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In this paper we study the stellar-mass dependence of galaxy clustering inthe 6dF Galaxy Survey. The near-infrared selection of 6dFGS allows morereliable stellar mass estimates compared to optical bands used in other galaxysurveys. Using the Halo Occupation Distribution (HOD) model, we investigate thetrend of dark matter halo mass and satellite fraction with stellar mass bymeasuring the projected correlation function, $w_p(r_p)$. We find that thetypical halo mass ($M_1$) as well as the satellite power law index ($\alpha$)increase with stellar mass. This indicates, (1) that galaxies with higherstellar mass sit in more massive dark matter halos and (2) that these moremassive dark matter halos accumulate satellites faster with growing masscompared to halos occupied by low stellar mass galaxies. Furthermore we find arelation between $M_1$ and the minimum dark matter halo mass ($M_{\rm min}$) of$M_1 \approx 22\,M_{\rm min}$, in agreement with similar findings for SDSSgalaxies. The satellite fraction of 6dFGS galaxies declines with increasingstellar mass from 21% at $M_{\rm stellar} = 2.6\times10^{10}h^{-2}\,M_{\odot}$to 12% at $M_{\rm stellar} = 5.4\times10^{10}h^{-2}\,M_{\odot}$ indicating thathigh stellar mass galaxies are more likely to be central galaxies. We compareour results to two different semi-analytic models derived from the MillenniumSimulation, finding some disagreement. Our results can be used for placing newconstraints on semi-analytic models in the future, particularly the behaviourof luminous red satellites. Finally we compare our results to studies of halooccupation using galaxy-galaxy weak lensing. We find good overall agreement,representing a valuable crosscheck for these two different tools of studyingthe matter distribution in the Universe.

The 6dF Galaxy Survey: Dependence of halo occupation on stellar mass