Speaker
Description
From a survey of 24 star-forming regions made using the Green Bank 100m telescope with the C-band receiver in full Stokes mode, we have discovered two sources of 4.765 GHz exOH masers that display circular polarisation. Linear polarisation has previously been found in flaring 4.765 GHz exOH masers in Mon R2 IRS 3, but this is the first time that circular polarisation has been found in these masers. The separation between the RCP and LCP modes is very small. If we assume the splitting of the components is due to the Zeeman effect and that the profiles are Gaussian, we show how the V/I plot can be used to determine a value for the splitting. The Lande g-value for this transition is poorly known so we can only set rough limits on the strength of the magnetic field causing the Zeeman splitting in the circular components.
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