Galactic kU-band Thermal Survey (GUTS)

This White Paper proposes a unique milli-Jansky sensitive arcsecond resolution VLA 15 GHz (Ku band) continuum polarization imaging survey of the Galactic plane using C array configuration. The science driver is to fill the gap between previous lower frequency VLA Galactic plane surveys, mainly detecting synchrotron radio emission at 1.4 and 5 GHz, and the higher frequency (future ALMA and present MSX, SPITZER, PLANCK, WISE) 0.1-100 THz infrared surveys that detect thermal radiation. The 15 GHz band appears to be the highest frequency at which such a survey is both feasible and maximally unique from the synchrotron radio view and will facilitate new multi-waveband Galactic research and, for example, identify targets for ALMA. Depending on the final survey parameters, for example a 3 second integration time for a (8-sigma) 1 mJy 12-18 GHz detection limit over a 10 degree band along the VLA observable (280 degree) Galactic plane, this survey would consume up to 3200 VLA observing hours using on-the-fly mapping and still allow for, e.g., an additional sub-Jy sensitive 12.2 GHz methanol maser line survey. Furthermore this survey would reveal potential compact high-frequency VLA calibrators in the Galactic bulge and plane, a region where there is a severe lack of them.

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