Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980s%26t....59..455c&link_type=abstract
Sky and Telescope, vol. 59, June 1980, p. 455-461.
Astronomy and Astrophysics
Astronomy
Cygnus Constellation, Heao 1, Stellar Spectra, Stellar Structure, X Ray Sources, Bubbles, H Alpha Line, Interstellar Matter, Low Temperature Environments, Radio Astronomy, Satellite-Borne Instruments
Scientific paper
The discovery of the superbubble in the constellation Cygnus, a hot gas cloud more than 1,000 light years in diameter, by the techniques of space-borne astronomy is discussed. The region was first discovered as a low-temperature, extended ring-shaped X-ray source in Cygnus by the A2 instrument of HEAO 1. Radio and optical observations of the region reveal that the Great Rift of Cygnus cuts the X-ray ring where it is broken and presumably obscures the center of a giant sphere of X-ray emission; it is also aligned with H alpha filaments, the Cygnus OB2 association, the radio source Cygnus X and a radio supershell. The over 10 to the 52nd ergs of thermal energy estimated to be contained within the superbubble is attributed to the effects of supernova winds from O stars formed by the collapse of dust in the Great Rift. Other potential superbubbles in the Galaxy are the Gum nebula and the Orion-Eridanus hot-spot-Barnard's Loop-Horsehead and Orion nebula association. If, as is indicated by present observations, 10% of the volume of the Galaxy is enclosed in superbubbles, then they would emerge by virtue of their great energy as the basic dynamical unit of the interstellar medium.
Cash Webster
Charles Phil
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