We report on the small scale ( 0.5 < r < 40 h ^ { -1 } \mathrm { Mpc } ) clustering of 78895 massive ( M _ { * } \sim 10 ^ { 11.3 } M _ { \odot } ) galaxies at 0.2 < z < 0.4 from the first two years of data from the Baryon Oscillation Spectroscopic Survey ( BOSS ) , to be released as part of SDSS Data Release 9 ( DR9 ) .
We describe the sample selection , basic properties of the galaxies , and caveats for working with the data .
We calculate the real- and redshift-space two-point correlation functions of these galaxies , fit these measurements using Halo Occupation Distribution ( HOD ) modeling within dark matter cosmological simulations , and estimate the errors using mock catalogs .
These galaxies lie in massive halos , with a mean halo mass of 5.2 \times 10 ^ { 13 } h ^ { -1 } M _ { \odot } , a large scale bias of \sim 2.0 , and a satellite fraction of 12 \pm 2 \% .
Thus , these galaxies occupy halos with average masses in between those of the higher redshift BOSS CMASS sample and the original SDSS I/II LRG sample .