Direct determination of oxygen abundances in line emitting star-forming galaxies at intermediate redshift

Abstract

We present a sample of 22 blue ($(B-V{)}_{AB}<0.45$), luminous ($M_{B,AB}<-18.9$), metal-poor galaxies in the $0.69<z<0.88$ redshift range, selected from the DEEP2 galaxy redshift survey. Their spectra contain the $[OIII]\lambda 4363$ auroral line, the $[OII]\lambda \lambda 3726,3729$ doublet and the strong nebular $[OIII]\lambda \lambda 4959,5007$ emission lines. The ionised gas-phase oxygen abundances of these galaxies lie between $7.62<12+\log O/H<8.19$, i.e. between $1/10Z_{\odot }$ and $1/3Z_{\odot }$. We find that galaxies in our sample have comparable metallicities to other intermediate-redshift samples, but are more metal poor than local systems of similar B-band luminosities and star formation activity. The galaxies here show similar properties to the "green peas" discovered at $z\simeq 0.2-0.3$ though our galaxies tend to be slightly less luminous.

Accepted

References in corpus (6)

• I Zw 18 revisited with HST/ACS and Cepheids: New Distance and Age
• Precision abundance analysis of bright HII galaxies
• "Direct" Gas-phase Metallicities, Stellar Properties, and Local Environments of Emission-line Galaxies at Redshift below 0.90
• The mass-metallicity relation of zCOSMOS galaxies at z ~ 0.7, its dependence on SFR, and the existence of massive low-metallicity galaxies
• A Population of Metal-Poor Galaxies with ~L* Luminosities at Intermediate Redshifts
• The nature of [S III]λλ9096, 9532 emitters at z = 1.34 and 1.23

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• Chemical Abundances of a Sample of Oxygen-dominated Galaxies
• Direct Far-Infrared Metal Abundances (FIRA) I: M101