 d cycle. These observations establish conclusively Hercules X-1 to be an episodic source at PeV energies.

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