Polarization of scattered light in globular clusters

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Globular Clusters, Light Scattering, Optical Polarization, Rayleigh Scattering, Astronomical Models, Galactic Clusters, Optical Thickness, Polarization Characteristics

Scientific paper

It is shown by a simple model that the polarization of light scattered from Rayleigh scatterers such as dust particles, in patches in globular clusters, should under certain circumstances be observable. A search for such polarization of radiation from the dark patches in M3, M13 and M15 led to a tentative detection of the phenomenon in M15, at a value of 0.22% + or - 0.06%. The model calculations examine scattering by a small, optically thin cloud of dust embedded in a spherically symmetric cluster, in that plane perpendicular to the line of sight which contains the cluster center.

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