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

Abstract

In this analysis we illustrate how the relatively new emission mechanism known as spinning dust can be used to characterize dust grains in the interstellar medium. We demonstrate this by using spinning dust emission observations to constrain the abundance of very small dust grains (a $\lesssim$ 10nm) in a sample of Galactic cold cores. Using the physical properties of the cores in our sample as inputs to a spinning dust model, we predict the expected level of emission at a wavelength of 1cm for four different very small dust grain 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 suggest is due to the process of grain growth. This work represents the first time that spinning dust emission has been used to constrain the physical properties of interstellar dust grains.

Accepted for publication in MNRAS

References in corpus (7)

• Cold Dark Clouds: The Initial Conditions for Star Formation
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• The evolution of amorphous hydrocarbons in the ISM: dust modelling from a new vantage point
• A refined model for spinning dust radiation
• Centimeter-wave continuum radiation from the rho Ophiuchi molecular cloud
• CBI limits on 31 GHz excess emission in southern HII regions
• New radio observations of anomalous microwave emission in the HII region RCW175

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• Dust Rotational Dynamics in C-shocks: Rotational Disruption of Nanoparticles by Stochastic Mechanical Torques and Spinning Dust Emission
• Resolved observations at 31 GHz of spinning dust emissivity variations in $\rho$ Oph
• Modelling the spinning dust emission from LDN 1780
• Thermal emission from the amorphous dust: An alternative possibility of the origin of the anomalous microwave emission
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