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HI Absorption Measurements over the Galactic Centre Radio Arc and Arches Regions

Published online by Cambridge University Press:  23 September 2016

J. Lasenby ,
A. N. Lasenby  and
F. Yusef-Zadeh
J. Lasenby
Affiliation:
Mullard Radio Astronomy Observatory, Cambridge, UK
A. N. Lasenby
Affiliation:
Mullard Radio Astronomy Observatory, Cambridge, UK
F. Yusef-Zadeh
Affiliation:
Mullard Radio Astronomy Observatory, Cambridge, UK

Abstract

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An HI absorption study of the central ~ 100 pc of the galactic centre was performed using the compact array of the VLA2. The results of these observations lead us to believe that the body of gas at 40–50 km s−1, known as the ‘40 km s−1 molecular cloud’, is placed behind the Arc. In addition, the distribution of gas around +20km s−1 across the Arc and its correlation with 3cm polarized emission suggests that it may be this 20km s−1 gas which is associated with the Arc and is depolarizing much of its synchrotron radiation. The kinematic structure of the negative velocity HI gas across the arched filaments implies an association between the neutral atomic gas and the ionized and molecular material.

Type
The Arc
Information
Symposium - International Astronomical Union , Volume 136: The Galactic Center , 1989 , pp. 293 - 300
Copyright
Copyright © Kluwer 1989 

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