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In this analysis we illustrate how the relatively new emission mechanismknown as spinning dust can be used to characterize dust grains in theinterstellar medium. We demonstrate this by using spinning dust emissionobservations to constrain the abundance of very small dust grains (a $\lesssim$10nm) in a sample of Galactic cold cores. Using the physical properties of thecores in our sample as inputs to a spinning dust model, we predict the expectedlevel of emission at a wavelength of 1cm for four different very small dustgrain abundances, which we constrain by comparing to 1cm CARMA observations.For all of our cores we find a depletion of very small grains, which we suggestis due to the process of grain growth. This work represents the first time thatspinning dust emission has been used to constrain the physical properties ofinterstellar dust grains.

Using cm Observations to Constrain the Abundance of Very Small Dust Grains in Galactic Cold Cores