A High-resolution Polarimetric Survey of the Central 200 pc of the Galaxy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present a 4.9 GHz continuum survey of the central 200 pc of the Galaxy. The Very Large Array (VLA) was used to obtain 90 pointings toward the central degree of the Galaxy in its D-array configuration. The multi-scale CLEAN algorithm was used in AIPS++ to construct a full-Stokes mosaic with a resolution of 25". This is the first large-scale, high-sensitivity mosaic of polarized intensity made toward the Galactic Center (GC) and our primary goal is to search for low-brightness large-scale polarized features which may be associated with the 50-100 known non-thermal filaments (NTFs) which populate this unique region. The survey data will also be used to study the diffuse radio emission in conjunction with Spitzer and new Chandra X-ray observations of the central 200 pc of the GC and also to begin to idenfity the point source distribution in the Galactic center. Follow-up C-array observations with the VLA of this region are underway to improve the spatial resolution to 10", which will enhance our sensitivity to point-like features.

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