Abstract
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−1molecular cloud’, is placedbehindthe Arc. In addition, the distribution of gas around +20km s−1across the Arc and its correlation with 3cm polarized emission suggests that it may be this 20km s−1gas 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.
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