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Large-Scale Bubble Structure of the Interstellar Medium (ISM) and Properties of the Local Spiral Arm (LSA)

Published online by Cambridge University Press:  12 April 2016

Nikolay G. Bochkarev
Nikolay G. Bochkarev*
Affiliation:
Sternberg State Astronomical Institute, Moscow, USSR

Abstract

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Bubbles are very common structure units in the Galaxy and galaxies. 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 can be 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 ≲ 300pc.

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 steller 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.

Type
Theoretical Models
Information
International Astronomical Union Colloquium , Volume 81: Local Interstellar Medium , 1984 , pp. 305 - 310
Copyright
Copyright © NASA 1984

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