SIMBAD references

We present results from a near-infrared narrow-band survey of emission-line galaxies at z = 2.23, using the Wide Field Camera on the United Kingdom Infrared Telescope. The H₂S1 narrow-band filter (λ_c= 2.121µm) we employ selects the Hα emission-line redshifted to z = 2.23, and is thus suitable for selecting `typical' star-forming galaxies and active galactic nuclei at this epoch. The pilot study was undertaken in the well-studied Cosmological Evolution Survey field (COSMOS) and is already the largest near-infrared narrow-band survey at this depth, with a line flux limit of F_Hα∼ 10^–16erg/s/cm2 over 0.60deg2, probing ∼220x10³Mpc3 (comoving) down to a limiting star formation rate of ∼30M_☉/yr (3σ). In this paper, we present the results from our pilot survey and evaluate the Hα luminosity function and estimate the clustering properties of Hα emitters at z = 2.23 from 55 detected galaxies. The integrated luminosity function is used to estimate the volume-averaged star formation rate at z = 2.23: ρ_SFR= 0.17^+0.16_–0.09M_☉/yr/Mpc3 for L_Hα> 10⁴²erg/s. For the first time, we use the Hα star formation tracer to reliably constrain ρ_SFR out to z = 2.23 demonstrating the rapid increase in ρ_SFR out to this redshift as well as confirming the flattening in ρ_SFR between z ∼ 1 and 2. In addition to the luminosity distribution, we analyse the clustering properties of these galaxies. Using the two-point angular correlation function, ω(θ), we estimate a real-space correlation length of r₀= 4.2^+0.4_–0.2h^–1Mpc. In comparison to models of clustering which take into account bias evolution, we estimate that these galaxies are hosted by dark matter haloes of mass M_halo∼ 10¹²M_☉ consistent with the progenitors of the Milky Way.