Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345..305b&link_type=abstract
In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 305-310 (SEE N85-15539 06-90)
Astronomy and Astrophysics
Astronomy
2
Bubbles, Clumps, Interstellar Matter, Ring Structures, Spiral Galaxies, Stellar Composition, Taylor Instability, Astronomical Models, Local Group (Astronomy), Solar Radio Emission, X Ray Astronomy
Scientific paper
Bubbles which are very common structure units in the Galaxy and galaxies were examined. Collection of radio, optical, infrared and X-ray observations of the Cyg superbubble (CSB) region of the sky show that the CSB is not a single bubble object. Between 50 to 75 percent of its X-ray emission is ascribed to discrete sources. The other 25 to 50% X-ray emission, probably originates from bubbles around 8 OB associations of the region. All bubbles located within the spiral structure of Galaxy, M31 and M33 have diameter 300 pc. The large distance of stellar association from the galactic plane (GP) combined with picture of the gas distribution within the LSA shows that a Reyleigh-Taylor instability in the LSA can develop and give use to the formation of compact stellar clusters, such as the Cyg OB2 association. Development stages of the Reyleigh-Taylor instability, some peculiarities of the dust distribution and departures of the local structure from the galactic grand design suggest the absence of a spiral shockwave in the LSA.
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