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We have used the Goddard IRAM 2-Millimeter Observer (GISMO) with the 30 mIRAM telescope to carry out a 2 mm survey of the Galaxy's central molecularzone (CMZ). These observations detect thermal emission from cold ISM dust,thermal free-free emission from ionized gas, and nonthermal synchrotronemission from relatively flat-spectrum sources. Archival data sets spanning$3.6 \mu$m to 90 cm are used to distinguish different emission mechanisms.After the thermal emission of dust is modeled and subtracted, the remaining 2mm emission is dominated by free-free emission, with the exception of thebrightest nonthermal filament (NTF) that runs though the middle of the bundleof filaments known as the Radio Arc. This is the shortest wavelength at whichany NTF has been detected. The GISMO observations clearly trace this NTF over alength of ~0.2$^\circ$, with a mean 2 mm spectral index which is steeper thanat longer wavelengths. The 2 mm to 6 cm (or 20 cm) spectral index steepens from$\alpha \approx -0.2$ to $-0.7$ as a function distance from the Sickle H IIregion, suggesting that this region is directly related to the NTF. A number ofunresolved (at $21''$) 2 mm sources are found nearby. One appears to be thermaldust emission from a molecular cloud that is associated with an enigmatic radiopoint source whose connection to the Radio Arc is still debated. The morphologyand colors at shorter IR wavelengths indicate other 2 mm unresolved sources arelikely to be compact H II regions.

2 mm GISMO Observations of the Galactic Center. II. A Nonthermal Filament in the Radio Arc and Compact Sources