Infrared dust emission from globular clusters

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Abstract
The implications of the presence of a central cloud in the cores of globular clusters were investigated recently (Angeletti, Capuzzo-Dolcetta & Giannone 1981a,b). A possible mechanism of confinement of dust in the central region of our cluster models was also explored (Angeletti, Capuzzo-Dolcetta & Giannone 1981c). The grain temperature and infrared emission have now been computed for rather realistic grain compositions. The grain components were assumed to be graphite and/or silicates. The central clouds turned out to be roughly isothermal. The wavelengths of maximum emission came out to be larger than 20 μm in all studied cases. An application of the theoretical results to five globular clusters showed that the predictable infrared emission for 47 Tuc, M4 and M22 should be detectable by means of present instrumentation aboard flying platforms.

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