NASA NTRS · 19800060821
The X-ray superbubble in Cygnus
Abstract
It is shown that Cyg X-6 and Cyg X-7 are part of a large X-ray ring, 13 degrees in diameter. At a distance of 2 kpc, this X-ray source lies behind the Great Rift of Cygnus, and as such has radiation from its central region absorbed. The diameter of the emitting region is 450 pc. The X-ray source is associated with a ring of elongated H-alpha filaments which enclose the Cygnus X radio source. At the center of this region lies the highly luminous Cygnus OB2 association.
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Cash, W., Charles, P., Bowyer, S., Walter, F., Garmire, G., Riegler, G.. 1980-06-01. The X-ray superbubble in Cygnus. https://ntrs.nasa.gov/citations/19800060821
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