We present measurements of three-dimensional correlation functions of
like-sign low transverse momentum kaon pairs from sqrt(sNN)=200 GeV Au+Au
collisions. A Cartesian surface-spherical harmonic decomposition technique was
used to extract the kaon source function. The latter was found to have a
three-dimensional Gaussian shape and can be adequately reproduced by
Therminator event generator simulations with resonance contributions taken into
account. Compared to the pion one, the kaon source function is generally
narrower and does not have the long tail along the pair transverse momentum
direction. The kaon Gaussian radii display a monotonic decrease with increasing
transverse mass m_T over the interval of 0.55<=m_T<=1.15 GeV/c^2. While the
kaon radii are adequately described by the m_T-scaling in the outward and
sideward directions, in the longitudinal direction the lowest m_T value exceeds
the expectations from a pure hydrodynamical model prediction.
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