Possible detection of π^0^-decay γ-ray emission from CYG OB2 by EGRET.

Details Possible detection of π^0^-decay γ-ray emission from CYG OB2 by EGRET. Possible detection of π^0^-decay γ-ray emission from CYG OB2 by EGRET.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.423c&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.423-426

Astronomy and Astrophysics

Astrophysics

10

(Stars:) Circumstellar Matter, Stars: Individual: Cyg X-3, Gamma Rays: Observations, Gamma Rays: Theory, Associations: Ass Cyg Ob 2

Scientific paper

We report possible detection of π^0^-decay radiation from Cyg OB2, a nearby (1.7kpc) massive OB star association. The EGRET flux (>100MeV) 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.

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