High-Resolution HI Absorption Survey of the Central 200 pc

Cornelia C. Lang, Claudia Cyganowski, W.M. Goss, Sung Kim, Jun-Hui Zhao

1 University of Iowa
2 National Radio Astronomy Observatory
3 National Radio Astronomy Observatory
4 Harvard-Smithsonian Center for Astrophysics
5 Harvard-Smithsonian Center for Astrophysics

E-mail contact: clang@astro.umass.edu

We have made an HI mosaic of the central 200 pc of the Galaxy using an angular resolution of 15'' (0.6 pc at the Galactic center) and a velocity resolution of 2.5 km s-1. This study provides, for the first time, high enough angular resolution HI data to compare with the many high resolution observations which have been made of Galactic center sources over the past ten years. Information on the velocities, relative distances of sources and HI column densities will be presented. Such data serves to clarify the nature of physical associations between the unique radio continuum features in this region and the atomic and molecular components. In particular, we are interested in the arrangement of sources in the active Radio Arc region: the atomic, ionized and molecular gas in addition to massive stellar clusters and magnetic filaments.