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We observed radio continuum emission in 27 local (D < 70 Mpc) star-forminggalaxies with the Robert C. Byrd Green Bank Telescope between 26 GHz and 40 GHzusing the Caltech Continuum Backend. We obtained detections for 22 of thesegalaxies at all four sub-bands and four more marginal detections by taking theaverage flux across the entire bandwidth. This is the first detection (full ormarginal) at these frequencies for 22 of these galaxies. We fit spectral energydistributions (SEDs) for all of the four-sub-band detections. For 14 of thegalaxies, SEDs were best fit by a combination of thermal free-free andnonthermal synchrotron components. Eight galaxies with four-sub-band detectionshad steep spectra that were only fit by a single nonthermal component. Usingthese fits, we calculated supernova rates, total number of equivalent O stars,and star formation rates within each ~23 arcsecond beam. For unresolvedgalaxies, these physical properties characterize the galaxies' recent starformation on a global scale. We confirm that the radio-far-infrared correlationholds for the unresolved galaxies' total 33 GHz flux regardless of theirthermal fractions, though the scatter on this correlation is larger than thatat 1.4 GHz. In addition, we found that for the unresolved galaxies, there is aninverse relationship between the ratio of 33 GHz flux to total far-infraredflux and the steepness of the galaxy's spectral index between 1.4 GHz and 33GHz. This relationship could be an indicator of the timescale of the observedepisode of star formation.

Radio continuum observations of local star-forming galaxies using the Caltech Continuum Backend on the Green Bank Telescope