MOIRCS deep survey. VI. : near-infrared spectroscopy of K-selected star-forming galaxies at z ~ 2.

摘要: We present the results of near-infrared multi-object spectroscopic observations for 37 BzK-color-selected star-forming galaxies conducted with MOIRCS on Subaru Telescope. The sample is drawn from Ks -band-selected catalog Deep Survey in GOODS-N region. About half our samples are selected publicly available 24 μm-source Multiband Imaging Photometer Spitzer board Space Hα emission lines detected 23 galaxies, which median redshift 2.12. derived star formation rates (SFRs) extinction-corrected luminosities. extinction correction estimated spectral energy distribution (SED) fitting multiband photometric data covering UV to wavelengths. Balmer decrement stacked shows that amount ionized gas larger than stellar continuum. From a comparison luminosity and other SFR indicators, we found relation between dust properties continuum different depending intrinsic (differential extinction). compared SFRs luminosities masses SED fitting. no correlation mass. Some mass smaller ~1010 M sun show higher ~100 yr-1. specific (SSFRs) these remarkably high; have SSFR ~10-8 yr-1 eight sample. best-fit parameters high-SSFR find average age population younger 100 Myr, consistent implied high SSFR. large implies possibility significantly contribute cosmic density universe at z ~ 2. When apply or differential correction, total Hα-emission-line 0.089-0.136 Mpc-3, densities literature. metallicity N2 index, expected mass-metallicity UV-selected 2 by Erb et al. This study based collected Telescope, operated National Astronomical Observatory Japan.