... We also demonstrate that for a source having a Gaussian surface brightness profile, a single longbaseline estimate of refractive substructure determines an absolute minimum brightness temperature, if the scattering properties along a given line of sight are known, and that this minimum accurately approximates the apparent brightness temperature over a wide range of total flux densities. ... At 18 cm, the brightness temperature estimate after accounting for refractive noise is Tb ~ 7 ґ 1012 K . ...
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