Evidence for long-term variability in the ultra high energy photon flux from Cygnus X-3

Details Evidence for long-term variability in the ultra high energy photon flux from Cygnus X-3 Evidence for long-term variability in the ultra high energy photon flux from Cygnus X-3

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1...83b&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 83-86 (SEE N85-33902 22-93)

Computer Science

Cerenkov Radiation, Cosmic Ray Showers, Gamma Ray Beams, Luminosity, Muons, Photomultiplier Tubes, Photon Beams, Time Dependence, Wide Angle Lenses, Cygnus Constellation, Galactic Cosmic Rays, Interstellar Radiation, Stellar Radiation, X Ray Binaries

Scientific paper

A time-correlation analysis of atmospheric Cerenkov pulses by a wide-angle photomultiplier system was previously shown to have present in it a nonrandom component which seemed associated with the Right Ascension (RA) range approx. 20+or-04h. A recent examination of multi-muon events recorded by a photon-decay detector shows a similar time-dependent effect, closely matching the previous results, supporting the suggestion that the effect is of cosmic origin. However, even though Cyg. X-3 lies well inside the region of peak intensity, it does not seem possible to ascribe to it the whole effect, for the implied photon flux appears too large to be reconciled to various gamma-ray measurements of Cyg. X-3. The original data were subjected to a phase-histogram analysis and it as found that only 2.5% of overall recorded data are compatible with a phase-dependent emission from Cyg. X-3. Assuming these events to be gamma rays yields a detected flux of (2.6 + or - 0.3) x 10 to the minus 12th power gamma cm -2s-1 above 5 x 10 to the 14th power eV. Comparing this value with more recent ultra high energy (UHE) photon data from the same source, it is suggested that the available data generally favor a long-term reduction in the Cyg. X-3 inferred luminosity ( 10 to the 13th power eV) by a factor of (1.8 + or - 0.3) per year.

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