The Stellar Mass, Star Formation Rate and Dark Matter Halo Properties of LAEs at $z\sim 2$

Abstract

We present average stellar population properties and dark matter halo masses of $z\sim 2$ \lya emitters (LAEs) from SED fitting and clustering analysis, respectively, using $\simeq$ $1250$ objects ($NB387\le 25.5$) in four separate fields of $\simeq 1$ deg${}^2$ in total. With an average stellar mass of $10.2\pm 1.8\times 10^8{\mathrm{M}}_{\odot }$ and star formation rate of $3.4\pm 0.4{\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$, 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 $4.0_{-2.9}^{+5.1}\times 10^{10}{\mathrm{M}}_{\odot }$ with an effective bias of $1.22_{-0.18}^{+0.16}$ which is lower than that of $z\sim 2$ LAEs ($1.8\pm 0.3$), obtained by a previous study based on a three times smaller survey area, with a probability of $96\%$. 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 $z=0$ our LAEs are typically embedded in halos with masses similar to that of the Large Magellanic Cloud (LMC); they will also have similar SHMRs to the LMC, if their SFRs are largely suppressed after $z\sim 2$ as some previous studies have reported for the LMC itself.

arXiv comment34 pages, 15 figures, 6 tables. Accepted for publication in PASJ

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