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The Violent Interstellar Medium in Messier 31

Published online by Cambridge University Press:  12 April 2016

Elias Brinks ,
Robert Braun  and
Stephen W. Unger
Elias Brinks
Affiliation:
Royal Greenwich Observatory, Herstmonceux Castle, Hailsham BN27 1RP, England
Robert Braun
Affiliation:
National Radio Astronomy Observatory, Very Large Array, Socorro, New Mexico 87801-0387, U.S.A.
Stephen W. Unger
Affiliation:
Royal Greenwich Observatory, Herstmonceux Castle, Hailsham BN27 1RP, England

Abstract:

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TAURUS observations in the line of Hα and VLA HI mapping of the HII complex No. 722 in M31, reveal what seems to be a spherical cavity 330 pc in diameter blown out by a stellar association of over 20 × 106 year old. Evidence of induced star formation which was initiated less than 5 × 106 years ago is present in the form of bright HII emission and numerous O, B and Wolf-Rayet stars which are found within the shell surrounding the cavity. The energy necessary to create the HI shell is estimated to be about 5 × 1051 erg.

Type
VII. The Structure of the Interstellar Medium
Information
International Astronomical Union Colloquium , Volume 120: Structure and Dynamics of the Interstellar Medium , 1989 , pp. 524 - 529
Copyright
Copyright © Springer-Verlag 1989

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