Observation of γ rays >1015 eV from Cygnus X-3 View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1983-10

AUTHORS

J. Lloyd-Evans, R. N. Coy, A. Lambert, J. Lapikens, M. Patel, R. J. O. Reid, A. A. Watson

ABSTRACT

The X-ray binary system Cygnus X-3 is a source of particular interest. As well as emitting X rays which are modulated with a 4.8-h period, it has been observed in 30–100 MeV γ rays by the SAS II satellite1 and several groups have detected γ rays in the TeV range showing the same 4.8-h period2–5. Additionally there is evidence of a 34.1-day period2,6,7 and of random variations correlated with X-ray emission and radio outbursts8,9. Most recently, Samorski and Stamm10, using the small extensive air shower array at Kiel, have found that the γ-ray spectrum of Cygnus X-3 extends above 2×1015 eV, with an integral flux of (7.4±3.2)×10−14 cm−2 s−1. This result has considerable implications both for our understanding of the source and for the solution of the long-standing problem of the origin of cosmic rays. We now confirm the Kiel observations and present evidence that the γ-ray spectrum of Cygnus X-3 steepens above 1016 eV. More... »

PAGES

784-787

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/305784a0

DOI

http://dx.doi.org/10.1038/305784a0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1004687390


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