We present average stellar population properties and dark matter halo masses
of z∼2 \lya emitters (LAEs) from SED fitting and clustering analysis,
respectively, using ≃1250 objects (NB387≤25.5) in four separate
fields of ≃1 deg2 in total. With an average stellar mass of 10.2±1.8×108M⊙ and star formation rate of 3.4±0.4M⊙yr−1, the LAEs lie on an extrapolation
of the star-formation main sequence (MS) to low stellar mass. Their effective
dark matter halo mass is estimated to be $4.0_{-2.9}^{+5.1} \times 10^{10}\
{\mathrm M_\odot}withaneffectivebiasof1.22^{+0.16}_{-0.18}whichislowerthanthatofz \sim 2LAEs(1.8\, \pm\, 0.3),obtainedbyapreviousstudybasedonathreetimessmallersurveyarea,withaprobabilityof96\%.
However, the difference in the bias values can be explained if cosmic variance
is taken into account. If such a low halo mass implies a low HI gas mass, this
result appears to be consistent with the observations of a high \lya escape
fraction. With the low halo masses and ongoing star formation, our LAEs have a
relatively high stellar-to-halo mass ratio (SHMR) and a high efficiency of
converting baryons into stars. The extended Press-Schechter formalism predicts
that at z=0ourLAEsaretypicallyembeddedinhaloswithmassessimilartothatoftheLargeMagellanicCloud(LMC);theywillalsohavesimilarSHMRstotheLMC,iftheirSFRsarelargelysuppressedafterz \sim 2$ as some previous
studies have reported for the LMC itself.Comment: 34 pages, 15 figures, 6 tables. Accepted for publication in PAS