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158μm [CII] Mapping of the Galactic Center Molecular Clouds

Published online by Cambridge University Press:  23 September 2016

R. Genzel ,
G. J. Stacey ,
C. H. Townes ,
A. Poglitsch  and
N. Geis
R. Genzel
Affiliation:
Max-Planck-Inst. for Extraterrestrial Physics, Garching FRG
G. J. Stacey
Affiliation:
Dept. of Physics, University of California, Berkeley, CA USA
C. H. Townes
Affiliation:
Dept. of Physics, University of California, Berkeley, CA USA
A. Poglitsch
Affiliation:
Max-Planck-Inst. for Extraterrestrial Physics, Garching FRG
N. Geis
Affiliation:
Max-Planck-Inst. for Extraterrestrial Physics, Garching FRG

Abstract

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We have made 55″ resolution maps of the 158 μm [CII] emission line in the region of the curved, thermal filaments and the +20 / +50 kms−1 molecular clouds in Sgr A. The [CII] emission is spatially well correlated with the radio continuum in the filaments. The large intensity of the [CII] radiation excludes shocks as the origin of the ionization and we conclude that the curved filaments are most likely photo-ionized HII regions at the surface of dense molecular clouds. Our [CII] maps of the +20 / +50 kms−1 clouds indicate that the +50 kms−1 cloud is close to (<10pc) Sgr A west while the more massive +20 kms−1 cloud is at a greater distance from the center (>30pc).

Type
The Large - Scale Interstellar Medium
Information
Symposium - International Astronomical Union , Volume 136: The Galactic Center , 1989 , pp. 151 - 155
Copyright
Copyright © Kluwer 1989 

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