Chemical Abundances of DEEP2 Star-forming Galaxies at 1.0<z<1.5

Abstract

We present the results of near-infrared spectroscopic observations for a sample of 12 star-forming galaxies at 1.0<z<1.5, drawn from the DEEP2 Galaxy Redshift Survey. H-beta, [OIII], H-alpha, and [NII] emission-line fluxes are measured for these galaxies. Application of the O3N2 and N2 strong-line abundance indicators implies average gas-phase oxygen abundances of 50-80% solar. We find preliminary evidence of luminosity-metallicity (L-Z) and mass-metallicity (M-Z) relationships within our sample, which spans from M_B=-20.3 to -23.1 in rest-frame optical luminosity, and from 4x10^9 to 2x10^11 Msun in stellar mass. At fixed oxygen abundance, these relationships are displaced from the local ones by several magnitudes towards brighter absolute B-band luminosity and more than an order of magnitude towards larger stellar mass. If individual DEEP2 galaxies in our sample follow the observed global evolution in the B-band luminosity function of blue galaxies between z~1 and z~0 they will fade on average by ~1.3 magnitudes in M_B. To fall on local (L-Z) and (M-Z) relationships, these galaxies must increase by a factor of 6-7 in M/L_B between z~1 and z~0, and by factor of two in both stellar mass and metallicity. Emission line diagnostic ratios indicate that the z>1 DEEP2 galaxies in our sample are significantly offset from the excitation sequence observed in nearby HII regions and SDSS emission-line galaxies. This offset implies that physical conditions are different in the HII regions of distant galaxies hosting intense star formation, and may affect the chemical abundances derived from strong-line ratios for such objects (Abridged).

19 pages including 5 figures. Accepted for publication in ApJ

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