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Gas Feeding Toward the Central Neutral Ring in the Galactic Center

Published online by Cambridge University Press:  23 September 2016

P. T. P. Ho ,
J. M. Jackson ,
J. T. Armstrong  and
J. C. Szczepanski
P. T. P. Ho
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA
J. M. Jackson
Affiliation:
University of California, Berkeley, CA
J. T. Armstrong
Affiliation:
Universität zu Köln, Köln, FRG
J. C. Szczepanski
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA Massachusetts Institute of Technology, Cambridge, MA

Abstract

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VLA observations in the (J, K)=(3,3) line of ammonia reveal new structures in the Galactic center region. An approximate ring of emission is centered on the central ionized streamers. This ring, seen previously in millimeter-wave interferometer maps, is very clumpy in the ammonia emission, with size scales ≲10″ (0.4 pc). The clumps show good spatial and velocity agreement with the ionized gas, and are warm with brightness temperatures exceeding 30 K. A comparison of the (3,3) to (1,1) ratio indicates considerably higher gas temperatures. This circumnuclear ring may not be the dominant feature in the mass distribution of the circumnuclear gas. A streamer, immediately to the south of the Galactic center, connects the gas complex at lII= −4′ (~10 pc) directly to the Galactic center. This streamer may define the path for gas flow into the nuclear region.

Type
The Environment of the SGR A Complex
Information
Symposium - International Astronomical Union , Volume 136: The Galactic Center , 1989 , pp. 379 - 382
Copyright
Copyright © Kluwer 1989 

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