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We measure the two-point correlation function of G-dwarf stars within 1-3 kpcof the Sun in multiple lines-of-sight using the Schlesinger et al. G-dwarfsample from the SDSS SEGUE survey. The shapes of the correlation functionsalong individual SEGUE lines-of-sight depend sensitively on both thestellar-density gradients and the survey geometry. We fit smooth disk galaxymodels to our SEGUE clustering measurements, and obtain strong constraints onthe thin- and thick-disk components of the Milky Way. Specifically, weconstrain the values of the thin- and thick-disk scale heights with 3% and 2%precision, respectively, and the values of the thin- and thick-disk scalelengths with 20% and 8% precision, respectively. Moreover, we find that atwo-disk model is unable to fully explain our clustering measurements, whichexhibit an excess of clustering at small scales (< 50 pc). This suggests thepresence of small-scale substructure in the disk system of the Milky Way.

Probing Galactic Structure with the Spatial Correlation Function of SEGUE G-dwarf Stars