Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.289..568d&link_type=abstract
Nature, vol. 289, Feb. 12, 1981, p. 568, 569. Research supported by the National Board for Science and Technology of Ireland and
Astronomy and Astrophysics
Astronomy
62
Gamma Ray Astronomy, X Ray Sources, Cerenkov Counters, Field Of View, Histograms, Photomultiplier Tubes, Radiation Detectors
Scientific paper
These observations qualitatively confirm the observation of gamma rays from the X-ray source Cyg X-3 by the Crimean Observatory group. Observations were made in drift scans lasting 30 minutes each: 10 minutes before the source entered the field (OFF), 10 minutes in the field (ON), and a final 10 minutes outside the field (OFF). The ratios of ON/OFF rates are close to unity except at the phase interval from 0.7 to 0.8, which has a 3.5 sigma deviation from unity. It is noted that the phase of the peak corresponds to the maximum emission for lower energy gamma rays and for X-rays.
Danaher S.
Fegan David J.
Porter Neil A.
Weekes Trevor C.
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