Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981prir........33i&link_type=abstract
Priroda, Dec. 1981, p. 33-36. In Russian.
Astronomy and Astrophysics
Astronomy
Galactic Structure, High Temperature Gases, Interstellar Gas, Milky Way Galaxy, X Ray Sources, Gas Density, Gas Ionization, Gas Temperature, Heao 1, Internal Energy, Shock Fronts, Stellar Mass Ejection, Supernovae
Scientific paper
The Cygnus Superbubble, an unusually extended (13 x 18 deg) diffuse soft X-ray source discovered by HEAO-1, is discussed. The source, at a distance of 6000 light years with a diameter on the order of the thickness of the galactic disk, consists of fully ionized interstellar gas at a temperature of 2,000,000 K, density of 0.01/cu cm, and internal energy of 10 to the 52 erg. Previous optical and radioastronomical observations support the presence of a large volume of hot, diffuse gas in the region, associated with filaments characteristic of a shock front propagating in the interstellar medium, and a powerful OB 2 association near the center of the bubble. It has been proposed that the superbubble represents the winds from successive supernova explosions occurring as a chain reaction, and observations of similar structures in the solar neighborhood indicate the potential importance of such phenomena to star formation in the interstellar medium.
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