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Gas Feeding Toward the Central Neutral Ring in the Galactic Center

  • P. T. P. Ho (a1), J. M. Jackson (a2), J. T. Armstrong (a3) and J. C. Szczepanski (a1) (a4)

Abstract

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.

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References

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Gas Feeding Toward the Central Neutral Ring in the Galactic Center

  • P. T. P. Ho (a1), J. M. Jackson (a2), J. T. Armstrong (a3) and J. C. Szczepanski (a1) (a4)

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