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Possible Detection of Pi(exp 0)-Decay Gamma-Ray Emission from Cyg OB2 by EGRETWe report possible detection of pi (exp 0) decay radiation from Cyg OB2, a nearby (1.7 kpc) massive OB star association. The EGRET flux (greater than 100 MeV) maps clearly indicate a point source whose error circle includes both Cyg OB2 and Cyg X-3. We show that Cyg X-3 is unlikely to be the counterpart for the EGRET source, because of the marginal spatial consistency and the lack of the 4.8 hour modulation seen in other high energy emissions from Cyg X-3. If confirmed, this will be the first detection by EGRET of massive stars.
Document ID
20000050369
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Chen, W.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
White, R. L.
(Space Telescope Science Inst. Baltimore, MD United States)
Bertsch, D.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 19, 2013
Publication Date
December 3, 1996
Publication Information
Publication: Astronomy and Astrophysics Supplement Series
Publisher: European Southern Observatory
Volume: 120
Subject Category
Space Radiation
Distribution Limits
Public
Copyright
Other

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