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A 200 pc Ring of Molecular Gas and an Outburst in the Galaxy M82

Published online by Cambridge University Press:  04 August 2017

N. Nakai ,
M. Hayashi ,
T. Hasegawa ,
Y. Sofue ,
T. Handa  and
M. Sasaki
N. Nakai
Affiliation:
Nobeyama Radio Observatory, University of Tokyo, Japan
M. Hayashi
Affiliation:
Nobeyama Radio Observatory, University of Tokyo, Japan Department of Astronomy, University of Tokyo, Japan
T. Hasegawa
Affiliation:
Nobeyama Radio Observatory, University of Tokyo, Japan
Y. Sofue
Affiliation:
Nobeyama Radio Observatory, University of Tokyo, Japan
T. Handa
Affiliation:
Nobeyama Radio Observatory, University of Tokyo, Japan Department of Astronomy, University of Tokyo, Japan
M. Sasaki
Affiliation:
Department of Astronomy, University of Kyoto, Japan

Abstract

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The CO (J=1-0) emission in M82 has been mapped with the Nobeyama 45-m telescope. The CO intensity distribution in the central region is resolved into two peaks. An axisymmetric model reveals a ring structure of molecular gas at a distance of 80-400 pc (centered near 200 pc) from the nucleus. This “200-pc ring” corresponds to just the region of a star formation burst. The molecular gas in M82 is also expanding out of the galactic plane with a velocity of 100-500 km s−1. The expansion energy of (0.1-1.4) x 1056 erg can be explained by the energy supply of supernovae in the central region.

Type
II. Large Scale Processes of Star Formation
Information
Symposium - International Astronomical Union , Volume 115: Star Forming Regions , 1987 , pp. 614 - 620
Copyright
Copyright © Reidel 1987 

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