Observations of steady flux of PeV-energy extensive air showers from Cygnus X-3 during 1984-1986

Tonwar, S. C. ; Gopalakrishnan, N. V. ; Rajeev, M. R. ; Sreekantan, B. V. (1988) Observations of steady flux of PeV-energy extensive air showers from Cygnus X-3 during 1984-1986 The Astrophysical Journal, 330 . L107-L111. ISSN 0004-637X

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Official URL: http://adsabs.harvard.edu/doi/10.1086/185215

Related URL: http://dx.doi.org/10.1086/185215


Data taken with a 24 detector extensive air shower array, operating at Ooty since 1984 June, have been used to search for excess of extensive air showers of energy > 2.5 × 1014 eV from the direction of binary X-ray source Cyg X-3. The data show a time-averaged excess in the number of showers from this direction, over the background determined from other regions of the sky having the same declination. The excess is most prominent among older showers having a flatter lateral distribution. A part of this excess shows up significantly in the phase region, 0.6-0.8 in the 4.8 hr periodicity analysis. These observations correspond to an integral flux of (7.16 ± 3.15) × 10-13 cm -2 s-1 at energies > 2.5 × 1014 eV and of (1.04 ± 0.44) × 10-13 cm-2 s-1 at energies > 2.5 × 1015 eV. The observations confirm, for the first time, results reported by the Kiel group in 1983 of a directional excess from the direction of Cygnus X-3, without requiring the 4.8 hr periodicity analysis as was necessary in many of the other experiments reporting positive signals. This emphasizes the advantage of good angular resolution for such studies.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
Keywords:Cosmic Ray Showers; Gamma Rays; Neutron Stars; Particle Flux Density; X Ray Binaries; Angular Resolution; Electron Emission; Electron Energy; Histograms; Light Curve; Relativistic Particles
ID Code:50007
Deposited On:21 Jul 2011 09:02
Last Modified:21 Jul 2011 09:02

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