Spatial and kinematic structure of the thermal components of the Galactic center arc

Physics

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Scientific paper

High-resolution radio continuum and radio recombination line observations of two bright segments of the filamentary Arc near the galactic center have been carried out using the VLA. On the basis of the polarization and recombination line characteristics of these regions, one can clearly identify and distinguish the thermal and non-thermal features of the Arc. These observations provide strong evidence in support of a physical interaction between these two components. In fact, the clarity of the interaction between thermal and non-thermal structures in unprecedented. In the regions of interaction, the magnetic field is dynamically important, and we infer that its strength exceeds 1 milligauss.
The dominant components of thermal emission are centered on G0.18-0.04 and G0.1+0.08, which are integral parts of the Arc, but appear to be physically coupled to two distinct molecular clouds-the 50 and -30 km/s clouds. A complex and highly organized flow of ionized gas is seen in both sources. We consider several possibilities for the source of ionization in G0.18-0.04.

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